Load Specifications
Load data in caliber .300 WSM with .308 | 134gr | CutEdge ESP Raptor 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, 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 56,130 psi | 88% | 3091 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,376 psi | 88% | 3196 fps | 98.6% |
| Accurate 2230 | <<locked>> | 82% | 57,348 psi | 90% | 3205 fps | 99% |
| Accurate 2460 | <<locked>> | 86% | 54,520 psi | 85% | 3110 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,768 psi | 89% | 3146 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,433 psi | 85% | 3156 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 56,376 psi | 88% | 3189 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,295 psi | 71% | 3061 fps | 96.2% |
| Accurate LT-30 | <<locked>> | 84% | 56,028 psi | 88% | 3038 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,449 psi | 88% | 3064 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,303 psi | 87% | 3179 fps | 99.1% |
| ADI AR 2207 | <<locked>> | 82% | 57,421 psi | 90% | 3061 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 56,463 psi | 88% | 3173 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 84% | 56,927 psi | 89% | 3169 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,520 psi | 85% | 3133 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 90% | 54,273 psi | 85% | 3123 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,014 psi | 88% | 3251 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,998 psi | 86% | 3291 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,608 psi | 87% | 3196 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,724 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,391 psi | 88% | 3215 fps | 98.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,513 psi | 71% | 3074 fps | 96.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3251 fps | 99.3% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,390 psi | 87% | 3028 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,303 psi | 87% | 3189 fps | 98.4% |
| Bofors RP3 | <<locked>> | 98% | 55,840 psi | 88% | 3205 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,884 psi | 89% | 3127 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 57,348 psi | 90% | 3222 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,463 psi | 87% | 3264 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 88% | 54,302 psi | 85% | 3130 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,289 psi | 88% | 3166 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 57,725 psi | 90% | 3219 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 82% | 54,288 psi | 85% | 3038 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 55,767 psi | 87% | 3192 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,539 psi | 65% | 2946 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,360 psi | 85% | 3215 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,229 psi | 54% | 1932 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 55,869 psi | 88% | 3173 fps | 99.4% |
| IMR 3031 | <<locked>> | 96% | 56,623 psi | 89% | 3212 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,549 psi | 85% | 3133 fps | 98.7% |
| IMR 4198 | <<locked>> | 86% | 56,275 psi | 88% | 3064 fps | 100% |
| IMR 4895 | <<locked>> | 94% | 54,099 psi | 85% | 3192 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 90% | 54,520 psi | 85% | 3133 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 86% | 54,447 psi | 85% | 3117 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 92% | 54,128 psi | 85% | 3153 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,506 psi | 87% | 3107 fps | 99.1% |
| Lovex S062 | <<locked>> | 96% | 55,114 psi | 86% | 3153 fps | 99.7% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 3071 fps | 96% |
| Norma 200 | <<locked>> | 82% | 55,608 psi | 87% | 3071 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,392 psi | 90% | 3179 fps | 99.8% |
| Norma 202 | <<locked>> | 92% | 54,157 psi | 85% | 3130 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,492 psi | 87% | 3202 fps | 99.2% |
| Norma URPᴾ | <<locked>> | 100% | 45,455 psi | 71% | 3058 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 96% | 56,217 psi | 88% | 3225 fps | 99.1% |
| Ramshot TAC | <<locked>> | 90% | 55,477 psi | 87% | 3146 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,389 psi | 85% | 3163 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,101 psi | 88% | 3136 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,432 psi | 54% | 1978 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,389 psi | 85% | 3123 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,650 psi | 86% | 3133 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,681 psi | 89% | 3291 fps | 98.9% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 3327 fps | 100% |
| Rottweil R 901 | <<locked>> | 90% | 54,578 psi | 86% | 3110 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 57,508 psi | 90% | 3169 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 3189 fps | 99.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,937 psi | 80% | 3071 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,128 psi | 85% | 3153 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,114 psi | 86% | 3153 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,244 psi | 85% | 3087 fps | 99.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,985 psi | 88% | 2776 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 57,305 psi | 90% | 3176 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,259 psi | 85% | 3202 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,145 psi | 90% | 3130 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,072 psi | 89% | 3173 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 57,464 psi | 90% | 3205 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,014 psi | 88% | 3074 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,840 psi | 88% | 3064 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 56,028 psi | 88% | 3176 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 54,940 psi | 86% | 3064 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,550 psi | 89% | 3169 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 3196 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,451 psi | 63% | 2999 fps | 98.2% |
| Unknown powderᴾ | <<locked>> | 100% | 50,125 psi | 79% | 3133 fps | 96.5% |
| Vihtavuori N120 | <<locked>> | 84% | 56,695 psi | 89% | 2992 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,505 psi | 85% | 3028 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 55,042 psi | 86% | 3051 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,666 psi | 89% | 3140 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 57,450 psi | 90% | 3150 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 47,471 psi | 74% | 3009 fps | 99.3% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 3107 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 88% | 54,447 psi | 85% | 3146 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 96% | 57,493 psi | 90% | 3182 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 3156 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3054 fps | 98.8% |
| Winchester 748 | <<locked>> | 88% | 55,419 psi | 87% | 3199 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,608 psi | 87% | 3189 fps | 99.5% |
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% | 40,582 psi | 64% | 2831 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,634 psi | 82% | 3130 fps | 98.1% |
