Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 150gr | Frontier PH HPFB 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 Reloder-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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 2495 | <<locked>> | 84% | 52,808 psi | 85% | 2953 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,882 psi | 88% | 3005 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,500 psi | 76% | 2963 fps | 97.5% |
| Accurate 4064 | <<locked>> | 86% | 53,156 psi | 85% | 3005 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,243 psi | 85% | 3091 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 84% | 56,144 psi | 90% | 3084 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,751 psi | 86% | 3031 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,882 psi | 88% | 3127 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,868 psi | 88% | 3031 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,260 psi | 90% | 3002 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,231 psi | 90% | 3212 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,230 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,679 psi | 88% | 3081 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,128 psi | 87% | 3153 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,593 psi | 89% | 3189 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 3110 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2989 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,749 psi | 81% | 3176 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,057 psi | 90% | 3100 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 55,042 psi | 88% | 3074 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,781 psi | 88% | 3045 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,347 psi | 90% | 3012 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,723 psi | 88% | 3061 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,724 psi | 89% | 3087 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 55,811 psi | 89% | 3143 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 92% | 56,072 psi | 90% | 3104 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 53,214 psi | 85% | 3041 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,288 psi | 87% | 3077 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,127 psi | 85% | 3074 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,376 psi | 90% | 3182 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,389 psi | 87% | 3045 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,621 psi | 86% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,287 psi | 85% | 3015 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,289 psi | 90% | 3048 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 55,303 psi | 89% | 3071 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,997 psi | 85% | 3015 fps | 97.5% |
| IMR 4831 | <<locked>> | 96% | 53,766 psi | 86% | 3081 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 56,043 psi | 90% | 3110 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,868 psi | 88% | 3031 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,420 psi | 90% | 3061 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,216 psi | 89% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,272 psi | 85% | 3012 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,217 psi | 90% | 3071 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,027 psi | 87% | 3054 fps | 98% |
| Norma 201 | <<locked>> | 84% | 54,781 psi | 88% | 3028 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,521 psi | 89% | 3028 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,896 psi | 86% | 3064 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,072 psi | 90% | 3123 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 50,169 psi | 80% | 3123 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 55,695 psi | 89% | 3133 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,404 psi | 87% | 3087 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 54,549 psi | 87% | 3130 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 55,129 psi | 88% | 3051 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,056 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,448 psi | 58% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,767 psi | 89% | 3068 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,259 psi | 89% | 3146 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,114 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,243 psi | 85% | 3114 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,985 psi | 90% | 3202 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,782 psi | 89% | 3009 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,492 psi | 89% | 3028 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,882 psi | 88% | 3064 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,779 psi | 85% | 3091 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 54,781 psi | 88% | 3045 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,217 psi | 90% | 3071 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,420 psi | 90% | 3061 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,272 psi | 85% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,027 psi | 87% | 3054 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,069 psi | 85% | 3071 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,664 psi | 86% | 3025 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,505 psi | 87% | 3051 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,912 psi | 90% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,185 psi | 85% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,808 psi | 85% | 2963 fps | 97.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,286 psi | 84% | 3084 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 55,463 psi | 89% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,359 psi | 86% | 3015 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 55,056 psi | 88% | 3061 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,447 psi | 87% | 3140 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,635 psi | 86% | 3071 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 56,304 psi | 90% | 2943 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,463 psi | 89% | 2989 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,115 psi | 90% | 3005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,953 psi | 85% | 2986 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,520 psi | 87% | 3074 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 55,419 psi | 89% | 3031 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,375 psi | 87% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,606 psi | 86% | 3077 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,705 psi | 80% | 3071 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,462 psi | 87% | 3048 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,869 psi | 90% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,057 psi | 90% | 3150 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,205 psi | 64% | 3012 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,665 psi | 88% | 3061 fps | 100% |
