Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 122gr | Sax KJG-SX bullet and 86 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>> | 86% | 54,375 psi | 87% | 3212 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,420 psi | 90% | 3281 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 56,115 psi | 90% | 3274 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,752 psi | 88% | 3291 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 55,956 psi | 90% | 3317 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 3317 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 88% | 53,592 psi | 86% | 3294 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 94% | 54,549 psi | 87% | 3287 fps | 98.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,101 psi | 90% | 3307 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 88% | 56,318 psi | 90% | 3294 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,099 psi | 87% | 3366 fps | 99.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,026 psi | 85% | 3402 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,259 psi | 87% | 3314 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,737 psi | 86% | 3219 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,839 psi | 88% | 3333 fps | 98.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,488 psi | 81% | 3317 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,245 psi | 89% | 3435 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,028 psi | 90% | 3186 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,432 psi | 86% | 3297 fps | 98% |
| Bofors RP3 | <<locked>> | 94% | 54,795 psi | 88% | 3327 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,549 psi | 87% | 3238 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,492 psi | 89% | 3333 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,330 psi | 86% | 3369 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 82% | 53,026 psi | 85% | 3255 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,259 psi | 87% | 3278 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,028 psi | 90% | 3333 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 88% | 54,070 psi | 87% | 3307 fps | 99.2% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,470 psi | 75% | 3179 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,171 psi | 85% | 3333 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,809 psi | 56% | 2077 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,405 psi | 89% | 3314 fps | 99.3% |
| IMR 3031 | <<locked>> | 88% | 53,330 psi | 86% | 3304 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,940 psi | 86% | 3271 fps | 98.5% |
| IMR 4198 | <<locked>> | 82% | 53,882 psi | 86% | 3182 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,284 psi | 79% | 3241 fps | 97.1% |
| IMR 4895 | <<locked>> | 92% | 56,217 psi | 90% | 3373 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 88% | 56,101 psi | 90% | 3307 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 82% | 52,533 psi | 84% | 3228 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 88% | 52,953 psi | 85% | 3271 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,476 psi | 86% | 3222 fps | 98.8% |
| Lovex S062 | <<locked>> | 92% | 53,519 psi | 86% | 3268 fps | 99.6% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3307 fps | 97.1% |
| Norma 201 | <<locked>> | 90% | 55,608 psi | 89% | 3297 fps | 99.7% |
| Norma 202 | <<locked>> | 90% | 55,999 psi | 90% | 3304 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,998 psi | 87% | 3317 fps | 98.9% |
| Norma URPᴾ | <<locked>> | 100% | 51,343 psi | 82% | 3301 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 92% | 54,636 psi | 88% | 3343 fps | 98.9% |
| Ramshot TAC | <<locked>> | 86% | 53,214 psi | 85% | 3248 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,130 psi | 90% | 3337 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,838 psi | 86% | 3245 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,215 psi | 56% | 2126 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,622 psi | 89% | 3291 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,085 psi | 88% | 3406 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,056 psi | 88% | 3448 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,779 psi | 83% | 3333 fps | 97.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,170 psi | 84% | 3356 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 88% | 56,434 psi | 90% | 3287 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 56,159 psi | 90% | 3294 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 96% | 54,636 psi | 88% | 3317 fps | 99.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,362 psi | 90% | 3307 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 52,953 psi | 85% | 3271 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,519 psi | 86% | 3268 fps | 99.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,332 psi | 89% | 3251 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 52,982 psi | 85% | 3320 fps | 98.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,723 psi | 88% | 3245 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,085 psi | 88% | 3284 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,448 psi | 89% | 3314 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,838 psi | 86% | 3186 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,012 psi | 87% | 3179 fps | 100% |
| Somchem S321 | <<locked>> | 84% | 53,896 psi | 86% | 3281 fps | 99.7% |
| Somchem S335 | <<locked>> | 88% | 53,287 psi | 85% | 3182 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,549 psi | 87% | 3278 fps | 98.9% |
| Somchem S355 | <<locked>> | 96% | 54,969 psi | 88% | 3314 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,890 psi | 74% | 3241 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 84% | 53,606 psi | 86% | 3159 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,925 psi | 86% | 3176 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,274 psi | 89% | 3264 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,243 psi | 85% | 3225 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,214 psi | 85% | 3238 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 3307 fps | 97.8% |
| Vihtavuori N530 | <<locked>> | 86% | 53,084 psi | 85% | 3245 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 92% | 55,114 psi | 88% | 3271 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 3307 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,100 psi | 88% | 3291 fps | 99.5% |
| Winchester 748 | <<locked>> | 88% | 56,362 psi | 90% | 3356 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,347 psi | 89% | 3327 fps | 99.4% |
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% | 44,846 psi | 72% | 3048 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,269 psi | 79% | 3163 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 37,594 psi | 60% | 2936 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,266 psi | 71% | 3097 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 35,505 psi | 57% | 2907 fps | 98.5% |
