Load Specifications
Load data in caliber 7.62 x 53 R Fin. with .310 | 200gr | Rhino Penetrator bullet and 96 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 60 and Alliant Reloder-17.
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: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 50,705 psi | 90% | 2385 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 48,936 psi | 87% | 2408 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 51,184 psi | 90% | 2441 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 50,183 psi | 89% | 2461 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 51,010 psi | 90% | 2484 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,195 psi | 82% | 2497 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 88% | 49,792 psi | 88% | 2474 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 50,662 psi | 90% | 2470 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 49,226 psi | 87% | 2434 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 48,791 psi | 86% | 2411 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 48,559 psi | 86% | 2566 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 49,617 psi | 88% | 2487 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 50,865 psi | 90% | 2392 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 50,488 psi | 89% | 2507 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,166 psi | 82% | 2503 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 98% | 49,806 psi | 88% | 2589 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,561 psi | 58% | 2270 fps | 97% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 49,081 psi | 87% | 2484 fps | 99.2% |
| Bofors RP3 | <<locked>> | 94% | 49,734 psi | 88% | 2500 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 51,068 psi | 90% | 2467 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 48,138 psi | 85% | 2375 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 50,676 psi | 90% | 2500 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 48,791 psi | 86% | 2536 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 49,676 psi | 88% | 2428 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 50,343 psi | 89% | 2451 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 47,906 psi | 85% | 2461 fps | 98.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,821 psi | 88% | 2543 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 88% | 50,183 psi | 89% | 2484 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,264 psi | 75% | 2398 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 48,617 psi | 86% | 2510 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 51,039 psi | 90% | 2572 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 61% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 48,124 psi | 85% | 2438 fps | 99.8% |
| IMR 3031 | <<locked>> | 88% | 49,313 psi | 87% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 50,169 psi | 89% | 2454 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,720 psi | 90% | 2434 fps | 97% |
| IMR 4350ᴾ | <<locked>> | 100% | 47,587 psi | 84% | 2441 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,719 psi | 88% | 2451 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,208 psi | 78% | 2448 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 48,646 psi | 86% | 2490 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 49,226 psi | 87% | 2434 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 48,863 psi | 86% | 2418 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 48,443 psi | 86% | 2451 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 50,198 psi | 89% | 2411 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 49,676 psi | 88% | 2454 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 48,544 psi | 86% | 2444 fps | 98% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,892 psi | 86% | 2470 fps | 97.1% |
| Norma 201 | <<locked>> | 88% | 48,660 psi | 86% | 2425 fps | 100% |
| Norma 202 | <<locked>> | 88% | 48,834 psi | 86% | 2428 fps | 100% |
| Norma 203B | <<locked>> | 92% | 49,647 psi | 88% | 2493 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 46,238 psi | 82% | 2490 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 92% | 49,705 psi | 88% | 2516 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,542 psi | 81% | 2484 fps | 97.1% |
| Ramshot TAC | <<locked>> | 86% | 49,400 psi | 87% | 2444 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 48,443 psi | 86% | 2464 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 84% | 49,937 psi | 88% | 2431 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,041 psi | 62% | 1516 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 48,892 psi | 86% | 2418 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,602 psi | 86% | 2444 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 50,241 psi | 89% | 2562 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 49,617 psi | 88% | 2592 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,905 psi | 81% | 2516 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,065 psi | 83% | 2536 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 86% | 50,009 psi | 88% | 2411 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 48,950 psi | 87% | 2421 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 49,617 psi | 88% | 2490 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 51,068 psi | 90% | 2467 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 48,544 psi | 86% | 2444 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 88% | 48,443 psi | 86% | 2451 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 49,676 psi | 88% | 2454 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,892 psi | 86% | 2470 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 48,225 psi | 85% | 2503 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 50,386 psi | 89% | 2464 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 48,066 psi | 85% | 2448 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 50,792 psi | 90% | 2375 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 50,212 psi | 89% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,704 psi | 86% | 2402 fps | 96.7% |
| Somchem S321 | <<locked>> | 84% | 49,850 psi | 88% | 2464 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 49,806 psi | 88% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 50,140 psi | 89% | 2464 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 50,372 psi | 89% | 2490 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,321 psi | 73% | 2451 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 50,618 psi | 89% | 2343 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 50,792 psi | 90% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 51,126 psi | 90% | 2431 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 49,414 psi | 87% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 48,515 psi | 86% | 2431 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,733 psi | 86% | 2487 fps | 99% |
| Vihtavuori N530 | <<locked>> | 86% | 49,385 psi | 87% | 2431 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 50,415 psi | 89% | 2448 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,688 psi | 84% | 2497 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,330 psi | 61% | 2336 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,777 psi | 88% | 2477 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 48,414 psi | 86% | 2470 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,125 psi | 89% | 2549 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 90% | 50,807 psi | 90% | 2500 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 27"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 42,279 psi | 75% | 2270 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,672 psi | 81% | 2362 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,737 psi | 61% | 2201 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,002 psi | 72% | 2329 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 32,851 psi | 58% | 2195 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 32,750 psi | 58% | 2257 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 38,769 psi | 69% | 2293 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 33,040 psi | 58% | 2162 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,741 psi | 72% | 2300 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 39,929 psi | 71% | 2290 fps | 100% |
