Load Specifications
Load data in caliber 7 mm Rem. SA Ultra Mag. with .284 | 125gr | Lehigh Defense Controlled Chaos bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance and ReloadSwiss RS 60.
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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 56,405 psi | 87% | 2995 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,479 psi | 90% | 3074 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,332 psi | 85% | 3018 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,130 psi | 88% | 3087 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 58,073 psi | 89% | 3071 fps | 97.2% |
| Accurate 4064 | <<locked>> | 90% | 55,463 psi | 85% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,376 psi | 85% | 3153 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 55,680 psi | 86% | 3100 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,855 psi | 87% | 3100 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,131 psi | 89% | 3104 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,347 psi | 85% | 3025 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,477 psi | 85% | 3225 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,971 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,522 psi | 88% | 3150 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3215 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,320 psi | 90% | 3258 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,495 psi | 62% | 2923 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,629 psi | 70% | 3097 fps | 98% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,593 psi | 86% | 3114 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 57,841 psi | 89% | 3143 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,580 psi | 89% | 3107 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,086 psi | 86% | 3031 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,754 psi | 89% | 3133 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,014 psi | 86% | 3186 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 58,610 psi | 90% | 3094 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 58,798 psi | 90% | 3156 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 58,494 psi | 90% | 3209 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 55,288 psi | 85% | 3110 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 86% | 56,289 psi | 87% | 3114 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,852 psi | 81% | 3081 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,782 psi | 86% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,448 psi | 85% | 3186 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 55% | 1916 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,450 psi | 88% | 3114 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,115 psi | 86% | 3094 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,188 psi | 86% | 3084 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,086 psi | 86% | 3058 fps | 97.6% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,914 psi | 89% | 3130 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,985 psi | 86% | 3087 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 3146 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 55,361 psi | 85% | 3127 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 58,131 psi | 89% | 3104 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 58,740 psi | 90% | 3091 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,434 psi | 85% | 3074 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,320 psi | 90% | 3074 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,028 psi | 86% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,390 psi | 85% | 3077 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 56,391 psi | 87% | 3114 fps | 97.9% |
| Norma 201 | <<locked>> | 88% | 57,769 psi | 89% | 3097 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,407 psi | 90% | 3097 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,681 psi | 87% | 3136 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 58,117 psi | 89% | 3196 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 57,493 psi | 88% | 3159 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,014 psi | 88% | 3192 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 58,595 psi | 90% | 3127 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 58,334 psi | 90% | 3143 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,419 psi | 85% | 3048 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 55% | 1962 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,290 psi | 88% | 3081 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,100 psi | 85% | 3074 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 58,218 psi | 90% | 3222 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 57,812 psi | 89% | 3255 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,129 psi | 85% | 3173 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 3268 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 86% | 58,653 psi | 90% | 3077 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 58,247 psi | 90% | 3094 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,377 psi | 88% | 3130 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,580 psi | 89% | 3107 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,390 psi | 85% | 3077 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,434 psi | 85% | 3074 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,028 psi | 86% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,391 psi | 87% | 3114 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,796 psi | 86% | 3143 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,072 psi | 88% | 3100 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,740 psi | 89% | 3123 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,782 psi | 86% | 2982 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,202 psi | 86% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,796 psi | 86% | 3028 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 55,811 psi | 86% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,508 psi | 90% | 3025 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,710 psi | 87% | 3091 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,537 psi | 89% | 3127 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,475 psi | 81% | 3140 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 55,332 psi | 85% | 2943 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,043 psi | 86% | 2966 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,044 psi | 89% | 3054 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,463 psi | 85% | 3022 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,506 psi | 85% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,884 psi | 88% | 3136 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 58,653 psi | 90% | 3104 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,130 psi | 88% | 3068 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,014 psi | 86% | 3140 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,773 psi | 69% | 3009 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,435 psi | 88% | 3114 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,027 psi | 85% | 3097 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 58,494 psi | 90% | 3209 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,434 psi | 56% | 2920 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,653 psi | 89% | 3133 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 49,806 psi | 77% | 2897 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,839 psi | 84% | 3022 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,757 psi | 66% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,893 psi | 77% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,894 psi | 78% | 2949 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 40,437 psi | 62% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 36,579 psi | 56% | 2785 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 46,006 psi | 71% | 2930 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 39,131 psi | 60% | 2766 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,109 psi | 74% | 2940 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,501 psi | 75% | 2923 fps | 100% |
