Load Specifications
Load data in caliber .300 WSM with .308 | 130gr | Barnes X BT 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, 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.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 54,824 psi | 86% | 3117 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,637 psi | 89% | 3189 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,143 psi | 85% | 3143 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,884 psi | 89% | 3241 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 57,159 psi | 90% | 3238 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3304 fps | 98.6% |
| ADI AR 2206H | <<locked>> | 88% | 56,869 psi | 89% | 3258 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 94% | 57,421 psi | 90% | 3248 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,738 psi | 87% | 3209 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 86% | 56,115 psi | 88% | 3192 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 57,421 psi | 90% | 3330 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,028 psi | 88% | 3369 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 57,537 psi | 90% | 3278 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,261 psi | 90% | 3169 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,766 psi | 86% | 3241 fps | 98.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,519 psi | 84% | 3291 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,534 psi | 85% | 3337 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,146 psi | 61% | 2992 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,449 psi | 88% | 3264 fps | 98.8% |
| Bofors RP3 | <<locked>> | 92% | 55,201 psi | 87% | 3241 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 57,450 psi | 90% | 3192 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,332 psi | 87% | 3241 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,550 psi | 89% | 3337 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 84% | 55,448 psi | 87% | 3199 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,985 psi | 88% | 3245 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 96% | 56,637 psi | 89% | 3310 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 57,377 psi | 90% | 3274 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,763 psi | 78% | 3159 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,318 psi | 88% | 3297 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 56% | 2014 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 57,159 psi | 90% | 3251 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 55,390 psi | 87% | 3238 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,159 psi | 88% | 3215 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,854 psi | 88% | 3179 fps | 95.9% |
| IMR 4198 | <<locked>> | 82% | 56,652 psi | 89% | 3123 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,666 psi | 89% | 3222 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,181 psi | 74% | 3120 fps | 97.1% |
| IMR 4895 | <<locked>> | 90% | 56,130 psi | 88% | 3278 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 86% | 55,738 psi | 87% | 3209 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 82% | 56,478 psi | 89% | 3196 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,884 psi | 89% | 3241 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,159 psi | 88% | 3176 fps | 99.4% |
| Lovex S062 | <<locked>> | 92% | 57,246 psi | 90% | 3238 fps | 99.9% |
| Lovex S065 | <<locked>> | 98% | 56,362 psi | 88% | 3219 fps | 97.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 3251 fps | 96.5% |
| Norma 201 | <<locked>> | 88% | 55,883 psi | 88% | 3205 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 56,144 psi | 88% | 3209 fps | 100% |
| Norma 203B | <<locked>> | 92% | 57,377 psi | 90% | 3287 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 54,737 psi | 86% | 3278 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 90% | 54,259 psi | 85% | 3248 fps | 99.1% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,606 psi | 84% | 3261 fps | 96.5% |
| Ramshot TAC | <<locked>> | 86% | 56,028 psi | 88% | 3212 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,463 psi | 87% | 3235 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,666 psi | 89% | 3202 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,201 psi | 57% | 2067 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,071 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,275 psi | 88% | 3219 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,752 psi | 86% | 3310 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,418 psi | 85% | 3350 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3317 fps | 98.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 3337 fps | 97.9% |
| Rottweil R 901 | <<locked>> | 86% | 57,348 psi | 90% | 3199 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,405 psi | 88% | 3202 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 54,955 psi | 86% | 3232 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,362 psi | 88% | 3219 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,884 psi | 89% | 3241 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 57,246 psi | 90% | 3238 fps | 99.9% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 3251 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,999 psi | 88% | 3284 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 57,638 psi | 90% | 3192 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,781 psi | 86% | 3189 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,955 psi | 86% | 3219 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,217 psi | 90% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 57,101 psi | 89% | 3136 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,913 psi | 89% | 3163 fps | 96.1% |
| Somchem S321 | <<locked>> | 84% | 57,145 psi | 90% | 3241 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,536 psi | 89% | 3140 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 57,667 psi | 90% | 3241 fps | 99.5% |
| Somchem S355 | <<locked>> | 94% | 55,230 psi | 87% | 3228 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3228 fps | 99.8% |
| Unknown powder | <<locked>> | 98% | 55,854 psi | 88% | 3287 fps | 98% |
| Vihtavuori N130 | <<locked>> | 84% | 55,651 psi | 87% | 3097 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,362 psi | 88% | 3120 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,724 psi | 87% | 3173 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,564 psi | 87% | 3173 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3205 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 56,536 psi | 89% | 3258 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 84% | 55,390 psi | 87% | 3215 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 90% | 55,477 psi | 87% | 3199 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,739 psi | 89% | 3310 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,308 psi | 66% | 3084 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,302 psi | 85% | 3192 fps | 99.6% |
| Winchester 748 | <<locked>> | 84% | 56,550 psi | 89% | 3268 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,637 psi | 89% | 3310 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,275 psi | 88% | 3251 fps | 99.7% |
