Load Specifications
Load data in caliber .300 H&H Mag. with .310 | 123gr | Hornady SST bullet and 88 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>> | 86% | 56,231 psi | 90% | 3235 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,665 psi | 88% | 3251 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,621 psi | 88% | 3248 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,982 psi | 85% | 3258 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,694 psi | 88% | 3294 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 3353 fps | 98.2% |
| ADI AR 2206H | <<locked>> | 88% | 55,347 psi | 89% | 3323 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 94% | 56,420 psi | 90% | 3317 fps | 98.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,302 psi | 87% | 3274 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 86% | 54,926 psi | 88% | 3264 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,057 psi | 90% | 3399 fps | 99.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,143 psi | 88% | 3442 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,318 psi | 90% | 3343 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,680 psi | 89% | 3245 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,490 psi | 86% | 3304 fps | 98.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,388 psi | 84% | 3356 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,780 psi | 86% | 3406 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,245 psi | 89% | 3327 fps | 98.5% |
| Bofors RP3 | <<locked>> | 92% | 53,403 psi | 86% | 3301 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,260 psi | 90% | 3264 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,824 psi | 86% | 3301 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,521 psi | 89% | 3406 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,839 psi | 88% | 3281 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,086 psi | 90% | 3304 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,476 psi | 87% | 3304 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 88% | 55,898 psi | 90% | 3340 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,515 psi | 78% | 3219 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,245 psi | 89% | 3366 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,983 psi | 56% | 2083 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,780 psi | 86% | 3281 fps | 99.3% |
| IMR 3031 | <<locked>> | 88% | 55,550 psi | 89% | 3330 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,970 psi | 90% | 3304 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,057 psi | 90% | 3271 fps | 95.9% |
| IMR 4198 | <<locked>> | 82% | 55,405 psi | 89% | 3202 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 3284 fps | 97.9% |
| IMR 4895 | <<locked>> | 90% | 54,853 psi | 88% | 3346 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 86% | 54,302 psi | 87% | 3274 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 82% | 54,621 psi | 88% | 3258 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,100 psi | 88% | 3301 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,940 psi | 88% | 3245 fps | 99.2% |
| Lovex S062 | <<locked>> | 92% | 55,564 psi | 89% | 3301 fps | 99.8% |
| Lovex S065 | <<locked>> | 98% | 54,940 psi | 88% | 3284 fps | 97.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 3314 fps | 96.1% |
| Norma 201 | <<locked>> | 88% | 54,056 psi | 87% | 3268 fps | 99.7% |
| Norma 202 | <<locked>> | 88% | 54,462 psi | 87% | 3274 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,999 psi | 90% | 3350 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 53,461 psi | 86% | 3340 fps | 98% |
| Ramshot Big Game | <<locked>> | 90% | 53,185 psi | 85% | 3310 fps | 98.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,779 psi | 85% | 3327 fps | 96.2% |
| Ramshot TAC | <<locked>> | 86% | 54,998 psi | 88% | 3278 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,433 psi | 87% | 3304 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,419 psi | 89% | 3271 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,418 psi | 57% | 2133 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,882 psi | 86% | 3261 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,027 psi | 88% | 3284 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,548 psi | 86% | 3373 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,374 psi | 86% | 3415 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 3376 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 3402 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 86% | 54,824 psi | 88% | 3258 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,563 psi | 87% | 3264 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 94% | 53,258 psi | 85% | 3287 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,940 psi | 88% | 3284 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,100 psi | 88% | 3301 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,564 psi | 89% | 3301 fps | 99.8% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 3314 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,143 psi | 88% | 3356 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,084 psi | 85% | 3248 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,824 psi | 86% | 3284 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,753 psi | 89% | 3215 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,970 psi | 90% | 3205 fps | 100% |
| Somchem S321 | <<locked>> | 84% | 55,883 psi | 90% | 3310 fps | 99.9% |
| Somchem S335 | <<locked>> | 88% | 55,056 psi | 88% | 3209 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,634 psi | 84% | 3245 fps | 98.8% |
| Somchem S355 | <<locked>> | 94% | 53,563 psi | 86% | 3287 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,892 psi | 77% | 3278 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 84% | 55,361 psi | 89% | 3182 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,869 psi | 90% | 3202 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,099 psi | 87% | 3238 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,027 psi | 88% | 3248 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,143 psi | 88% | 3268 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,202 psi | 90% | 3343 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 86% | 54,897 psi | 88% | 3274 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 90% | 53,447 psi | 86% | 3238 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,274 psi | 89% | 3343 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,577 psi | 86% | 3261 fps | 99.5% |
