Load Specifications
Bullet:.284 | 140gr | Speer TBBC
Bullet Manufacturer:Speer
Bullet Weight:140 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:7 mm Backcountry load data
Case Length (l3):2.417"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:73 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:20"
Max. allowed Pressure:79,916 psi
Recommended Twist Rate:1:12.0
Load data in caliber 7 mm Backcountry with .284 | 140gr | Speer TBBC bullet and 119 powders. The key underlying parameters are shown in the table above.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 71,823 psi | 90% | 2913 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 71,330 psi | 89% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 68,487 psi | 86% | 2904 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 70,169 psi | 88% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 70,532 psi | 88% | 2986 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,358 psi | 64% | 2776 fps | 97.7% |
| Accurate 4064 | <<locked>> | 92% | 68,255 psi | 85% | 2953 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 70,590 psi | 88% | 3071 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 72,243 psi | 90% | 2894 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 68,342 psi | 86% | 2881 fps | 100% |
| ADI APS 450 | <<locked>> | 92% | 70,895 psi | 89% | 2352 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 71,446 psi | 89% | 3038 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 68,284 psi | 85% | 2989 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,610 psi | 73% | 2933 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 69,604 psi | 87% | 2979 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 68,110 psi | 85% | 2897 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 68,951 psi | 86% | 3051 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 69,473 psi | 87% | 3130 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 58,421 psi | 73% | 2923 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 69,473 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 70,474 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 70,024 psi | 88% | 3038 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 66,007 psi | 83% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 68,966 psi | 86% | 3104 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,551 psi | 72% | 2913 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,109 psi | 60% | 2792 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,259 psi | 69% | 2982 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 68,211 psi | 85% | 2844 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 68,139 psi | 85% | 3012 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 71,504 psi | 89% | 3035 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 69,821 psi | 87% | 3015 fps | 99.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 70,822 psi | 89% | 2956 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 71,069 psi | 89% | 3022 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 69,633 psi | 87% | 3084 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 70,996 psi | 89% | 2969 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 68,095 psi | 85% | 2946 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 71,910 psi | 90% | 3054 fps | 100% |
| Hodgdon H414 | <<locked>> | 98% | 68,342 psi | 86% | 3064 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 98% | 71,939 psi | 90% | 3081 fps | 98.9% |
| Hodgdon H4895 | <<locked>> | 90% | 72,301 psi | 90% | 3048 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 62,424 psi | 78% | 2936 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 68,951 psi | 86% | 3035 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 70,619 psi | 88% | 3123 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 45% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 69,212 psi | 87% | 2999 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 69,082 psi | 86% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 72,084 psi | 90% | 3025 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 71,417 psi | 89% | 3015 fps | 99.5% |
| IMR 4198 | <<locked>> | 84% | 69,169 psi | 87% | 2861 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 66,717 psi | 83% | 2989 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 71,576 psi | 90% | 3041 fps | 99.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 65,659 psi | 82% | 2995 fps | 100% |
| IMR 4895 | <<locked>> | 92% | 71,866 psi | 90% | 3068 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 69,604 psi | 87% | 2979 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 71,504 psi | 89% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 68,385 psi | 86% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 69,589 psi | 87% | 2959 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 72,026 psi | 90% | 3012 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 71,402 psi | 89% | 3028 fps | 99.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 69,024 psi | 86% | 3022 fps | 99.5% |
| Norma 201 | <<locked>> | 90% | 69,836 psi | 87% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 90% | 70,735 psi | 89% | 2972 fps | 100% |
| Norma 203B | <<locked>> | 92% | 69,140 psi | 87% | 3025 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 68,879 psi | 86% | 3054 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 54,389 psi | 68% | 2936 fps | 97.4% |
| Norma URPᴾ | <<locked>> | 100% | 67,820 psi | 85% | 3041 fps | 100% |
| Ramshot Big Game | <<locked>> | 92% | 70,967 psi | 89% | 3054 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 66,935 psi | 84% | 3048 fps | 99.6% |
| Ramshot TAC | <<locked>> | 88% | 70,793 psi | 89% | 3022 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 70,866 psi | 89% | 3031 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 70,808 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 46% | 1821 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 69,227 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 71,678 psi | 90% | 3038 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 67,573 psi | 85% | 3061 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 68,110 psi | 85% | 3094 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 70,285 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 68,995 psi | 86% | 3127 fps | 100% |
| Rottweil R 901 | <<locked>> | 88% | 70,184 psi | 88% | 2949 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 70,329 psi | 88% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 70,967 psi | 89% | 3025 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 60,220 psi | 75% | 2904 fps | 95.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,666 psi | 71% | 2900 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 98% | 69,821 psi | 87% | 3015 fps | 99.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 71,402 psi | 89% | 3028 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 68,385 psi | 86% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 72,026 psi | 90% | 3012 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 69,024 psi | 86% | 3022 fps | 99.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 68,632 psi | 86% | 2936 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 71,388 psi | 89% | 2631 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 68,937 psi | 86% | 3035 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 71,910 psi | 90% | 2943 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 70,053 psi | 88% | 3009 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 70,039 psi | 88% | 3012 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 70,561 psi | 88% | 2904 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 71,649 psi | 90% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 68,081 psi | 85% | 2940 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,159 psi | 70% | 2894 fps | 96.3% |
| Somchem S321 | <<locked>> | 84% | 67,718 psi | 85% | 2966 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 70,010 psi | 88% | 2900 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 69,459 psi | 87% | 2989 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 70,474 psi | 88% | 3015 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 63,106 psi | 79% | 2995 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,493 psi | 72% | 2877 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 86% | 69,517 psi | 87% | 2854 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 70,822 psi | 89% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 70,706 psi | 88% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 71,301 psi | 89% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 68,110 psi | 85% | 2940 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 70,793 psi | 89% | 3045 fps | 100% |
| Vihtavuori N530 | <<locked>> | 88% | 70,895 psi | 89% | 2986 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 69,299 psi | 87% | 2946 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 69,691 psi | 87% | 3048 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,012 psi | 68% | 2877 fps | 99.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 71,663 psi | 90% | 3015 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 72,171 psi | 90% | 3035 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 68,342 psi | 86% | 3064 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,555 psi | 55% | 2825 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 70,764 psi | 89% | 3022 fps | 100% |
