Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 136gr | Peregrine Plainsmaster (VLR-4) 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 60, Alliant Power Pro 2000-MR 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% | 53,258 psi | 85% | 3041 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,926 psi | 88% | 3114 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,781 psi | 88% | 3107 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,577 psi | 86% | 3127 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,897 psi | 88% | 3153 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,230 psi | 89% | 3232 fps | 99% |
| ADI AR 2206H | <<locked>> | 88% | 55,999 psi | 90% | 3192 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 53,679 psi | 86% | 3133 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,114 psi | 88% | 3146 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 55,695 psi | 89% | 3127 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,057 psi | 90% | 3320 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,563 psi | 86% | 3156 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,014 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,027 psi | 87% | 3179 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,287 psi | 85% | 3238 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,476 psi | 87% | 3281 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,724 psi | 60% | 2920 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,999 psi | 90% | 3202 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 53,780 psi | 86% | 3166 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,287 psi | 85% | 3074 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,491 psi | 87% | 3173 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,605 psi | 84% | 3212 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 82% | 55,651 psi | 89% | 3146 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,984 psi | 88% | 3179 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 98% | 54,723 psi | 88% | 3228 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 86% | 53,069 psi | 85% | 3146 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,313 psi | 79% | 3100 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,275 psi | 90% | 3241 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,115 psi | 90% | 3268 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,027 psi | 56% | 1975 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,447 psi | 87% | 3153 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 56,405 psi | 90% | 3196 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,011 psi | 85% | 3114 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,229 psi | 85% | 3087 fps | 96.1% |
| IMR 4198 | <<locked>> | 82% | 56,173 psi | 90% | 3061 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3156 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,113 psi | 85% | 3110 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 3159 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 55,405 psi | 89% | 3212 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 55,114 psi | 88% | 3146 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 55,085 psi | 88% | 3127 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,651 psi | 89% | 3166 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,651 psi | 89% | 3117 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 56,275 psi | 90% | 3169 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,535 psi | 89% | 3159 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3192 fps | 97.1% |
| Norma 201 | <<locked>> | 88% | 54,418 psi | 87% | 3133 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 55,216 psi | 89% | 3143 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,200 psi | 85% | 3163 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 54,288 psi | 87% | 3219 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 90% | 53,998 psi | 87% | 3189 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,345 psi | 86% | 3209 fps | 97.2% |
| Ramshot TAC | <<locked>> | 86% | 55,405 psi | 89% | 3153 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,926 psi | 88% | 3176 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,159 psi | 90% | 3143 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 57% | 2021 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,505 psi | 87% | 3127 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,724 psi | 89% | 3166 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,404 psi | 87% | 3248 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,186 psi | 87% | 3287 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,187 psi | 88% | 3255 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 3281 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,158 psi | 88% | 3120 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,911 psi | 88% | 3130 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 53,635 psi | 86% | 3156 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,535 psi | 89% | 3159 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,651 psi | 89% | 3166 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,275 psi | 90% | 3169 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3192 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,854 psi | 90% | 3225 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,708 psi | 86% | 3127 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,447 psi | 87% | 3159 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,275 psi | 90% | 3081 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,171 psi | 85% | 3022 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,985 psi | 90% | 3107 fps | 96.7% |
| Somchem S321 | <<locked>> | 84% | 56,434 psi | 90% | 3179 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,405 psi | 89% | 3071 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,388 psi | 86% | 3123 fps | 99.4% |
| Somchem S355 | <<locked>> | 94% | 54,157 psi | 87% | 3159 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,602 psi | 78% | 3159 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,840 psi | 90% | 3041 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,953 psi | 85% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,549 psi | 87% | 3100 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,753 psi | 89% | 3117 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,753 psi | 89% | 3140 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,447 psi | 86% | 3163 fps | 98.6% |
| Vihtavuori N530 | <<locked>> | 86% | 55,492 psi | 89% | 3143 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,041 psi | 87% | 3110 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,246 psi | 90% | 3225 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,930 psi | 66% | 3002 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,201 psi | 87% | 3143 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 55,448 psi | 89% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,042 psi | 88% | 3232 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,418 psi | 87% | 3166 fps | 99.8% |
