Load Specifications
Load data in caliber .300 RCM with .308 | 220gr | Winchester Silvertip 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 Reloder-26, Norma MRP and Accurate High Country.
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 2495 | <<locked>> | 82% | 57,522 psi | 90% | 2444 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,708 psi | 86% | 2477 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2572 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 54,476 psi | 85% | 2454 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,027 psi | 86% | 2562 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 57,711 psi | 90% | 2713 fps | 99% |
| Accurate MAGPRO | <<locked>> | 98% | 54,897 psi | 86% | 2661 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 86% | 57,682 psi | 90% | 2530 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,767 psi | 87% | 2608 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2661 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,637 psi | 57% | 2362 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,188 psi | 90% | 2644 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,767 psi | 87% | 2605 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,056 psi | 86% | 2503 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,216 psi | 87% | 2526 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,898 psi | 88% | 2612 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,145 psi | 90% | 2631 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,042 psi | 86% | 2598 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2657 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,156 psi | 83% | 2582 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,224 psi | 72% | 2536 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,145 psi | 90% | 2720 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2589 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 56,014 psi | 88% | 2523 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2467 fps | 96.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2657 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 55,172 psi | 86% | 2516 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,687 psi | 72% | 2480 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 84% | 56,318 psi | 88% | 2543 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,043 psi | 89% | 2612 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 56,855 psi | 89% | 2575 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,188 psi | 90% | 2608 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,028 psi | 88% | 2592 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,086 psi | 88% | 2539 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,464 psi | 90% | 2566 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,063 psi | 71% | 2572 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 90% | 57,508 psi | 90% | 2654 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 57% | 1542 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,058 psi | 89% | 2510 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,970 psi | 88% | 2503 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 56,231 psi | 88% | 2552 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,811 psi | 89% | 2539 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 55,405 psi | 87% | 2552 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,623 psi | 89% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,100 psi | 86% | 2543 fps | 97.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2641 fps | 98.4% |
| Lovex S062 | <<locked>> | 84% | 57,290 psi | 90% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,000 psi | 89% | 2536 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,839 psi | 86% | 2533 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,036 psi | 74% | 2444 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 54,534 psi | 85% | 2513 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,956 psi | 89% | 2602 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 55,680 psi | 87% | 2680 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 57,377 psi | 90% | 2595 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,187 psi | 86% | 2536 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,897 psi | 86% | 2654 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 55,927 psi | 88% | 2602 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,907 psi | 77% | 2539 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 59% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,854 psi | 88% | 2526 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,768 psi | 89% | 2621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,940 psi | 86% | 2589 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,884 psi | 89% | 2661 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,136 psi | 71% | 2572 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,782 psi | 87% | 2467 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,173 psi | 88% | 2520 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,508 psi | 90% | 2582 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 96% | 54,549 psi | 85% | 2589 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 55,172 psi | 86% | 2516 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,000 psi | 89% | 2536 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,290 psi | 90% | 2503 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,839 psi | 86% | 2533 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,696 psi | 90% | 2575 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,826 psi | 89% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,376 psi | 88% | 2493 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,566 psi | 90% | 2631 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 56,028 psi | 88% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,506 psi | 87% | 2530 fps | 97.8% |
| Somchem S365 | <<locked>> | 94% | 56,724 psi | 89% | 2592 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,056 psi | 86% | 2562 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 56,478 psi | 89% | 2428 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,318 psi | 88% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,087 psi | 89% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,724 psi | 87% | 2539 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,331 psi | 85% | 2543 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 54,665 psi | 86% | 2448 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,926 psi | 86% | 2549 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,811 psi | 87% | 2608 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,912 psi | 88% | 2674 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,819 psi | 75% | 2543 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,187 psi | 86% | 2510 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,348 psi | 90% | 2615 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,187 psi | 86% | 2562 fps | 99.2% |
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 2495 | <<locked>> | 80% | 53,853 psi | 84% | 2402 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,372 psi | 81% | 2428 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 28,906 psi | 45% | 2093 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 51,082 psi | 80% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,233 psi | 61% | 2320 fps | 99.6% |
