Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 136gr | Geco ZERO 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 Reloder-17 and Alliant Power Pro 2000-MR.
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% | 52,968 psi | 85% | 3038 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,897 psi | 88% | 3114 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,766 psi | 88% | 3104 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,272 psi | 85% | 3120 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,810 psi | 88% | 3150 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,259 psi | 89% | 3232 fps | 98.9% |
| ADI AR 2206H | <<locked>> | 88% | 55,724 psi | 89% | 3189 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 53,635 psi | 86% | 3130 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,810 psi | 88% | 3140 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 55,361 psi | 89% | 3120 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,796 psi | 89% | 3314 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,272 psi | 85% | 3153 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,970 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,998 psi | 87% | 3176 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 3232 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,215 psi | 87% | 3274 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,521 psi | 60% | 2913 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,970 psi | 90% | 3202 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 53,780 psi | 86% | 3166 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,258 psi | 85% | 3071 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,230 psi | 87% | 3166 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,434 psi | 90% | 3278 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 82% | 55,376 psi | 89% | 3140 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,969 psi | 88% | 3179 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 98% | 54,491 psi | 87% | 3222 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 56,275 psi | 90% | 3199 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,052 psi | 79% | 3094 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,985 psi | 90% | 3235 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,898 psi | 90% | 3264 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,114 psi | 56% | 1975 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,157 psi | 87% | 3146 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 56,115 psi | 90% | 3189 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 52,997 psi | 85% | 3114 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,200 psi | 85% | 3087 fps | 96.1% |
| IMR 4198 | <<locked>> | 82% | 56,130 psi | 90% | 3058 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 3153 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,275 psi | 90% | 3166 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 3159 fps | 98.6% |
| IMR 4895 | <<locked>> | 90% | 55,390 psi | 89% | 3212 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 54,810 psi | 88% | 3140 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 54,781 psi | 88% | 3120 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,361 psi | 89% | 3163 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,608 psi | 89% | 3117 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 55,999 psi | 90% | 3163 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,274 psi | 89% | 3153 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3189 fps | 97.1% |
| Norma 201 | <<locked>> | 88% | 54,360 psi | 87% | 3130 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 54,940 psi | 88% | 3136 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,185 psi | 85% | 3159 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 54,302 psi | 87% | 3219 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 90% | 53,751 psi | 86% | 3186 fps | 99.4% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,345 psi | 86% | 3209 fps | 97.2% |
| Ramshot TAC | <<locked>> | 86% | 55,405 psi | 89% | 3150 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,882 psi | 88% | 3173 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,883 psi | 90% | 3140 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 57% | 2018 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,201 psi | 87% | 3120 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,463 psi | 89% | 3159 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,360 psi | 87% | 3248 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,201 psi | 87% | 3284 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,926 psi | 88% | 3248 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 3281 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,100 psi | 88% | 3117 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,897 psi | 88% | 3130 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 94% | 53,635 psi | 86% | 3156 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,274 psi | 89% | 3153 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,361 psi | 89% | 3163 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,999 psi | 90% | 3163 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3189 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,825 psi | 90% | 3225 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,679 psi | 86% | 3123 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,404 psi | 87% | 3156 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 56,231 psi | 90% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 52,881 psi | 85% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,043 psi | 90% | 3107 fps | 96.7% |
| Somchem S321 | <<locked>> | 84% | 56,144 psi | 90% | 3173 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,419 psi | 89% | 3071 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,359 psi | 86% | 3120 fps | 99.4% |
| Somchem S355 | <<locked>> | 94% | 54,157 psi | 87% | 3156 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,617 psi | 78% | 3159 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 55,825 psi | 90% | 3041 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,939 psi | 85% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,520 psi | 87% | 3097 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,738 psi | 89% | 3117 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,767 psi | 89% | 3140 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,214 psi | 85% | 3156 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 86% | 55,448 psi | 89% | 3143 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,998 psi | 87% | 3107 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,014 psi | 90% | 3219 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,901 psi | 66% | 3002 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,012 psi | 87% | 3136 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 55,405 psi | 89% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,752 psi | 88% | 3225 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,128 psi | 87% | 3163 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% | 46,630 psi | 75% | 2933 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,198 psi | 82% | 3051 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,827 psi | 62% | 2825 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,441 psi | 74% | 3002 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,724 psi | 59% | 2808 fps | 99.4% |