| Accurate 2230 | <<locked>> | 80% | 53,461 psi | 84% | 3140 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 44,222 psi | 69% | 2933 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 32,706 psi | 51% | 2707 fps | 99.7% |
| Accurate 2520 | <<locked>> | 80% | 38,116 psi | 60% | 2854 fps | 98.5% |
| Accurate 4064 | <<locked>> | 80% | 30,966 psi | 49% | 2680 fps | 97.6% |
| Accurate 4350 | <<locked>> | 98% | 42,221 psi | 66% | 2995 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 49,559 psi | 78% | 2940 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,951 psi | 78% | 2959 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 37,405 psi | 59% | 2818 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 53,882 psi | 84% | 3012 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 41,089 psi | 64% | 2884 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 49,588 psi | 78% | 3054 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,465 psi | 62% | 2841 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 80% | 38,421 psi | 60% | 2861 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,643 psi | 72% | 3061 fps | 98.1% |
| Alliant Power Pro 2000-MR | 57.7 gr | 86% | 41,510 psi | 65% | 3012 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,215 psi | 55% | 2785 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,311 psi | 73% | 2949 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 40,712 psi | 64% | 2917 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,801 psi | 67% | 3012 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 90% | 37,449 psi | 59% | 2913 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,631 psi | 76% | 2927 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 41,989 psi | 66% | 2940 fps | 95.4% |
| Bofors RP3 | <<locked>> | 84% | 34,389 psi | 54% | 2776 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,713 psi | 65% | 2851 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,550 psi | 59% | 2848 fps | 97.4% |
| Hodgdon CFE223 | 55 gr | 80% | 41,495 psi | 65% | 2992 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 80% | 41,698 psi | 65% | 2907 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 80% | 48,733 psi | 76% | 3045 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 44,077 psi | 69% | 2972 fps | 95.2% |
| Hodgdon H4198 | <<locked>> | 80% | 51,271 psi | 80% | 2989 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 37,637 psi | 59% | 2831 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,390 psi | 57% | 2825 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 33,939 psi | 53% | 2785 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,382 psi | 40% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 35,897 psi | 56% | 2772 fps | 95.3% |
| IMR 3031 | <<locked>> | 80% | 33,286 psi | 52% | 2769 fps | 99.3% |
| IMR 4064 | <<locked>> | 88% | 40,089 psi | 63% | 2858 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 47,007 psi | 74% | 2923 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 36,506 psi | 57% | 2831 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 39,465 psi | 62% | 2841 fps | 97.3% |
| Lovex D073.5 | <<locked>> | 80% | 44,135 psi | 69% | 2936 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 35,723 psi | 56% | 2795 fps | 97.9% |
| Lovex S060 | <<locked>> | 80% | 38,189 psi | 60% | 2769 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 32,822 psi | 51% | 2694 fps | 95.2% |
| Lovex S065 | <<locked>> | 98% | 47,630 psi | 75% | 3012 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 51,996 psi | 81% | 3018 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,492 psi | 57% | 2772 fps | 96.5% |
| Norma 202 | <<locked>> | 80% | 36,666 psi | 57% | 2795 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 37,333 psi | 59% | 2841 fps | 95.3% |
| Norma URP | <<locked>> | 98% | 42,612 psi | 67% | 2999 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 39,726 psi | 62% | 2913 fps | 95.8% |
| Ramshot TAC | <<locked>> | 86% | 48,298 psi | 76% | 3015 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,609 psi | 61% | 2851 fps | 95.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,917 psi | 67% | 2894 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,469 psi | 40% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,454 psi | 70% | 2946 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 51,155 psi | 80% | 3074 fps | 95.2% |
| ReloadSwiss RS 52 | 54.7 gr | 84% | 39,682 psi | 62% | 2963 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,619 psi | 51% | 2795 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 80% | 40,045 psi | 63% | 2841 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 80% | 34,635 psi | 54% | 2717 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 86% | 34,476 psi | 54% | 2772 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 47,630 psi | 75% | 3012 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,723 psi | 56% | 2795 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 32,822 psi | 51% | 2694 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,137 psi | 74% | 2963 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,214 psi | 83% | 2740 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,966 psi | 78% | 3061 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 38,754 psi | 61% | 2897 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,137 psi | 74% | 2972 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,021 psi | 72% | 2979 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 38,682 psi | 61% | 2844 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,377 psi | 60% | 2756 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,386 psi | 49% | 2598 fps | 98.2% |
| Somchem S321 | <<locked>> | 80% | 42,540 psi | 67% | 2930 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 37,739 psi | 59% | 2753 fps | 99.4% |
| Somchem S341 | <<locked>> | 80% | 37,188 psi | 58% | 2799 fps | 95% |
| Somchem S355 | <<locked>> | 86% | 35,650 psi | 56% | 2785 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 33,112 psi | 52% | 2805 fps | 95.6% |
| Unknown powder | <<locked>> | 98% | 47,021 psi | 74% | 3074 fps | 95.8% |
| Vihtavuori N120 | <<locked>> | 80% | 50,270 psi | 79% | 2904 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,670 psi | 67% | 2835 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,839 psi | 56% | 2707 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 80% | 33,634 psi | 53% | 2723 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 80% | 34,127 psi | 53% | 2713 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 88% | 32,169 psi | 50% | 2677 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 96% | 44,396 psi | 70% | 2989 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 41,510 psi | 65% | 2904 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 80% | 33,924 psi | 53% | 2730 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 96% | 44,338 psi | 69% | 3031 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 37,724 psi | 59% | 2808 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 41,655 psi | 65% | 2949 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,237 psi | 69% | 2986 fps | 97.8% |
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 96 powders for .300 WSM loaded with the .308 | 134gr | CutEdge ESP Raptor. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,327 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,327 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 (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 134.0 gr projectile in 0.308" calls for a 1:9.5 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for .300 WSM with the .308 | 134gr | CutEdge ESP Raptor 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.