Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 132gr | Brenneke TIG nature bullet and 93 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% | 54,607 psi | 88% | 3136 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,330 psi | 86% | 3153 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,405 psi | 89% | 3225 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 53,316 psi | 85% | 3199 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,809 psi | 86% | 3281 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 86% | 54,172 psi | 87% | 3238 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 55,463 psi | 89% | 3238 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,156 psi | 85% | 3186 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 84% | 53,722 psi | 86% | 3166 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,114 psi | 87% | 3360 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,434 psi | 89% | 3261 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,898 psi | 90% | 3284 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,085 psi | 88% | 3346 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,779 psi | 85% | 3327 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,320 psi | 63% | 3028 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,237 psi | 71% | 3202 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,215 psi | 87% | 3248 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 55,854 psi | 90% | 3274 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,260 psi | 90% | 3238 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,781 psi | 88% | 3173 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,333 psi | 90% | 3274 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,404 psi | 87% | 3317 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 90% | 53,447 psi | 86% | 3225 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 96% | 53,316 psi | 85% | 3274 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 54,708 psi | 88% | 3248 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,256 psi | 82% | 3205 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,288 psi | 87% | 3281 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 96% | 54,041 psi | 87% | 3307 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 57% | 2041 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,188 psi | 90% | 3258 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 54,563 psi | 87% | 3238 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,752 psi | 88% | 3219 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,723 psi | 88% | 3189 fps | 96.7% |
| IMR 4350 | <<locked>> | 98% | 53,171 psi | 85% | 3202 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,592 psi | 88% | 3212 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 3271 fps | 99.1% |
| IMR 4895 | <<locked>> | 88% | 53,722 psi | 86% | 3258 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 84% | 53,156 psi | 85% | 3186 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 86% | 53,664 psi | 86% | 3209 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,664 psi | 86% | 3163 fps | 99.6% |
| Lovex S062 | <<locked>> | 90% | 54,563 psi | 87% | 3219 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,809 psi | 86% | 3202 fps | 97.8% |
| Lovex S070 | <<locked>> | 98% | 54,940 psi | 88% | 3241 fps | 97% |
| Norma 201 | <<locked>> | 88% | 56,289 psi | 90% | 3235 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,316 psi | 85% | 3182 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,085 psi | 88% | 3268 fps | 99.7% |
| Norma URP | <<locked>> | 98% | 52,953 psi | 85% | 3264 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 90% | 56,043 psi | 90% | 3297 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,550 psi | 89% | 3320 fps | 97.9% |
| Ramshot TAC | <<locked>> | 84% | 53,476 psi | 86% | 3192 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,142 psi | 85% | 3215 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,925 psi | 86% | 3179 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 57% | 2087 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,043 psi | 90% | 3225 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,780 psi | 86% | 3205 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,707 psi | 85% | 3291 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,304 psi | 90% | 3396 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,693 psi | 86% | 3301 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,534 psi | 86% | 3330 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 84% | 53,316 psi | 85% | 3163 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,200 psi | 85% | 3176 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 55,709 psi | 89% | 3264 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 56,260 psi | 90% | 3238 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,809 psi | 86% | 3202 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,664 psi | 86% | 3209 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,563 psi | 87% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,940 psi | 88% | 3241 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,143 psi | 87% | 3271 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,608 psi | 89% | 3235 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,188 psi | 90% | 3261 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,331 psi | 87% | 3123 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,665 psi | 88% | 3117 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,172 psi | 87% | 3150 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 54,433 psi | 87% | 3219 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,722 psi | 86% | 3117 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,288 psi | 89% | 3225 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 56,188 psi | 90% | 3264 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,966 psi | 82% | 3271 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,867 psi | 86% | 3084 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,665 psi | 88% | 3110 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,011 psi | 85% | 3146 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,099 psi | 87% | 3163 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,128 psi | 87% | 3186 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,579 psi | 89% | 3268 fps | 99% |
| Vihtavuori N530 | <<locked>> | 84% | 53,621 psi | 86% | 3186 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 90% | 55,927 psi | 90% | 3209 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,665 psi | 88% | 3268 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,989 psi | 69% | 3110 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,318 psi | 90% | 3245 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,534 psi | 86% | 3235 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,316 psi | 85% | 3274 fps | 96.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,041 psi | 56% | 2999 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,362 psi | 90% | 3271 fps | 99.9% |
