Load Specifications
Bullet:.284 | 155gr | Geco EXPRESS
Bullet Manufacturer:Geco
Bullet Weight:155 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.284 Win. load data
Case Length (l3):2.17"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:66 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:11.0
Load data in caliber .284 Win. with .284 | 155gr | Geco EXPRESS bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 57,246 psi | 90% | 2635 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,565 psi | 89% | 2667 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,347 psi | 88% | 2717 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 56,347 psi | 88% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,347 psi | 88% | 2680 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,207 psi | 68% | 2582 fps | 97.2% |
| Accurate 4064 | <<locked>> | 90% | 56,246 psi | 88% | 2710 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,362 psi | 88% | 2805 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 56,478 psi | 89% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,508 psi | 90% | 2746 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,865 psi | 80% | 2726 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,434 psi | 87% | 2694 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,623 psi | 89% | 2664 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,159 psi | 88% | 2861 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,696 psi | 90% | 2766 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,621 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2858 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,955 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,864 psi | 78% | 2717 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,089 psi | 64% | 2612 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,035 psi | 72% | 2772 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,217 psi | 88% | 2762 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 54,723 psi | 86% | 2733 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,810 psi | 86% | 2710 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,869 psi | 89% | 2671 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,969 psi | 86% | 2726 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,884 psi | 89% | 2822 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,579 psi | 87% | 2746 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 55,506 psi | 87% | 2805 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 55,956 psi | 88% | 2762 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 86% | 57,043 psi | 89% | 2753 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,766 psi | 84% | 2736 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,637 psi | 89% | 2785 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,956 psi | 88% | 2841 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 56% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,853 psi | 86% | 2707 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,188 psi | 90% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,000 psi | 89% | 2730 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,927 psi | 89% | 2713 fps | 98.7% |
| IMR 4350 | <<locked>> | 98% | 54,984 psi | 86% | 2733 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,623 psi | 89% | 2740 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2795 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,028 psi | 88% | 2766 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,434 psi | 87% | 2694 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,347 psi | 88% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,782 psi | 87% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,927 psi | 89% | 2723 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,985 psi | 88% | 2730 fps | 99.4% |
| Lovex S070 | <<locked>> | 98% | 57,203 psi | 90% | 2769 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 55,376 psi | 87% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,825 psi | 87% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,290 psi | 90% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,622 psi | 87% | 2782 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 45,905 psi | 72% | 2730 fps | 96.8% |
| Norma URP | <<locked>> | 98% | 55,332 psi | 87% | 2792 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 54,331 psi | 85% | 2749 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,667 psi | 90% | 2844 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 55,492 psi | 87% | 2717 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,303 psi | 87% | 2733 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,231 psi | 88% | 2697 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,405 psi | 57% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,941 psi | 88% | 2733 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,187 psi | 86% | 2802 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,563 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,043 psi | 88% | 2828 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,477 psi | 87% | 2858 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 56,362 psi | 88% | 2671 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,709 psi | 87% | 2687 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,563 psi | 86% | 2723 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2697 fps | 96% |
| Rottweil R 907 | <<locked>> | 94% | 54,810 psi | 86% | 2710 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,985 psi | 88% | 2730 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,347 psi | 88% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,927 psi | 89% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,203 psi | 90% | 2769 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,478 psi | 89% | 2785 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,157 psi | 85% | 2697 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,795 psi | 86% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,492 psi | 89% | 2625 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,855 psi | 89% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,405 psi | 88% | 2687 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,109 psi | 75% | 2694 fps | 95.9% |
| Somchem S321 | <<locked>> | 82% | 56,492 psi | 89% | 2723 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,173 psi | 88% | 2628 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,334 psi | 90% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,853 psi | 86% | 2720 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,098 psi | 83% | 2789 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,501 psi | 78% | 2684 fps | 97% |