| Accurate 4350 | <<locked>> | 94% | 42,061 psi | 67% | 3114 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 41,307 psi | 66% | 3038 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 84% | 39,856 psi | 64% | 2982 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,323 psi | 69% | 3061 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 43,033 psi | 69% | 3077 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,444 psi | 81% | 3297 fps | 98.8% |
| Alliant Power Pro 2000-MR | 64.1 gr | 84% | 42,989 psi | 69% | 3179 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,854 psi | 59% | 2943 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,618 psi | 81% | 3166 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 39,769 psi | 64% | 3018 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 96% | 44,469 psi | 71% | 3186 fps | 95.9% |
| Alliant Reloder-17 | 66.2 gr | 88% | 39,233 psi | 63% | 3087 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,605 psi | 84% | 3133 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 43,337 psi | 69% | 3094 fps | 95.6% |
| Bofors RP3 | <<locked>> | 82% | 36,390 psi | 58% | 2943 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,397 psi | 73% | 3064 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,076 psi | 67% | 3074 fps | 98.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,137 psi | 74% | 3225 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 80% | 49,661 psi | 80% | 3199 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,720 psi | 81% | 3219 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 45,803 psi | 73% | 3140 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 41,669 psi | 67% | 3054 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 38,421 psi | 62% | 2999 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,666 psi | 60% | 3002 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,875 psi | 41% | 1860 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,001 psi | 64% | 2999 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 40,901 psi | 66% | 3071 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 39,262 psi | 63% | 2963 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 50,763 psi | 81% | 3133 fps | 100% |
| IMR 4831 | <<locked>> | 96% | 43,221 psi | 69% | 3120 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 38,029 psi | 61% | 2986 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 43,323 psi | 69% | 3061 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 49,110 psi | 79% | 3166 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 40,205 psi | 64% | 3018 fps | 98.7% |
| Lovex S060 | <<locked>> | 80% | 41,785 psi | 67% | 2982 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 36,738 psi | 59% | 2910 fps | 96.3% |
| Lovex S065 | <<locked>> | 96% | 49,792 psi | 80% | 3186 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 40,567 psi | 65% | 2995 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 40,727 psi | 65% | 3012 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 39,102 psi | 63% | 3005 fps | 95.6% |
| Norma URP | <<locked>> | 96% | 45,049 psi | 72% | 3176 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 82% | 38,696 psi | 62% | 3012 fps | 95.2% |
| Ramshot TAC | <<locked>> | 84% | 49,661 psi | 80% | 3179 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,815 psi | 69% | 3074 fps | 96.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,079 psi | 75% | 3114 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,165 psi | 42% | 1906 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,834 psi | 78% | 3169 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,510 psi | 67% | 3130 fps | 95.6% |
| ReloadSwiss RS 60 | 60.1 gr | 80% | 31,778 psi | 51% | 2881 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 44,918 psi | 72% | 3192 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 48,733 psi | 78% | 3284 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 44,411 psi | 71% | 3064 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 38,624 psi | 62% | 2940 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 36,463 psi | 58% | 2936 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 49,792 psi | 80% | 3186 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,205 psi | 64% | 3018 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 36,738 psi | 59% | 2910 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,706 psi | 83% | 3189 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,350 psi | 65% | 3058 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,256 psi | 82% | 3189 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 44,498 psi | 71% | 3081 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,972 psi | 64% | 2999 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,974 psi | 67% | 2963 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,693 psi | 56% | 2799 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 46,978 psi | 75% | 3150 fps | 98.9% |
| Somchem S335 | <<locked>> | 80% | 41,611 psi | 67% | 2966 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 41,278 psi | 66% | 3015 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 37,507 psi | 60% | 2949 fps | 95.6% |
| Somchem S365 | <<locked>> | 90% | 32,851 psi | 53% | 2910 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 47,471 psi | 76% | 3058 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,177 psi | 68% | 2969 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,608 psi | 60% | 2933 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,464 psi | 62% | 2936 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 33,402 psi | 54% | 2815 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 94% | 44,208 psi | 71% | 3117 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 43,526 psi | 70% | 3058 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 37,173 psi | 60% | 2913 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 94% | 43,439 psi | 70% | 3114 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,738 psi | 59% | 2904 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 42,772 psi | 69% | 3100 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,204 psi | 63% | 2995 fps | 96.3% |
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 86 powders for .300 H&H Mag. loaded with the .308 | 122gr | Sax KJG-SX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,448 fps; across all powders the maximum-charge window runs from 2,077 fps to 3,448 fps. Accurate 4350 gives the best case fill at 100 %, and 86 of the 86 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 122.0 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, Hodgdon Hybrid 100V 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 | 122gr | Sax KJG-SX 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.