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% | 48,196 psi | 77% | 3031 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,495 psi | 65% | 2927 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,008 psi | 77% | 3104 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,305 psi | 61% | 2910 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 37,449 psi | 60% | 2940 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,556 psi | 71% | 3051 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,768 psi | 61% | 2871 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,673 psi | 75% | 3068 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 46,876 psi | 75% | 3058 fps | 100% |
| Alliant Power Pro 2000-MR | 63.9 gr | 80% | 40,640 psi | 65% | 3071 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,304 psi | 60% | 2894 fps | 97.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,190 psi | 64% | 2969 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,550 psi | 60% | 2963 fps | 95.1% |
| Alliant Reloder-17 | 64.5 gr | 82% | 34,621 psi | 56% | 2907 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 34,418 psi | 55% | 2894 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,075 psi | 66% | 3123 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,077 psi | 71% | 3051 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 36,825 psi | 59% | 2890 fps | 97.3% |
| Bofors RP7 | <<locked>> | 94% | 52,663 psi | 84% | 3173 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,414 psi | 78% | 3061 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,629 psi | 73% | 3081 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,676 psi | 81% | 3248 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 40,495 psi | 65% | 2963 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 49,588 psi | 80% | 3205 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 44,962 psi | 72% | 3064 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,301 psi | 55% | 2838 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,162 psi | 66% | 3025 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 94% | 50,111 psi | 80% | 3232 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 42% | 1824 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,207 psi | 69% | 3012 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 44,657 psi | 72% | 3068 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,595 psi | 63% | 2913 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,124 psi | 77% | 3068 fps | 95.2% |
| IMR 4350 | <<locked>> | 96% | 49,821 psi | 80% | 3140 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,240 psi | 77% | 3094 fps | 95% |
| IMR 4831 | <<locked>> | 90% | 38,667 psi | 62% | 2953 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,205 psi | 66% | 3005 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 46,673 psi | 75% | 3068 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 43,598 psi | 70% | 3025 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 44,643 psi | 72% | 2989 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 39,552 psi | 63% | 2920 fps | 98.3% |
| Lovex S065 | <<locked>> | 90% | 44,541 psi | 71% | 3025 fps | 95.7% |
| Lovex S070 | <<locked>> | 94% | 48,196 psi | 77% | 3117 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 43,453 psi | 70% | 2999 fps | 99% |
| Norma 202 | <<locked>> | 80% | 43,859 psi | 70% | 3012 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,581 psi | 63% | 2956 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 40,466 psi | 65% | 3012 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 39,320 psi | 63% | 2966 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 45,353 psi | 73% | 3123 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,775 psi | 75% | 3064 fps | 96.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,267 psi | 74% | 3087 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,444 psi | 81% | 3120 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,382 psi | 42% | 1867 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,504 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,050 psi | 75% | 3077 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,380 psi | 68% | 3084 fps | 97.2% |
| ReloadSwiss RS 60 | 62.9 gr | 80% | 34,389 psi | 55% | 2917 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,147 psi | 64% | 3028 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,236 psi | 69% | 3110 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 47,210 psi | 76% | 3051 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,191 psi | 66% | 2940 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,548 psi | 55% | 2825 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 94% | 52,663 psi | 84% | 3173 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,541 psi | 71% | 3025 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,598 psi | 70% | 3025 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 39,552 psi | 63% | 2920 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 94% | 48,196 psi | 77% | 3117 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,781 psi | 57% | 2884 fps | 95.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,991 psi | 72% | 3031 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,033 psi | 69% | 3012 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,788 psi | 72% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,231 psi | 60% | 2799 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,369 psi | 76% | 3025 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 50,807 psi | 81% | 3156 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 44,512 psi | 71% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,846 psi | 72% | 3031 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 35,563 psi | 57% | 2838 fps | 96.3% |
| Somchem S365 | <<locked>> | 84% | 29,269 psi | 47% | 2746 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 50,633 psi | 81% | 3035 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,179 psi | 72% | 2956 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,712 psi | 65% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,481 psi | 67% | 2936 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 33,765 psi | 54% | 2769 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 88% | 39,581 psi | 63% | 2956 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 46,688 psi | 75% | 3061 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 40,103 psi | 64% | 2920 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 38,870 psi | 62% | 2946 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 37,492 psi | 60% | 2986 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,300 psi | 52% | 2736 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 46,630 psi | 75% | 3110 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 49,864 psi | 80% | 3209 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,808 psi | 53% | 2923 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,554 psi | 68% | 3012 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 106 powders for .300 Win. Mag. loaded with the .308 | 132gr | Brenneke TIG nature. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,396 fps; across all powders the maximum-charge window runs from 2,041 fps to 3,396 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 132.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 Win. Mag. with the .308 | 132gr | Brenneke TIG nature they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.