| Alliant Power Pro 2000-MR | 50.9 gr | 80% | 41,945 psi | 65% | 2956 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,827 psi | 60% | 2789 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,713 psi | 64% | 2858 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,376 psi | 56% | 2795 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,547 psi | 52% | 2746 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,662 psi | 49% | 2687 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 36,927 psi | 57% | 2887 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,281 psi | 70% | 2930 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 38,595 psi | 59% | 2792 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 47,761 psi | 73% | 2933 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,806 psi | 77% | 2930 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,123 psi | 72% | 2959 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,156 psi | 80% | 3117 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 54,911 psi | 84% | 3041 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,320 psi | 60% | 2792 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 90% | 44,759 psi | 69% | 2963 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 51,880 psi | 80% | 3048 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 46,456 psi | 71% | 2943 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,357 psi | 48% | 2625 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,511 psi | 65% | 2907 fps | 99.2% |
| Hodgdon Superformance | 60.9 gr | 92% | 47,819 psi | 74% | 3045 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 41% | 1716 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,411 psi | 68% | 2887 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 46,282 psi | 71% | 2940 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,046 psi | 63% | 2802 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 82% | 46,456 psi | 71% | 2884 fps | 95.5% |
| IMR 4350 | <<locked>> | 94% | 48,124 psi | 74% | 2963 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,412 psi | 71% | 2910 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 35,230 psi | 54% | 2733 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 42,728 psi | 66% | 2890 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 48,109 psi | 74% | 2940 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 54,781 psi | 84% | 3031 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,223 psi | 70% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,847 psi | 71% | 2861 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 41,046 psi | 63% | 2808 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 40,785 psi | 63% | 2799 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 43,903 psi | 68% | 2884 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 45,179 psi | 70% | 2881 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 45,368 psi | 70% | 2887 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,075 psi | 63% | 2844 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 36,651 psi | 56% | 2782 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 40,712 psi | 63% | 2858 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 43,801 psi | 67% | 2949 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 47,979 psi | 74% | 2943 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,747 psi | 73% | 2966 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,808 psi | 80% | 2989 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 41% | 1755 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,766 psi | 83% | 3025 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,569 psi | 65% | 2838 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,193 psi | 68% | 2972 fps | 98.3% |
| ReloadSwiss RS 60 | 50.1 gr | 80% | 35,708 psi | 55% | 2822 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,216 psi | 56% | 2799 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,827 psi | 60% | 2867 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 49,023 psi | 75% | 2923 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,946 psi | 66% | 2828 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 36,361 psi | 56% | 2733 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 47,761 psi | 73% | 2933 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,785 psi | 63% | 2799 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,223 psi | 70% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,046 psi | 63% | 2808 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 43,903 psi | 68% | 2884 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,333 psi | 57% | 2785 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,528 psi | 72% | 2917 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,614 psi | 69% | 2897 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,296 psi | 71% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,595 psi | 59% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,847 psi | 71% | 2854 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 52,127 psi | 80% | 3022 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,050 psi | 71% | 2831 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,079 psi | 71% | 2910 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 37,144 psi | 57% | 2743 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 28,776 psi | 44% | 2605 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 52,141 psi | 80% | 2894 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,630 psi | 72% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,424 psi | 65% | 2812 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,062 psi | 66% | 2818 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,317 psi | 54% | 2671 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 35,911 psi | 55% | 2730 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 48,196 psi | 74% | 2933 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 41,408 psi | 64% | 2802 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 37,811 psi | 58% | 2785 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 34,258 psi | 53% | 2772 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,256 psi | 48% | 2582 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 48,022 psi | 74% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,759 psi | 69% | 2963 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,894 psi | 49% | 2772 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,106 psi | 68% | 2900 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 98 powders for 7 mm Rem. SA Ultra Mag. loaded with the .284 | 125gr | Lehigh Defense Controlled Chaos. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,268 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for 7 mm Rem. SA Ultra Mag. with the .284 | 125gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.