Load Specifications
Load data in caliber 8.5 x 63 with .338 | 215gr | Sierra GameKing bullet and 94 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, ReloadSwiss RS 52 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.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 53,969 psi | 87% | 2533 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,999 psi | 90% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,868 psi | 88% | 2592 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,911 psi | 86% | 2612 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 54,288 psi | 87% | 2625 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,383 psi | 74% | 2582 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 53,795 psi | 86% | 2480 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,201 psi | 87% | 2503 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,347 psi | 90% | 2661 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 53,751 psi | 86% | 2608 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 54,259 psi | 87% | 2592 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,622 psi | 89% | 2618 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,405 psi | 89% | 2598 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,737 psi | 86% | 2667 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,782 psi | 89% | 2766 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,289 psi | 90% | 2674 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,085 psi | 87% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,911 psi | 86% | 2648 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,209 psi | 74% | 2589 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,374 psi | 86% | 2733 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,028 psi | 90% | 2520 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 56,086 psi | 90% | 2677 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 53,272 psi | 85% | 2641 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,462 psi | 87% | 2562 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,360 psi | 87% | 2648 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 52,649 psi | 84% | 2684 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 56,289 psi | 90% | 2618 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,027 psi | 87% | 2602 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 55,042 psi | 88% | 2654 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 90% | 53,403 psi | 86% | 2625 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,337 psi | 68% | 2480 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,434 psi | 89% | 2700 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,722 psi | 56% | 1562 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,694 psi | 88% | 2628 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 55,985 psi | 90% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,229 psi | 85% | 2592 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,983 psi | 87% | 2572 fps | 96.2% |
| IMR 4198 | <<locked>> | 84% | 54,331 psi | 87% | 2500 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2638 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,411 psi | 71% | 2533 fps | 97.3% |
| IMR 4895 | <<locked>> | 94% | 55,259 psi | 89% | 2677 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 55,622 psi | 89% | 2618 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 56,014 psi | 90% | 2612 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,550 psi | 89% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 53,127 psi | 85% | 2549 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 56,014 psi | 90% | 2638 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,808 psi | 83% | 2579 fps | 97.3% |
| Norma 201 | <<locked>> | 92% | 55,042 psi | 88% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,434 psi | 89% | 2615 fps | 100% |
| Norma 203B | <<locked>> | 94% | 53,055 psi | 85% | 2638 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2575 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 94% | 53,374 psi | 86% | 2661 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 56,144 psi | 90% | 2635 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,288 psi | 89% | 2654 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,534 psi | 86% | 2575 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,085 psi | 56% | 1601 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,376 psi | 89% | 2605 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,535 psi | 89% | 2635 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,722 psi | 86% | 2707 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,432 psi | 86% | 2743 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,282 psi | 74% | 2602 fps | 97.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,326 psi | 76% | 2618 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 90% | 56,144 psi | 90% | 2598 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,419 psi | 89% | 2608 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2677 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,808 psi | 83% | 2579 fps | 97.3% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,550 psi | 89% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 56,014 psi | 90% | 2638 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,332 psi | 89% | 2582 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,665 psi | 88% | 2605 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,882 psi | 88% | 2690 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,955 psi | 88% | 2556 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 54,099 psi | 87% | 2608 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,665 psi | 88% | 2635 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,969 psi | 87% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,490 psi | 86% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2536 fps | 95.8% |
| Somchem S321 | <<locked>> | 86% | 53,272 psi | 85% | 2605 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 56,144 psi | 90% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,577 psi | 86% | 2605 fps | 99.4% |
| Somchem S355 | <<locked>> | 98% | 53,650 psi | 86% | 2631 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,394 psi | 66% | 2533 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 53,795 psi | 86% | 2490 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,954 psi | 87% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,404 psi | 87% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,941 psi | 90% | 2595 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2612 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,965 psi | 79% | 2579 fps | 97.9% |
| Vihtavuori N530 | <<locked>> | 90% | 56,289 psi | 90% | 2621 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,896 psi | 86% | 2592 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,921 psi | 77% | 2582 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2572 fps | 99.5% |
