Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 140gr | Peregrine VLR5 (VLR-5) 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, 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.
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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>> | 84% | 54,331 psi | 87% | 3018 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,086 psi | 90% | 3091 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,101 psi | 90% | 3081 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,810 psi | 88% | 3107 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,086 psi | 90% | 3081 fps | 96.2% |
| Accurate 4064 | <<locked>> | 92% | 56,202 psi | 90% | 3133 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,895 psi | 85% | 3156 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 86% | 53,650 psi | 86% | 3114 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 54,752 psi | 88% | 3114 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,188 psi | 90% | 3123 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,229 psi | 85% | 3048 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,476 psi | 86% | 3235 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,766 psi | 88% | 3140 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,201 psi | 89% | 3159 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,520 psi | 87% | 3225 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,840 psi | 90% | 3264 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,667 psi | 62% | 2910 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,323 psi | 69% | 3077 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,476 psi | 86% | 3123 fps | 99% |
| Bofors RP3 | <<locked>> | 92% | 55,071 psi | 88% | 3150 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,434 psi | 89% | 3114 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,244 psi | 87% | 3051 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,709 psi | 89% | 3150 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,867 psi | 86% | 3192 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 90% | 52,678 psi | 84% | 3104 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 98% | 56,144 psi | 90% | 3215 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 54,172 psi | 87% | 3127 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,589 psi | 81% | 3087 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,708 psi | 86% | 3159 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 96% | 53,258 psi | 85% | 3182 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 56% | 1949 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,535 psi | 89% | 3133 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 53,954 psi | 87% | 3117 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,099 psi | 87% | 3097 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,230 psi | 87% | 3071 fps | 96.7% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 3140 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,157 psi | 87% | 3097 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,708 psi | 86% | 3150 fps | 99% |
| IMR 4895 | <<locked>> | 88% | 53,098 psi | 85% | 3133 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 56,188 psi | 90% | 3123 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,275 psi | 90% | 3104 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,055 psi | 85% | 3087 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,200 psi | 85% | 3041 fps | 99.6% |
| Lovex S062 | <<locked>> | 90% | 53,896 psi | 86% | 3094 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,243 psi | 85% | 3084 fps | 97.8% |
| Lovex S070 | <<locked>> | 98% | 54,056 psi | 87% | 3117 fps | 97% |
| Norma 201 | <<locked>> | 88% | 55,521 psi | 89% | 3110 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,362 psi | 90% | 3120 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,375 psi | 87% | 3143 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 55,651 psi | 89% | 3202 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 55,274 psi | 89% | 3173 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,665 psi | 88% | 3192 fps | 97.8% |
| Ramshot TAC | <<locked>> | 84% | 52,924 psi | 85% | 3074 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,347 psi | 90% | 3159 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,592 psi | 86% | 3064 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 57% | 1995 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,579 psi | 89% | 3104 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,156 psi | 85% | 3084 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,753 psi | 89% | 3228 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,506 psi | 89% | 3268 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,750 psi | 85% | 3176 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 3271 fps | 99% |
| Rottweil R 901 | <<locked>> | 86% | 56,246 psi | 90% | 3097 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,043 psi | 90% | 3110 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,926 psi | 88% | 3140 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 55,434 psi | 89% | 3114 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,243 psi | 85% | 3084 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,055 psi | 85% | 3087 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,896 psi | 86% | 3094 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,056 psi | 87% | 3117 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,606 psi | 86% | 3153 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,882 psi | 88% | 3110 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,579 psi | 89% | 3136 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,969 psi | 87% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,230 psi | 87% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,563 psi | 86% | 3031 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 53,838 psi | 86% | 3097 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,069 psi | 85% | 2995 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,549 psi | 87% | 3104 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 55,361 psi | 89% | 3140 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,024 psi | 80% | 3146 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,606 psi | 86% | 2969 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,273 psi | 87% | 2992 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,767 psi | 89% | 3074 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,403 psi | 86% | 3041 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,417 psi | 86% | 3064 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,752 psi | 88% | 3146 fps | 99% |
| Vihtavuori N530 | <<locked>> | 84% | 53,040 psi | 85% | 3064 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 90% | 55,158 psi | 88% | 3087 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,766 psi | 86% | 3146 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,192 psi | 68% | 2995 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,419 psi | 89% | 3127 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 52,866 psi | 85% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,391 psi | 90% | 3219 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,461 psi | 55% | 2884 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,622 psi | 89% | 3150 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% | 47,645 psi | 76% | 2913 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,562 psi | 84% | 3035 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,059 psi | 64% | 2815 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,558 psi | 76% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,402 psi | 84% | 3018 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 37,898 psi | 61% | 2802 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 39,610 psi | 64% | 2894 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 44,077 psi | 71% | 2933 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,376 psi | 60% | 2762 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,224 psi | 74% | 2949 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 46,543 psi | 75% | 2946 fps | 100% |