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% | 46,354 psi | 74% | 2848 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,109 psi | 77% | 2884 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 41,321 psi | 66% | 2838 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 43,830 psi | 70% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,114 psi | 56% | 2720 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 49,400 psi | 79% | 2969 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 42,032 psi | 67% | 2808 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 51,314 psi | 82% | 3061 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,474 psi | 83% | 2976 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,765 psi | 85% | 2956 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,614 psi | 73% | 3018 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,163 psi | 68% | 2838 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,020 psi | 72% | 2904 fps | 98.9% |
| Alliant Reloder-16 | 59.3 gr | 82% | 34,766 psi | 56% | 2733 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,579 psi | 59% | 2805 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,502 psi | 81% | 3051 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,472 psi | 49% | 2631 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,462 psi | 57% | 2825 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,950 psi | 78% | 2976 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 42,148 psi | 68% | 2841 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 45,353 psi | 73% | 2867 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,910 psi | 85% | 2959 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,082 psi | 82% | 3002 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,670 psi | 68% | 2844 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 42,685 psi | 68% | 2894 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 49,342 psi | 79% | 2982 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 49,893 psi | 80% | 2982 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,124 psi | 48% | 2566 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,383 psi | 74% | 2956 fps | 99.8% |
| Hodgdon Superformance | 72.5 gr | 88% | 45,397 psi | 73% | 2979 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 43% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,776 psi | 77% | 2927 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 50,082 psi | 80% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,179 psi | 71% | 2848 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,528 psi | 75% | 2871 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 45,861 psi | 74% | 2900 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,019 psi | 71% | 2844 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 33,939 psi | 54% | 2674 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 46,122 psi | 74% | 2936 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 51,474 psi | 83% | 2976 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,197 psi | 79% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,863 psi | 78% | 2900 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 44,251 psi | 71% | 2851 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 38,827 psi | 62% | 2733 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 41,989 psi | 67% | 2822 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 48,341 psi | 78% | 2917 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,994 psi | 79% | 2923 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,396 psi | 71% | 2890 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 52,431 psi | 84% | 3061 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 43,714 psi | 70% | 2989 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 35,128 psi | 56% | 2720 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 44,382 psi | 71% | 2907 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 39,189 psi | 63% | 2825 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,605 psi | 83% | 2989 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,445 psi | 82% | 3009 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,873 psi | 69% | 2825 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,211 psi | 77% | 3025 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,914 psi | 62% | 2874 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,780 psi | 56% | 2733 fps | 95.1% |
| ReloadSwiss RS 70 | 66.5 gr | 84% | 36,985 psi | 59% | 2805 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 52,359 psi | 84% | 2956 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,108 psi | 74% | 2867 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,624 psi | 64% | 2782 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 49,284 psi | 79% | 3028 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 45,353 psi | 73% | 2867 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,827 psi | 62% | 2733 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,197 psi | 79% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,251 psi | 71% | 2851 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 41,989 psi | 67% | 2822 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,683 psi | 65% | 2835 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,096 psi | 80% | 2963 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,037 psi | 77% | 2940 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,458 psi | 79% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,481 psi | 67% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,395 psi | 70% | 2789 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,820 psi | 78% | 3022 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,095 psi | 79% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,777 psi | 80% | 2956 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,118 psi | 64% | 2782 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 29,544 psi | 47% | 2605 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 46,992 psi | 75% | 2949 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,879 psi | 80% | 2848 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,934 psi | 74% | 2841 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,383 psi | 74% | 2851 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,334 psi | 61% | 2717 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 34,243 psi | 55% | 2661 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 51,880 psi | 83% | 2972 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,730 psi | 72% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,143 psi | 58% | 2720 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 33,359 psi | 53% | 2717 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,808 psi | 54% | 2635 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 52,112 psi | 84% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,830 psi | 69% | 2897 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,819 psi | 46% | 2651 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,630 psi | 76% | 2940 fps | 99.8% |
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 114 powders for .300 Win. Mag. loaded with the .308 | 150gr | Frontier PH HPFB. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,212 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 Win. Mag. with the .308 | 150gr | Frontier PH HPFB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.