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% | 46,688 psi | 75% | 2936 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,256 psi | 82% | 3054 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,073 psi | 63% | 2831 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,470 psi | 75% | 3005 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,956 psi | 59% | 2815 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 38,493 psi | 62% | 2904 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 43,163 psi | 69% | 2949 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,608 psi | 59% | 2776 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,310 psi | 73% | 2966 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 45,440 psi | 73% | 2969 fps | 100% |
| Alliant Power Pro 2000-MR | 60.5 gr | 80% | 39,233 psi | 63% | 2963 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,129 psi | 58% | 2799 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,678 psi | 84% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,870 psi | 62% | 2871 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,537 psi | 62% | 2917 fps | 95.2% |
| Alliant Reloder-17 | 61.1 gr | 82% | 33,431 psi | 54% | 2808 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,346 psi | 57% | 2854 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,482 psi | 68% | 2946 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 35,520 psi | 57% | 2792 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,021 psi | 75% | 2963 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,048 psi | 71% | 2982 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,762 psi | 78% | 3140 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,866 psi | 83% | 3084 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,872 psi | 67% | 2923 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 51,053 psi | 82% | 3159 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 43,555 psi | 70% | 2966 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 33,170 psi | 53% | 2743 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,537 psi | 63% | 2920 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 96% | 52,011 psi | 83% | 3196 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,933 psi | 42% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,872 psi | 67% | 2910 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 43,105 psi | 69% | 2969 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,406 psi | 62% | 2818 fps | 96.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,980 psi | 80% | 3028 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,852 psi | 85% | 3012 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 51,242 psi | 82% | 3094 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,647 psi | 80% | 3051 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 39,813 psi | 64% | 2917 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 39,813 psi | 64% | 2904 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 45,310 psi | 73% | 2966 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 51,140 psi | 82% | 3061 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,018 psi | 67% | 2927 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 43,453 psi | 70% | 2894 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 38,290 psi | 61% | 2825 fps | 97.9% |
| Lovex S065 | <<locked>> | 90% | 43,062 psi | 69% | 2923 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 49,574 psi | 79% | 3071 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,163 psi | 68% | 2900 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 42,554 psi | 68% | 2917 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 38,232 psi | 61% | 2858 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 38,812 psi | 62% | 2907 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,869 psi | 61% | 2864 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 46,644 psi | 75% | 3081 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 45,455 psi | 73% | 2966 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,773 psi | 72% | 2989 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,979 psi | 79% | 3018 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,237 psi | 42% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,850 psi | 82% | 3064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,646 psi | 78% | 3035 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,930 psi | 66% | 2982 fps | 96.7% |
| ReloadSwiss RS 60 | 59.6 gr | 80% | 33,257 psi | 53% | 2818 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,423 psi | 66% | 2992 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,643 psi | 72% | 3074 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 45,919 psi | 74% | 2959 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,074 psi | 64% | 2848 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 33,388 psi | 54% | 2733 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,062 psi | 69% | 2923 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,018 psi | 67% | 2927 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 38,290 psi | 61% | 2825 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 96% | 49,574 psi | 79% | 3071 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,664 psi | 56% | 2789 fps | 95% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,337 psi | 69% | 2930 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,829 psi | 67% | 2913 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,584 psi | 70% | 2864 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,129 psi | 58% | 2710 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 49,066 psi | 79% | 2989 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 49,066 psi | 79% | 3054 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 43,236 psi | 69% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,221 psi | 69% | 2930 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 34,403 psi | 55% | 2746 fps | 95.7% |
| Somchem S365 | <<locked>> | 86% | 30,153 psi | 48% | 2713 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 49,342 psi | 79% | 2943 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,932 psi | 70% | 2864 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,378 psi | 63% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,277 psi | 65% | 2844 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,692 psi | 52% | 2677 fps | 96.7% |
| Vihtavuori N160 | <<locked>> | 90% | 40,698 psi | 65% | 2913 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 45,324 psi | 73% | 2963 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,696 psi | 62% | 2822 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 40,074 psi | 64% | 2913 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 98% | 38,174 psi | 61% | 2940 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,417 psi | 54% | 2707 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 45,092 psi | 72% | 3012 fps | 99.6% |
| Winchester 760 | <<locked>> | 94% | 47,993 psi | 77% | 3100 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,220 psi | 66% | 2917 fps | 98% |
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 94 powders for .300 H&H Mag. loaded with the .308 | 136gr | Peregrine Plainsmaster (VLR-4). Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,320 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 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 136.0 gr projectile in 0.308" calls for a 1:12.5 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, Alliant Reloder-17 rank at the top here: for .300 H&H Mag. with the .308 | 136gr | Peregrine Plainsmaster (VLR-4) 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.