| Alliant Power Pro 2000-MR | 60.5 gr | 80% | 40,132 psi | 64% | 2953 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,985 psi | 59% | 2785 fps | 97.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,769 psi | 64% | 2854 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,144 psi | 60% | 2851 fps | 95.1% |
| Alliant Reloder-17 | 61.1 gr | 82% | 34,243 psi | 55% | 2799 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 33,997 psi | 55% | 2785 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,277 psi | 65% | 3005 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,439 psi | 70% | 2933 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 36,419 psi | 58% | 2782 fps | 97.4% |
| Bofors RP7 | <<locked>> | 94% | 51,953 psi | 83% | 3051 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,892 psi | 77% | 2940 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,063 psi | 72% | 2966 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,995 psi | 80% | 3127 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 40,118 psi | 64% | 2851 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 94% | 48,965 psi | 79% | 3084 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 44,483 psi | 71% | 2946 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,026 psi | 55% | 2733 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,524 psi | 65% | 2907 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 94% | 49,385 psi | 79% | 3110 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 42% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,743 psi | 69% | 2894 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 44,164 psi | 71% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,233 psi | 63% | 2802 fps | 96.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 47,616 psi | 76% | 2949 fps | 95.1% |
| IMR 4350 | <<locked>> | 98% | 52,373 psi | 84% | 3081 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,819 psi | 77% | 2979 fps | 95.1% |
| IMR 4831 | <<locked>> | 90% | 38,232 psi | 61% | 2844 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,727 psi | 65% | 2890 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 46,224 psi | 74% | 2949 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 52,518 psi | 84% | 3045 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,047 psi | 69% | 2910 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 44,251 psi | 71% | 2874 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 39,146 psi | 63% | 2808 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 44,019 psi | 71% | 2910 fps | 95.7% |
| Lovex S070 | <<locked>> | 94% | 47,543 psi | 76% | 2999 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,047 psi | 69% | 2884 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 43,482 psi | 70% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,117 psi | 63% | 2841 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 39,813 psi | 64% | 2897 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 38,798 psi | 62% | 2854 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 44,585 psi | 71% | 3002 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 46,369 psi | 74% | 2953 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,759 psi | 73% | 2972 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,922 psi | 80% | 2999 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 42% | 1785 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,851 psi | 83% | 3045 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 46,398 psi | 74% | 2959 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,032 psi | 67% | 2969 fps | 97.3% |
| ReloadSwiss RS 60 | 59.6 gr | 80% | 34,040 psi | 55% | 2808 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 39,610 psi | 64% | 2917 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,627 psi | 68% | 2995 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 46,847 psi | 75% | 2936 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,915 psi | 66% | 2831 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,243 psi | 55% | 2720 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 94% | 51,953 psi | 83% | 3051 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,019 psi | 71% | 2910 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,047 psi | 69% | 2910 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 39,146 psi | 63% | 2808 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 47,543 psi | 76% | 2999 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,491 psi | 57% | 2776 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,527 psi | 71% | 2920 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,757 psi | 69% | 2900 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,425 psi | 71% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,912 psi | 59% | 2690 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 46,891 psi | 75% | 2913 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 50,096 psi | 80% | 3035 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 44,121 psi | 71% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,193 psi | 71% | 2917 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 35,215 psi | 56% | 2733 fps | 96.4% |
| Somchem S365 | <<locked>> | 84% | 28,935 psi | 46% | 2644 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,256 psi | 81% | 2917 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,802 psi | 72% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,321 psi | 65% | 2818 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,162 psi | 66% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,475 psi | 54% | 2664 fps | 97.3% |
| Vihtavuori N160 | <<locked>> | 88% | 39,044 psi | 63% | 2841 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,267 psi | 74% | 2943 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,552 psi | 63% | 2805 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 38,450 psi | 62% | 2838 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 36,709 psi | 59% | 2867 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,937 psi | 51% | 2635 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 46,151 psi | 74% | 2992 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 49,197 psi | 79% | 3087 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,300 psi | 52% | 2808 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,163 psi | 68% | 2900 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 96 powders for .300 H&H Mag. loaded with the .308 | 140gr | Peregrine VLR5 (VLR-5). ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 1,949 fps to 3,271 fps. Alliant Reloder-16 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 (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 H&H Mag. with the .308 | 140gr | Peregrine VLR5 (VLR-5) 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.