Start Load - Barrel Length: 20"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 56,391 psi | 71% | 2726 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 62,381 psi | 78% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 49,588 psi | 62% | 2657 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 57,348 psi | 72% | 2815 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,601 psi | 60% | 2638 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 41,742 psi | 52% | 2598 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,905 psi | 59% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 38,101 psi | 48% | 2543 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 80% | 63,860 psi | 80% | 2799 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 64,411 psi | 81% | 2835 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 58,189 psi | 73% | 2185 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 52,373 psi | 66% | 2772 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 44,454 psi | 56% | 2615 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 54,752 psi | 69% | 2871 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,418 psi | 68% | 2776 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 56,014 psi | 70% | 2753 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 64,542 psi | 81% | 2995 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,820 psi | 61% | 2818 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 51,358 psi | 64% | 2808 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,889 psi | 56% | 2644 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 62,511 psi | 78% | 2815 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,935 psi | 60% | 2710 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 82% | 37,115 psi | 46% | 2546 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,378 psi | 49% | 2621 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,838 psi | 67% | 2851 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 32,750 psi | 41% | 2454 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 38,435 psi | 48% | 2648 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 63,947 psi | 80% | 2795 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,025 psi | 65% | 2779 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 44,904 psi | 56% | 2648 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 48,153 psi | 60% | 2680 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 55,608 psi | 70% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 54,375 psi | 68% | 2802 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 60,437 psi | 76% | 2959 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 62,192 psi | 78% | 2864 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 63,541 psi | 80% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,469 psi | 57% | 2654 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 45,876 psi | 57% | 2707 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 52,301 psi | 65% | 2789 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 52,953 psi | 66% | 2782 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,227 psi | 40% | 2388 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,385 psi | 62% | 2756 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 48,675 psi | 61% | 2789 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 34% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,546 psi | 63% | 2730 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 53,461 psi | 67% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,760 psi | 59% | 2654 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,124 psi | 61% | 2680 fps | 96.4% |
| IMR 4198 | <<locked>> | 80% | 61,902 psi | 77% | 2776 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 48,791 psi | 61% | 2710 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 46,731 psi | 58% | 2654 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 36,521 psi | 46% | 2490 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 49,153 psi | 62% | 2740 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 54,418 psi | 68% | 2776 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 62,526 psi | 78% | 2867 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,446 psi | 66% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,387 psi | 64% | 2703 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 46,920 psi | 59% | 2654 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 41,176 psi | 52% | 2546 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 44,744 psi | 56% | 2635 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 51,227 psi | 64% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,880 psi | 65% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,282 psi | 59% | 2694 fps | 99.2% |
| Norma 204 | <<locked>> | 92% | 52,504 psi | 66% | 2808 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 47,108 psi | 59% | 2802 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 37,855 psi | 47% | 2536 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 47,485 psi | 59% | 2717 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 41,858 psi | 52% | 2631 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 54,360 psi | 68% | 2789 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,404 psi | 68% | 2805 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 58,523 psi | 73% | 2828 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 34% | 1624 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 60,858 psi | 76% | 2854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,513 psi | 57% | 2638 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,459 psi | 64% | 2822 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,872 psi | 52% | 2684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 37,681 psi | 47% | 2552 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 39,566 psi | 50% | 2618 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 55,419 psi | 69% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,849 psi | 61% | 2674 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 42,264 psi | 53% | 2592 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 98% | 56,652 psi | 71% | 2848 fps | 95% |
| Rottweil R 905 | <<locked>> | 98% | 53,214 psi | 67% | 2841 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 48,153 psi | 60% | 2680 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 41,176 psi | 52% | 2546 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,446 psi | 66% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,920 psi | 59% | 2654 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 44,744 psi | 56% | 2635 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 64,339 psi | 81% | 2884 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 64,614 psi | 81% | 2556 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,352 psi | 54% | 2641 fps | 98.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 63,628 psi | 80% | 2848 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,403 psi | 67% | 2772 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,749 psi | 64% | 2740 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,909 psi | 65% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,801 psi | 55% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 46,122 psi | 58% | 2605 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,736 psi | 66% | 2835 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 59,350 psi | 74% | 2858 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 51,866 psi | 65% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,895 psi | 66% | 2762 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 42,801 psi | 54% | 2595 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 31,850 psi | 40% | 2428 fps | 97.1% |
| Somchem S385 | <<locked>> | 94% | 47,311 psi | 59% | 2707 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 58,175 psi | 73% | 2720 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 52,446 psi | 66% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,762 psi | 61% | 2648 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,037 psi | 61% | 2657 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,741 psi | 51% | 2526 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 36,796 psi | 46% | 2484 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 54,708 psi | 68% | 2772 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,500 psi | 59% | 2644 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 38,827 psi | 49% | 2539 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 36,405 psi | 46% | 2536 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,042 psi | 45% | 2457 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 55,332 psi | 69% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 46,122 psi | 58% | 2713 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 31,169 psi | 39% | 2484 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,691 psi | 63% | 2743 fps | 99.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 119 powders for 7 mm Backcountry loaded with the .284 | 140gr | Speer TBBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,130 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (551 MPa), the top charges use 45–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.