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% | 48,544 psi | 76% | 3015 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,258 psi | 83% | 3133 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,482 psi | 67% | 2940 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,659 psi | 73% | 3064 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 40,059 psi | 63% | 2923 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 40,364 psi | 63% | 2992 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,556 psi | 70% | 3022 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 40,234 psi | 63% | 2907 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,340 psi | 73% | 3035 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,441 psi | 73% | 3041 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 53,853 psi | 84% | 3264 fps | 99.4% |
| Alliant Power Pro 2000-MR | 58.9 gr | 80% | 40,335 psi | 63% | 3028 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,753 psi | 59% | 2881 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,041 psi | 85% | 3123 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,451 psi | 63% | 2949 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,250 psi | 66% | 3051 fps | 95.7% |
| Alliant Reloder-17 | 60.9 gr | 84% | 37,173 psi | 58% | 2953 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 36,869 psi | 58% | 2933 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,511 psi | 68% | 3015 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 37,782 psi | 59% | 2890 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,182 psi | 76% | 3028 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,440 psi | 71% | 3058 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,342 psi | 77% | 3205 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 49,023 psi | 77% | 3091 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 43,656 psi | 68% | 3005 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 53,142 psi | 83% | 3248 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 44,904 psi | 70% | 3038 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,795 psi | 55% | 2822 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,522 psi | 60% | 2943 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 42% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,958 psi | 63% | 2910 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 40,814 psi | 64% | 2976 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,463 psi | 59% | 2831 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 92% | 52,591 psi | 82% | 3120 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 53,316 psi | 84% | 3074 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,345 psi | 84% | 3163 fps | 95.3% |
| IMR 4831 | <<locked>> | 96% | 41,959 psi | 66% | 3009 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,336 psi | 65% | 2982 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 46,340 psi | 73% | 3035 fps | 98.9% |
| Lovex D073.5 | <<locked>> | 80% | 53,171 psi | 83% | 3143 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 44,019 psi | 69% | 3012 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 44,425 psi | 70% | 2956 fps | 97.6% |
| Lovex S062 | <<locked>> | 80% | 40,161 psi | 63% | 2907 fps | 97.8% |
| Lovex S065 | <<locked>> | 92% | 47,268 psi | 74% | 3051 fps | 95.5% |
| Lovex S070 | <<locked>> | 96% | 50,952 psi | 80% | 3140 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,150 psi | 69% | 2982 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 44,005 psi | 69% | 2992 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 39,856 psi | 62% | 2936 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 42,598 psi | 67% | 3041 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,146 psi | 61% | 2940 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 96% | 47,471 psi | 74% | 3143 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 46,514 psi | 73% | 3028 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,832 psi | 72% | 3054 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,212 psi | 79% | 3087 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 42% | 1850 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,764 psi | 81% | 3133 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 49,632 psi | 78% | 3097 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,916 psi | 66% | 3051 fps | 96.3% |
| ReloadSwiss RS 60 | 58 gr | 80% | 34,766 psi | 54% | 2897 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,598 psi | 67% | 3064 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 45,411 psi | 71% | 3130 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 48,530 psi | 76% | 3048 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,105 psi | 66% | 2930 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 35,694 psi | 56% | 2828 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 47,268 psi | 74% | 3051 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,019 psi | 69% | 3012 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 40,161 psi | 63% | 2907 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 96% | 50,952 psi | 80% | 3140 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 38,493 psi | 60% | 2930 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 54,259 psi | 85% | 3140 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,107 psi | 71% | 3005 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,946 psi | 67% | 2982 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,034 psi | 71% | 2936 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,608 psi | 59% | 2785 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,403 psi | 84% | 3107 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 50,227 psi | 79% | 3123 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 44,875 psi | 70% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,324 psi | 69% | 2999 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 36,376 psi | 57% | 2831 fps | 95.8% |
| Somchem S365 | <<locked>> | 86% | 32,184 psi | 50% | 2812 fps | 95.5% |
| Unknown powder | <<locked>> | 90% | 43,352 psi | 68% | 3045 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 49,574 psi | 78% | 2999 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,293 psi | 66% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,191 psi | 65% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,075 psi | 64% | 2910 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 31,270 psi | 49% | 2677 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 88% | 41,002 psi | 64% | 2959 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 48,820 psi | 77% | 3097 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 40,901 psi | 64% | 2927 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 41,626 psi | 65% | 3012 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 39,697 psi | 62% | 3022 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 34,867 psi | 55% | 2779 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 49,414 psi | 77% | 3146 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 53,142 psi | 83% | 3248 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,402 psi | 82% | 3186 fps | 99.3% |
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 .300 WSM loaded with the .308 | 130gr | Barnes X BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,369 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,369 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 (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.308" calls for a 1:14.0 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 .300 WSM with the .308 | 130gr | Barnes X BT 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.