| Vihtavuori N130 | <<locked>> | 82% | 56,289 psi | 88% | 2585 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,797 psi | 89% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,695 psi | 87% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,173 psi | 88% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,608 psi | 89% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,201 psi | 85% | 2736 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 56,043 psi | 88% | 2697 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,491 psi | 85% | 2667 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,739 psi | 89% | 2792 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,382 psi | 71% | 2684 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,186 psi | 85% | 2713 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,086 psi | 88% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,506 psi | 87% | 2805 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,898 psi | 58% | 2628 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,839 psi | 86% | 2726 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% | 50,792 psi | 80% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,627 psi | 68% | 2487 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,298 psi | 77% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,298 psi | 77% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 43,308 psi | 68% | 2470 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 37,768 psi | 59% | 2477 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,278 psi | 65% | 2487 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,605 psi | 51% | 2379 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 46,949 psi | 74% | 2598 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,929 psi | 63% | 2454 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 47,732 psi | 75% | 2674 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,023 psi | 77% | 2598 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,559 psi | 78% | 2575 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,728 psi | 67% | 2635 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,653 psi | 62% | 2477 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,598 psi | 67% | 2539 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,806 psi | 48% | 2336 fps | 95% |
| Alliant Reloder-17 | 42.6 gr | 80% | 34,171 psi | 54% | 2454 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 46,876 psi | 73% | 2664 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,543 psi | 45% | 2306 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,925 psi | 55% | 2530 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,282 psi | 73% | 2605 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 39,407 psi | 62% | 2484 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 42,786 psi | 67% | 2507 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,401 psi | 79% | 2582 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,935 psi | 75% | 2621 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,069 psi | 83% | 2766 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,016 psi | 63% | 2484 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 39,682 psi | 62% | 2530 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 46,253 psi | 72% | 2608 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,442 psi | 74% | 2608 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,224 psi | 44% | 2241 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,482 psi | 68% | 2585 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,090 psi | 66% | 2598 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 42% | 1473 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,252 psi | 71% | 2559 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 47,282 psi | 74% | 2595 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,930 psi | 66% | 2487 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,367 psi | 70% | 2510 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 42,989 psi | 67% | 2533 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,800 psi | 66% | 2490 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 31,575 psi | 49% | 2339 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 43,642 psi | 68% | 2569 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,023 psi | 77% | 2598 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,253 psi | 72% | 2575 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,746 psi | 73% | 2533 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 41,989 psi | 66% | 2490 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,680 psi | 57% | 2392 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 39,262 psi | 62% | 2464 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 45,963 psi | 72% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,296 psi | 73% | 2552 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,003 psi | 66% | 2530 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 48,617 psi | 76% | 2671 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 40,190 psi | 63% | 2612 fps | 95% |
| Norma URP | <<locked>> | 82% | 32,808 psi | 51% | 2379 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 41,495 psi | 65% | 2539 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 36,419 psi | 57% | 2464 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 48,660 psi | 76% | 2612 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,356 psi | 76% | 2628 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,649 psi | 83% | 2648 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,495 psi | 63% | 2470 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,107 psi | 71% | 2641 fps | 99.4% |
| ReloadSwiss RS 60 | 42.6 gr | 80% | 36,347 psi | 57% | 2513 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,343 psi | 51% | 2392 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 34,548 psi | 54% | 2451 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 49,850 psi | 78% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,700 psi | 68% | 2503 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,101 psi | 58% | 2428 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 45,469 psi | 71% | 2644 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 42,786 psi | 67% | 2507 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,680 psi | 57% | 2392 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,253 psi | 72% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,989 psi | 66% | 2490 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,262 psi | 62% | 2464 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,058 psi | 60% | 2477 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,166 psi | 74% | 2589 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,324 psi | 71% | 2569 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,978 psi | 74% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,233 psi | 61% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,828 psi | 64% | 2434 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,049 psi | 71% | 2638 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 53,185 psi | 83% | 2677 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,818 psi | 73% | 2497 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,094 psi | 74% | 2585 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 37,927 psi | 59% | 2434 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 27,543 psi | 43% | 2280 fps | 97.1% |
| Somchem S385 | <<locked>> | 96% | 43,294 psi | 68% | 2575 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 52,881 psi | 83% | 2543 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,355 psi | 74% | 2480 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,221 psi | 68% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,801 psi | 69% | 2490 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,984 psi | 56% | 2372 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 32,198 psi | 50% | 2329 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 49,095 psi | 77% | 2595 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,090 psi | 66% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,808 psi | 53% | 2382 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 30,560 psi | 48% | 2372 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,894 psi | 50% | 2310 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 49,124 psi | 77% | 2641 fps | 100% |
| Winchester 760 | 44.9 gr | 86% | 39,943 psi | 63% | 2536 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,543 psi | 45% | 2382 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,976 psi | 70% | 2575 fps | 99.8% |
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 103 powders for .284 Win. loaded with the .284 | 155gr | Geco EXPRESS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,861 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .284 Win. with the .284 | 155gr | Geco EXPRESS 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.