| Winchester 748 | <<locked>> | 90% | 55,376 psi | 89% | 2664 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,288 psi | 87% | 2641 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 42,206 psi | 68% | 2362 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,861 psi | 74% | 2457 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,795 psi | 56% | 2287 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,973 psi | 66% | 2415 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 32,924 psi | 53% | 2270 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 37,695 psi | 60% | 2428 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 50,488 psi | 81% | 2438 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,879 psi | 82% | 2457 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,725 psi | 62% | 2372 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 35,215 psi | 56% | 2280 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 50,821 psi | 81% | 2546 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,770 psi | 65% | 2385 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 39,784 psi | 64% | 2385 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,166 psi | 76% | 2566 fps | 99.2% |
| Alliant Power Pro 2000-MR | 52.4 gr | 82% | 37,246 psi | 60% | 2428 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,068 psi | 51% | 2251 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,805 psi | 77% | 2454 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,664 psi | 56% | 2303 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,580 psi | 62% | 2438 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,692 psi | 54% | 2356 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,574 psi | 79% | 2438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,666 psi | 60% | 2369 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 31,343 psi | 50% | 2247 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,888 psi | 69% | 2382 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,798 psi | 62% | 2395 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,554 psi | 68% | 2516 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 80% | 46,354 psi | 74% | 2480 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,181 psi | 76% | 2503 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 39,566 psi | 63% | 2398 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 39,015 psi | 63% | 2382 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,156 psi | 53% | 2290 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,824 psi | 56% | 2343 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 42% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,492 psi | 60% | 2336 fps | 97.2% |
| IMR 3031 | <<locked>> | 80% | 38,058 psi | 61% | 2388 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,606 psi | 55% | 2264 fps | 95.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,734 psi | 81% | 2523 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,211 psi | 77% | 2418 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,908 psi | 80% | 2539 fps | 95.2% |
| IMR 4831 | <<locked>> | 94% | 36,492 psi | 59% | 2382 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 35,433 psi | 57% | 2333 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,770 psi | 65% | 2385 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 45,629 psi | 73% | 2464 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 37,188 psi | 60% | 2356 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,450 psi | 63% | 2320 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 34,360 psi | 55% | 2270 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 43,236 psi | 69% | 2441 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 38,116 psi | 61% | 2333 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 38,000 psi | 61% | 2346 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 34,040 psi | 55% | 2293 fps | 95.6% |
| Norma URP | <<locked>> | 94% | 38,392 psi | 62% | 2431 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 82% | 35,723 psi | 57% | 2352 fps | 95.9% |
| Ramshot TAC | <<locked>> | 82% | 43,468 psi | 70% | 2434 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,726 psi | 64% | 2398 fps | 97.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,019 psi | 71% | 2428 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,092 psi | 42% | 1430 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,614 psi | 73% | 2464 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 45,861 psi | 74% | 2484 fps | 95.1% |
| ReloadSwiss RS 52 | 49.6 gr | 80% | 35,723 psi | 57% | 2388 fps | 95.5% |
| ReloadSwiss RS 60 | 50.3 gr | 80% | 29,544 psi | 47% | 2257 fps | 96.4% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 40,466 psi | 65% | 2497 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 44,179 psi | 71% | 2559 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 41,814 psi | 67% | 2382 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 36,245 psi | 58% | 2290 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 31,589 psi | 51% | 2244 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 43,236 psi | 69% | 2441 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,188 psi | 60% | 2356 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,360 psi | 55% | 2270 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,225 psi | 77% | 2480 fps | 99.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 51,111 psi | 82% | 2552 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,882 psi | 56% | 2339 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,515 psi | 78% | 2470 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,321 psi | 66% | 2405 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,333 psi | 60% | 2343 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,697 psi | 64% | 2303 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,605 psi | 52% | 2178 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,733 psi | 78% | 2487 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 43,772 psi | 70% | 2461 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 39,247 psi | 63% | 2306 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 38,348 psi | 61% | 2356 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 32,590 psi | 52% | 2251 fps | 95.6% |
| Somchem S365 | <<locked>> | 90% | 30,197 psi | 48% | 2277 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 44,962 psi | 72% | 2369 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,798 psi | 64% | 2303 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,128 psi | 56% | 2283 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,998 psi | 58% | 2287 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,080 psi | 47% | 2152 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 37,869 psi | 61% | 2382 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 40,611 psi | 65% | 2379 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 34,461 psi | 55% | 2274 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 39,421 psi | 63% | 2434 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,794 psi | 54% | 2270 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 39,552 psi | 63% | 2415 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,347 psi | 58% | 2343 fps | 97% |
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 94 powders for 8.5 x 63 loaded with the .338 | 215gr | Sierra GameKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,766 fps; across all powders the maximum-charge window runs from 1,562 fps to 2,766 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 215.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 52, ReloadSwiss RS 60 rank at the top here: for 8.5 x 63 with the .338 | 215gr | Sierra GameKing 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.