Load Specifications
Load data in caliber 8.5 x 63 with .338 | 210gr | Rhino Penetrator bullet and 95 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 CFE223 and ReloadSwiss RS 52.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 55,405 psi | 89% | 2572 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,854 psi | 90% | 2664 fps | 99% |
| Accurate 2460 | <<locked>> | 86% | 53,896 psi | 86% | 2598 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,231 psi | 90% | 2635 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,317 psi | 89% | 2654 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,550 psi | 89% | 2667 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,353 psi | 71% | 2569 fps | 96.8% |
| Accurate LT-30 | <<locked>> | 84% | 55,622 psi | 89% | 2526 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,028 psi | 90% | 2549 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,317 psi | 87% | 2654 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 98% | 55,376 psi | 89% | 2651 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 84% | 56,014 psi | 90% | 2638 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,954 psi | 87% | 2618 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 90% | 53,258 psi | 85% | 2602 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,332 psi | 89% | 2717 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,650 psi | 86% | 2753 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,244 psi | 87% | 2667 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,405 psi | 89% | 2582 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,376 psi | 89% | 2690 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2575 fps | 96.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2726 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,607 psi | 88% | 2526 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,128 psi | 87% | 2671 fps | 98.7% |
| Bofors RP3 | <<locked>> | 98% | 54,708 psi | 88% | 2684 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,275 psi | 90% | 2608 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,086 psi | 90% | 2694 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,273 psi | 87% | 2733 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 86% | 54,462 psi | 87% | 2618 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,724 psi | 89% | 2648 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,362 psi | 90% | 2690 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 92% | 54,795 psi | 88% | 2667 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,756 psi | 65% | 2470 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,374 psi | 86% | 2697 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,577 psi | 55% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 56,304 psi | 90% | 2671 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 53,969 psi | 87% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,752 psi | 88% | 2635 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,927 psi | 90% | 2618 fps | 96.2% |
| IMR 4198 | <<locked>> | 86% | 56,057 psi | 90% | 2546 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,694 psi | 88% | 2631 fps | 95.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,554 psi | 68% | 2520 fps | 96.5% |
| IMR 4895 | <<locked>> | 94% | 53,200 psi | 85% | 2674 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 90% | 53,954 psi | 87% | 2618 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 53,940 psi | 86% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,359 psi | 86% | 2638 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,940 psi | 88% | 2595 fps | 99.4% |
| Lovex S062 | <<locked>> | 96% | 54,288 psi | 87% | 2635 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2572 fps | 96.5% |
| Norma 200 | <<locked>> | 82% | 55,506 psi | 89% | 2559 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,287 psi | 85% | 2608 fps | 99.8% |
| Norma 202 | <<locked>> | 92% | 53,635 psi | 86% | 2618 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,418 psi | 87% | 2677 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 44,541 psi | 71% | 2566 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 96% | 54,853 psi | 88% | 2703 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 54,389 psi | 87% | 2628 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,374 psi | 86% | 2648 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,259 psi | 89% | 2621 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,896 psi | 56% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,635 psi | 86% | 2605 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,679 psi | 86% | 2625 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,071 psi | 88% | 2749 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,056 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,251 psi | 71% | 2589 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 90% | 54,375 psi | 87% | 2598 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,476 psi | 86% | 2602 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2671 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2572 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,359 psi | 86% | 2638 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,288 psi | 87% | 2635 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,708 psi | 86% | 2579 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,927 psi | 90% | 2293 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,347 psi | 90% | 2651 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2733 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,362 psi | 90% | 2598 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,985 psi | 90% | 2657 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,130 psi | 90% | 2677 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,593 psi | 89% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,795 psi | 88% | 2556 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,969 psi | 88% | 2651 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 54,534 psi | 87% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,419 psi | 89% | 2651 fps | 99.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2674 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,581 psi | 63% | 2516 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 88% | 55,550 psi | 89% | 2536 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,434 psi | 89% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,767 psi | 89% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,896 psi | 86% | 2595 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,171 psi | 85% | 2608 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,137 psi | 76% | 2569 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 90% | 54,317 psi | 87% | 2615 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 55,419 psi | 89% | 2635 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2569 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,414 psi | 78% | 2559 fps | 99% |
| Winchester 748 | <<locked>> | 90% | 53,243 psi | 85% | 2661 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,782 psi | 89% | 2684 fps | 99.7% |
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% | 40,857 psi | 66% | 2365 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,315 psi | 84% | 2612 fps | 98.6% |