| Accurate High Country | 58.6 gr | 88% | 40,988 psi | 64% | 2441 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 92% | 44,440 psi | 70% | 2493 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,877 psi | 75% | 2395 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,898 psi | 59% | 2306 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 40,944 psi | 64% | 2392 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 32,474 psi | 51% | 2260 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,505 psi | 84% | 2598 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,072 psi | 60% | 2310 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,689 psi | 76% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,779 psi | 81% | 2480 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,101 psi | 60% | 2329 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,163 psi | 68% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,695 psi | 59% | 2303 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 35,505 psi | 56% | 2300 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,021 psi | 44% | 2123 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,963 psi | 44% | 2133 fps | 95.1% |
| Alliant Reloder-26 | 54.9 gr | 80% | 29,950 psi | 47% | 2228 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 37,420 psi | 59% | 2339 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 49,124 psi | 77% | 2431 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,349 psi | 62% | 2415 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 35,505 psi | 56% | 2300 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 43,091 psi | 68% | 2329 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 39,972 psi | 63% | 2372 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 49,487 psi | 78% | 2448 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,205 psi | 65% | 2365 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 44,048 psi | 69% | 2379 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 43,830 psi | 69% | 2402 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,917 psi | 67% | 2385 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,781 psi | 56% | 2231 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,896 psi | 84% | 2520 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 35,041 psi | 55% | 2352 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 40,001 psi | 63% | 2379 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 43% | 1375 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,386 psi | 79% | 2421 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,518 psi | 82% | 2454 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 38,740 psi | 61% | 2267 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,396 psi | 70% | 2352 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 37,681 psi | 59% | 2277 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 53,142 psi | 83% | 2500 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,989 psi | 67% | 2349 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 41,974 psi | 66% | 2428 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,923 psi | 80% | 2421 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,974 psi | 66% | 2310 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 40,321 psi | 63% | 2297 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 28,442 psi | 45% | 2080 fps | 95% |
| Norma 203B | <<locked>> | 80% | 51,140 psi | 80% | 2467 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,116 psi | 60% | 2293 fps | 95.6% |
| Norma MRP | 54.6 gr | 82% | 32,329 psi | 51% | 2254 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 39,030 psi | 61% | 2316 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,779 psi | 81% | 2493 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,423 psi | 65% | 2428 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 37,739 psi | 59% | 2306 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 34,345 psi | 54% | 2267 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 44% | 1407 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,284 psi | 77% | 2431 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,847 psi | 72% | 2474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,044 psi | 61% | 2339 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,739 psi | 59% | 2349 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,272 psi | 54% | 2336 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 52,591 psi | 82% | 2428 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,340 psi | 73% | 2385 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,989 psi | 66% | 2339 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 36,825 psi | 58% | 2287 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 43,091 psi | 68% | 2329 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,974 psi | 66% | 2310 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 50,923 psi | 80% | 2421 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,321 psi | 63% | 2297 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,369 psi | 74% | 2434 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,413 psi | 74% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,176 psi | 65% | 2264 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,477 psi | 57% | 2283 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,427 psi | 73% | 2382 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,571 psi | 71% | 2379 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 35,563 psi | 56% | 2280 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,837 psi | 51% | 2175 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 53,156 psi | 83% | 2388 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,098 psi | 83% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,440 psi | 70% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,292 psi | 63% | 2310 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 34,505 psi | 54% | 2211 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 51,329 psi | 80% | 2405 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,856 psi | 62% | 2316 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 31,067 psi | 49% | 2188 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 90% | 42,757 psi | 67% | 2457 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 41,829 psi | 66% | 2438 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,262 psi | 62% | 2280 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,205 psi | 65% | 2365 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,772 psi | 39% | 2113 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,521 psi | 57% | 2257 fps | 95.2% |
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 94 powders for .300 RCM loaded with the .308 | 220gr | Winchester Silvertip. Alliant Reloder-26 delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,720 fps. Accurate 3100 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 (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.308" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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-26, Norma MRP, Accurate High Country rank at the top here: for .300 RCM with the .308 | 220gr | Winchester Silvertip 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.