| Accurate 4350 | <<locked>> | 90% | 38,479 psi | 62% | 2900 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 43,134 psi | 69% | 2949 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,579 psi | 59% | 2776 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,237 psi | 73% | 2966 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 45,150 psi | 72% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | 60.4 gr | 80% | 39,233 psi | 63% | 2959 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,085 psi | 58% | 2799 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,649 psi | 84% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,812 psi | 62% | 2867 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 90% | 38,537 psi | 62% | 2917 fps | 95.2% |
| Alliant Reloder-17 | 62.4 gr | 84% | 35,679 psi | 57% | 2871 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,172 psi | 56% | 2851 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,438 psi | 68% | 2943 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 35,476 psi | 57% | 2792 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,978 psi | 75% | 2959 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,019 psi | 71% | 2979 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,747 psi | 78% | 3140 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,808 psi | 83% | 3084 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,843 psi | 67% | 2923 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 51,010 psi | 82% | 3159 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 43,511 psi | 70% | 2959 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,996 psi | 53% | 2736 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,479 psi | 63% | 2917 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 96% | 51,793 psi | 83% | 3189 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,005 psi | 42% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,814 psi | 67% | 2910 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 43,018 psi | 69% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,334 psi | 61% | 2815 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,763 psi | 80% | 3022 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 52,765 psi | 85% | 3009 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 51,227 psi | 82% | 3094 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 92% | 49,647 psi | 80% | 3048 fps | 95.2% |
| IMR 4831 | <<locked>> | 92% | 39,798 psi | 64% | 2913 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,769 psi | 64% | 2904 fps | 97% |
| IMR 8208 XBR | <<locked>> | 80% | 45,237 psi | 73% | 2966 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 51,097 psi | 82% | 3058 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,974 psi | 67% | 2923 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 43,221 psi | 69% | 2887 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 38,058 psi | 61% | 2818 fps | 97.8% |
| Lovex S065 | <<locked>> | 90% | 43,033 psi | 69% | 2920 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 49,559 psi | 79% | 3071 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,916 psi | 67% | 2894 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 42,482 psi | 68% | 2913 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 38,203 psi | 61% | 2854 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 38,769 psi | 62% | 2904 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,826 psi | 61% | 2864 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 46,398 psi | 74% | 3074 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 45,208 psi | 72% | 2959 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,744 psi | 72% | 2986 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,950 psi | 78% | 3018 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 42% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,836 psi | 82% | 3064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 48,617 psi | 78% | 3035 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,654 psi | 65% | 2976 fps | 96.6% |
| ReloadSwiss RS 60 | 59.5 gr | 80% | 33,214 psi | 53% | 2815 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,205 psi | 66% | 2986 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,425 psi | 71% | 3068 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,658 psi | 73% | 2953 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,827 psi | 64% | 2841 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,315 psi | 53% | 2726 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,033 psi | 69% | 2920 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,974 psi | 67% | 2923 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 38,058 psi | 61% | 2818 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 96% | 49,559 psi | 79% | 3071 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,985 psi | 59% | 2848 fps | 96% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,337 psi | 69% | 2927 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,626 psi | 67% | 2910 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,569 psi | 70% | 2861 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,085 psi | 58% | 2707 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 48,791 psi | 78% | 2982 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 49,008 psi | 79% | 3051 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 43,004 psi | 69% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,192 psi | 69% | 2930 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 34,185 psi | 55% | 2736 fps | 95.6% |
| Somchem S365 | <<locked>> | 86% | 30,110 psi | 48% | 2713 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 49,313 psi | 79% | 2940 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,903 psi | 70% | 2861 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,349 psi | 63% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,219 psi | 64% | 2841 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,634 psi | 52% | 2674 fps | 96.6% |
| Vihtavuori N160 | <<locked>> | 90% | 40,683 psi | 65% | 2910 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 45,310 psi | 73% | 2959 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,667 psi | 62% | 2822 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 40,030 psi | 64% | 2910 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 38,174 psi | 61% | 2936 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,272 psi | 53% | 2700 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 44,860 psi | 72% | 3005 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 51,271 psi | 82% | 3163 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,176 psi | 66% | 2913 fps | 97.9% |
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 | Geco ZERO. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,314 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 Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .300 H&H Mag. with the .308 | 136gr | Geco ZERO 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.