| Alliant Power Pro 2000-MR | 39.3 gr | 80% | 34,867 psi | 62% | 2306 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,126 psi | 57% | 2182 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,747 psi | 84% | 2349 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,708 psi | 61% | 2234 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 32,198 psi | 57% | 2221 fps | 95% |
| Alliant Reloder-17 | 39.7 gr | 82% | 29,704 psi | 53% | 2195 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 96% | 28,979 psi | 51% | 2178 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,521 psi | 66% | 2290 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 31,386 psi | 55% | 2182 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 44,846 psi | 79% | 2372 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,743 psi | 76% | 2290 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,812 psi | 69% | 2316 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,525 psi | 75% | 2434 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 46,615 psi | 82% | 2385 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 47,036 psi | 83% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 34,606 psi | 61% | 2228 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 41,191 psi | 73% | 2402 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 39,044 psi | 69% | 2303 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 27,659 psi | 49% | 2090 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,795 psi | 62% | 2270 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 44,454 psi | 79% | 2467 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 46% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,637 psi | 67% | 2264 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 37,884 psi | 67% | 2297 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,621 psi | 61% | 2188 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 42,134 psi | 74% | 2297 fps | 95% |
| IMR 4350 | <<locked>> | 98% | 44,498 psi | 79% | 2392 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 44,135 psi | 78% | 2362 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 32,082 psi | 57% | 2221 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 35,476 psi | 63% | 2260 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 40,741 psi | 72% | 2300 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 45,629 psi | 81% | 2372 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 37,072 psi | 66% | 2274 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 39,494 psi | 70% | 2241 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 34,360 psi | 61% | 2195 fps | 98.6% |
| Lovex S065 | <<locked>> | 90% | 38,203 psi | 68% | 2270 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 40,741 psi | 72% | 2339 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 38,058 psi | 67% | 2251 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 38,058 psi | 67% | 2264 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,069 psi | 60% | 2224 fps | 97.4% |
| Norma URP | <<locked>> | 90% | 33,939 psi | 60% | 2264 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 33,431 psi | 59% | 2231 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 96% | 40,190 psi | 71% | 2388 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 40,611 psi | 72% | 2303 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,624 psi | 70% | 2320 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,121 psi | 78% | 2343 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,194 psi | 46% | 1355 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,687 psi | 81% | 2372 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 40,350 psi | 71% | 2310 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,694 psi | 63% | 2316 fps | 97.3% |
| ReloadSwiss RS 60 | 38.7 gr | 80% | 29,588 psi | 52% | 2201 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 33,040 psi | 58% | 2274 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 36,230 psi | 64% | 2329 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 41,684 psi | 74% | 2287 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,289 psi | 64% | 2211 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 29,559 psi | 52% | 2133 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 44,846 psi | 79% | 2372 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 38,203 psi | 68% | 2270 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,072 psi | 66% | 2274 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 34,360 psi | 61% | 2195 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 40,741 psi | 72% | 2339 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,748 psi | 54% | 2175 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,609 psi | 68% | 2277 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,231 psi | 66% | 2264 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,755 psi | 70% | 2215 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,648 psi | 58% | 2103 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 42,438 psi | 75% | 2310 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 43,598 psi | 77% | 2369 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 39,160 psi | 69% | 2218 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,232 psi | 68% | 2274 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 30,719 psi | 54% | 2142 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 25,063 psi | 44% | 2077 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 45,020 psi | 80% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,856 psi | 70% | 2211 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,186 psi | 62% | 2198 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,998 psi | 64% | 2205 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,066 psi | 51% | 2087 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 88% | 33,373 psi | 59% | 2218 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 40,683 psi | 72% | 2297 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 34,577 psi | 61% | 2198 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 32,590 psi | 58% | 2224 fps | 95% |
| Vihtavuori N555 | <<locked>> | 96% | 30,371 psi | 54% | 2244 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 27,920 psi | 49% | 2064 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 39,552 psi | 70% | 2333 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 41,191 psi | 73% | 2402 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,361 psi | 64% | 2267 fps | 98.4% |
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 96 powders for 7.62 x 53 R Fin. loaded with the .310 | 200gr | Rhino Penetrator. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,592 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,592 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.31" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Reloder-17 rank at the top here: for 7.62 x 53 R Fin. with the .310 | 200gr | 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.