Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Frontier RSBT bullet and 94 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 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>> | 82% | 54,650 psi | 86% | 2956 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,985 psi | 88% | 3022 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3061 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 55,129 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,043 psi | 88% | 3120 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,566 psi | 90% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,303 psi | 87% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,029 psi | 89% | 3163 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,708 psi | 86% | 3150 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,520 psi | 85% | 3169 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,115 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,304 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,550 psi | 89% | 3179 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,157 psi | 85% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,246 psi | 88% | 3146 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 3146 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 3081 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,048 psi | 69% | 2989 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,259 psi | 85% | 3222 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,711 psi | 90% | 3114 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,197 psi | 77% | 3061 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 56,927 psi | 89% | 3087 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 3146 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 56,391 psi | 88% | 3071 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 57,435 psi | 90% | 3107 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,592 psi | 86% | 3114 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 88% | 54,375 psi | 85% | 3071 fps | 97.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3136 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,029 psi | 89% | 3100 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,911 psi | 86% | 3087 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,868 psi | 86% | 3150 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,695 psi | 87% | 3051 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,665 psi | 86% | 3028 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,276 psi | 90% | 3061 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 57,305 psi | 90% | 3100 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,375 psi | 85% | 3038 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 56,376 psi | 88% | 3110 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,201 psi | 85% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,434 psi | 88% | 3084 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 56,231 psi | 88% | 3015 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,824 psi | 86% | 3022 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,534 psi | 85% | 3038 fps | 99.4% |
| Lovex S070 | <<locked>> | 92% | 55,912 psi | 88% | 3081 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,788 psi | 70% | 2897 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 56,086 psi | 88% | 3035 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,898 psi | 89% | 3031 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,593 psi | 87% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,505 psi | 85% | 3094 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 57,072 psi | 89% | 3235 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 54,650 psi | 86% | 3104 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 56,478 psi | 89% | 3104 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 57,246 psi | 90% | 3159 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,891 psi | 73% | 2995 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,406 psi | 90% | 3087 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,290 psi | 90% | 3166 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,595 psi | 90% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,840 psi | 88% | 3140 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,375 psi | 85% | 3169 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,985 psi | 89% | 3038 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,971 psi | 89% | 3081 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,056 psi | 86% | 3071 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 55,477 psi | 87% | 3133 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 56,391 psi | 88% | 3071 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,534 psi | 85% | 3038 fps | 99.4% |
| Shooters World Precision | <<locked>> | 84% | 54,824 psi | 86% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,912 psi | 88% | 3081 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,955 psi | 86% | 3087 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,941 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,942 psi | 89% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,447 psi | 85% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,375 psi | 85% | 2986 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,998 psi | 86% | 3127 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 56,536 psi | 89% | 2959 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,029 psi | 89% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,942 psi | 89% | 3061 fps | 95.8% |
| Somchem S365 | <<locked>> | 96% | 57,740 psi | 90% | 3163 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,289 psi | 88% | 3107 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 57,435 psi | 90% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,174 psi | 90% | 2995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,421 psi | 90% | 3009 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,694 psi | 86% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,782 psi | 89% | 3100 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 3015 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 55,622 psi | 87% | 3002 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,912 psi | 88% | 3104 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 3166 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3225 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,565 psi | 89% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,810 psi | 86% | 3117 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,687 psi | 72% | 3130 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,057 psi | 88% | 3068 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3104 fps | 97.7% |
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 2495 | <<locked>> | 80% | 51,401 psi | 81% | 2910 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,153 psi | 77% | 2904 fps | 97% |
| Accurate 3100 | <<locked>> | 88% | 35,737 psi | 56% | 2700 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,660 psi | 76% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,043 psi | 58% | 2753 fps | 97.2% |
| ADI AR 2206H | <<locked>> | 80% | 54,070 psi | 85% | 3041 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,876 psi | 72% | 2877 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 46,833 psi | 73% | 2972 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 51,184 psi | 80% | 3081 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,792 psi | 80% | 3104 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,325 psi | 73% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,545 psi | 78% | 2979 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,100 psi | 57% | 2759 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,901 psi | 64% | 2897 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,340 psi | 73% | 2963 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,905 psi | 74% | 3018 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 28,152 psi | 44% | 2549 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,332 psi | 57% | 2799 fps | 95.8% |
| Alliant Reloder-26 | 74.3 gr | 86% | 34,925 psi | 55% | 2805 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,998 psi | 85% | 3054 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 46,035 psi | 72% | 2999 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,760 psi | 73% | 2917 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,905 psi | 74% | 3018 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 41,133 psi | 64% | 2776 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 47,137 psi | 74% | 2927 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 41,713 psi | 65% | 2864 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 82% | 44,773 psi | 70% | 2887 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,751 psi | 84% | 3074 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,649 psi | 53% | 2651 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,285 psi | 80% | 3028 fps | 100% |
| Hodgdon Superformance | 73 gr | 82% | 40,770 psi | 64% | 2871 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,257 psi | 82% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,254 psi | 76% | 2917 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,517 psi | 79% | 2946 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 41,785 psi | 65% | 2808 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,511 psi | 67% | 2805 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 35,491 psi | 56% | 2700 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 50,850 psi | 80% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,997 psi | 83% | 3025 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 52,808 psi | 83% | 2959 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,428 psi | 76% | 2917 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,089 psi | 63% | 2756 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 38,305 psi | 60% | 2730 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 36,782 psi | 58% | 2723 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,837 psi | 83% | 2982 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,388 psi | 84% | 2979 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,921 psi | 77% | 2966 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,587 psi | 75% | 2966 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 40,103 psi | 63% | 2900 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,854 psi | 58% | 2746 fps | 97% |
| Ramshot Big Game | <<locked>> | 80% | 49,284 psi | 77% | 2986 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 38,174 psi | 60% | 2789 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 43,555 psi | 68% | 2927 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 43% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,978 psi | 74% | 2904 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,606 psi | 84% | 3104 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,439 psi | 68% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,680 psi | 57% | 2766 fps | 96.8% |
| ReloadSwiss RS 70 | 68.5 gr | 80% | 35,839 psi | 56% | 2769 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,328 psi | 79% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,005 psi | 69% | 2861 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,590 psi | 81% | 3009 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 45,353 psi | 71% | 2946 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 41,133 psi | 64% | 2776 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,089 psi | 63% | 2756 fps | 96.8% |
| Shooters World Precision | <<locked>> | 80% | 48,428 psi | 76% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,305 psi | 60% | 2730 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,136 psi | 71% | 2913 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,562 psi | 82% | 3009 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,534 psi | 84% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,295 psi | 71% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,204 psi | 61% | 2694 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,947 psi | 70% | 2936 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 53,359 psi | 84% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,309 psi | 69% | 2858 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 53,258 psi | 83% | 2999 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 33,243 psi | 52% | 2697 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 43,236 psi | 68% | 2867 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 54,114 psi | 85% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,546 psi | 79% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,763 psi | 80% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,308 psi | 66% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,247 psi | 60% | 2749 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 94% | 42,482 psi | 67% | 2838 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 49,095 psi | 77% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,753 psi | 59% | 2749 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 31,096 psi | 49% | 2631 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 53,403 psi | 84% | 3156 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,521 psi | 59% | 2720 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 39,073 psi | 61% | 2802 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,413 psi | 45% | 2644 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,634 psi | 82% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,701 psi | 72% | 2910 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 105 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Frontier RSBT. Norma MRP delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,235 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Frontier RSBT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.