| Accurate 2460 | <<locked>> | 80% | 44,208 psi | 71% | 2457 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 33,243 psi | 53% | 2277 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,378 psi | 63% | 2408 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 31,444 psi | 50% | 2260 fps | 98.6% |
| Accurate 4350 | <<locked>> | 96% | 38,537 psi | 62% | 2464 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 49,226 psi | 79% | 2441 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,588 psi | 80% | 2461 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,536 psi | 60% | 2365 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 84% | 36,216 psi | 58% | 2320 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 49,095 psi | 79% | 2546 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,523 psi | 63% | 2382 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 38,276 psi | 61% | 2385 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,643 psi | 73% | 2562 fps | 98.8% |
| Alliant Power Pro 2000-MR | 52.9 gr | 84% | 38,566 psi | 62% | 2474 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,879 psi | 50% | 2241 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,325 psi | 74% | 2457 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,563 psi | 57% | 2343 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 96% | 39,595 psi | 63% | 2474 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,679 psi | 56% | 2395 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,935 psi | 77% | 2438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,711 psi | 62% | 2408 fps | 95.3% |
| Bofors RP3 | <<locked>> | 82% | 32,256 psi | 52% | 2287 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,510 psi | 67% | 2379 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,333 psi | 60% | 2388 fps | 98.1% |
| Hodgdon CFE223 | 51.5 gr | 80% | 41,017 psi | 66% | 2507 fps | 96.7% |
| Hodgdon H322 | <<locked>> | 80% | 44,918 psi | 72% | 2480 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,585 psi | 73% | 2503 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,683 psi | 65% | 2441 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 37,811 psi | 61% | 2379 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,924 psi | 54% | 2326 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,736 psi | 54% | 2339 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,628 psi | 41% | 1401 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,318 psi | 58% | 2333 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 36,579 psi | 59% | 2385 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,607 psi | 57% | 2303 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 92% | 52,518 psi | 84% | 2569 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 47,036 psi | 75% | 2425 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 51,401 psi | 82% | 2582 fps | 95.1% |
| IMR 4831 | <<locked>> | 98% | 39,827 psi | 64% | 2470 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 34,214 psi | 55% | 2326 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 39,523 psi | 63% | 2382 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 44,034 psi | 71% | 2461 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 35,650 psi | 57% | 2346 fps | 98.7% |
| Lovex S060 | <<locked>> | 80% | 38,377 psi | 62% | 2316 fps | 96.6% |
| Lovex S062 | <<locked>> | 80% | 33,185 psi | 53% | 2264 fps | 96.4% |
| Lovex S065 | <<locked>> | 96% | 44,309 psi | 71% | 2477 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 52,069 psi | 83% | 2513 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,695 psi | 59% | 2326 fps | 97.5% |
| Norma 202 | <<locked>> | 80% | 36,738 psi | 59% | 2343 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 34,896 psi | 56% | 2333 fps | 95.5% |
| Norma URP | <<locked>> | 96% | 39,334 psi | 63% | 2467 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 84% | 36,941 psi | 59% | 2395 fps | 95.8% |
| Ramshot TAC | <<locked>> | 84% | 44,773 psi | 72% | 2474 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,319 psi | 61% | 2392 fps | 96.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,641 psi | 68% | 2421 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,802 psi | 41% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,324 psi | 71% | 2464 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,094 psi | 76% | 2523 fps | 95% |
| ReloadSwiss RS 52 | 50 gr | 82% | 36,651 psi | 59% | 2428 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,645 psi | 46% | 2244 fps | 95.2% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 41,481 psi | 67% | 2536 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 40,524 psi | 65% | 2379 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 35,056 psi | 56% | 2283 fps | 97% |
| Rottweil R 903 | <<locked>> | 84% | 32,343 psi | 52% | 2283 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 44,309 psi | 71% | 2477 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,650 psi | 57% | 2346 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 33,185 psi | 53% | 2264 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,688 psi | 75% | 2474 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,301 psi | 85% | 2260 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,443 psi | 79% | 2556 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 36,027 psi | 58% | 2382 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,007 psi | 75% | 2474 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 42,554 psi | 68% | 2444 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,969 psi | 58% | 2333 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,493 psi | 62% | 2300 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,531 psi | 51% | 2175 fps | 99% |
| Somchem S321 | <<locked>> | 80% | 42,032 psi | 67% | 2448 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 37,869 psi | 61% | 2303 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 36,811 psi | 59% | 2343 fps | 95.9% |
| Somchem S355 | <<locked>> | 84% | 33,431 psi | 54% | 2293 fps | 95.5% |
| Somchem S365 | <<locked>> | 92% | 30,821 psi | 49% | 2310 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 43,642 psi | 70% | 2372 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,566 psi | 62% | 2303 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,808 psi | 54% | 2280 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,621 psi | 56% | 2280 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 29,791 psi | 48% | 2188 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 96% | 41,394 psi | 66% | 2470 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 39,349 psi | 63% | 2375 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 33,344 psi | 53% | 2267 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 96% | 40,350 psi | 65% | 2470 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,867 psi | 56% | 2306 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 38,189 psi | 61% | 2411 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,027 psi | 56% | 2333 fps | 96.2% |
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 95 powders for 8.5 x 63 loaded with the .338 | 210gr | Rhino Penetrator. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,785 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,785 fps. Accurate 4350 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:15.0 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 with the .338 | 210gr | Rhino Penetrator 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.