| Winchester 748 | <<locked>> | 86% | 54,752 psi | 88% | 3327 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,664 psi | 86% | 3291 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% | 46,383 psi | 74% | 3071 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,923 psi | 82% | 3189 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,117 psi | 63% | 2963 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,108 psi | 74% | 3130 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 36,970 psi | 59% | 2940 fps | 99% |
| Accurate 4350 | <<locked>> | 92% | 40,930 psi | 66% | 3084 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 42,830 psi | 69% | 3071 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 41,249 psi | 66% | 3012 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,904 psi | 72% | 3091 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 44,802 psi | 72% | 3100 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,359 psi | 84% | 3330 fps | 99.2% |
| Alliant Power Pro 2000-MR | 64.4 gr | 82% | 41,640 psi | 67% | 3146 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,810 psi | 57% | 2913 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,272 psi | 84% | 3189 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,609 psi | 62% | 2986 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,799 psi | 65% | 3094 fps | 95% |
| Alliant Reloder-17 | 66.5 gr | 86% | 38,000 psi | 61% | 3051 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,090 psi | 67% | 3064 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 35,375 psi | 57% | 2910 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,688 psi | 75% | 3091 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,598 psi | 70% | 3104 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,080 psi | 77% | 3261 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 51,198 psi | 82% | 3219 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,315 psi | 84% | 3238 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 44,585 psi | 71% | 3110 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,207 psi | 69% | 3084 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 37,376 psi | 60% | 2969 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,131 psi | 63% | 3035 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 42% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,452 psi | 66% | 3031 fps | 97.1% |
| IMR 3031 | <<locked>> | 80% | 42,540 psi | 68% | 3097 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,232 psi | 61% | 2933 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 88% | 52,605 psi | 84% | 3209 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 52,214 psi | 84% | 3153 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 42,250 psi | 68% | 3091 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,523 psi | 63% | 3022 fps | 96% |
| IMR 8208 XBR | <<locked>> | 80% | 44,904 psi | 72% | 3091 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 50,952 psi | 82% | 3196 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 41,814 psi | 67% | 3051 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 43,018 psi | 69% | 3009 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 38,043 psi | 61% | 2943 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 48,486 psi | 78% | 3159 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 52,475 psi | 84% | 3255 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 41,959 psi | 67% | 3025 fps | 98% |
| Norma 202 | <<locked>> | 80% | 42,119 psi | 68% | 3038 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 37,985 psi | 61% | 2972 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 43,947 psi | 70% | 3150 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 37,463 psi | 60% | 2972 fps | 95% |
| Ramshot Hunter | <<locked>> | 98% | 49,211 psi | 79% | 3258 fps | 95.3% |
| Ramshot TAC | <<locked>> | 82% | 48,080 psi | 77% | 3146 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,266 psi | 71% | 3104 fps | 97.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,660 psi | 78% | 3146 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,397 psi | 42% | 1916 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,473 psi | 81% | 3199 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 51,372 psi | 82% | 3219 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,248 psi | 65% | 3094 fps | 95.4% |
| ReloadSwiss RS 60 | 61.9 gr | 80% | 33,083 psi | 53% | 2923 fps | 96.4% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 43,758 psi | 70% | 3166 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 47,311 psi | 76% | 3251 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,687 psi | 73% | 3087 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 39,958 psi | 64% | 2969 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 35,607 psi | 57% | 2907 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 48,486 psi | 78% | 3159 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,814 psi | 67% | 3051 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 38,043 psi | 61% | 2943 fps | 97% |
| Shooters World SW4350 | <<locked>> | 98% | 52,475 psi | 84% | 3255 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 39,392 psi | 63% | 3031 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 46,325 psi | 74% | 3117 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,365 psi | 66% | 3028 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,352 psi | 70% | 2992 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,926 psi | 58% | 2825 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 48,689 psi | 78% | 3182 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 42,946 psi | 69% | 2989 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 42,873 psi | 69% | 3051 fps | 96.9% |
| Somchem S355 | <<locked>> | 82% | 36,593 psi | 59% | 2920 fps | 95.6% |
| Somchem S365 | <<locked>> | 88% | 32,097 psi | 51% | 2884 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,950 psi | 78% | 3077 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,584 psi | 70% | 2992 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,146 psi | 63% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,001 psi | 64% | 2966 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 32,605 psi | 52% | 2789 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 92% | 42,975 psi | 69% | 3087 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 44,875 psi | 72% | 3084 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 38,551 psi | 62% | 2943 fps | 99% |
| Vihtavuori N550 | <<locked>> | 92% | 42,424 psi | 68% | 3087 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,520 psi | 57% | 2871 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 44,541 psi | 71% | 3133 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,799 psi | 65% | 3031 fps | 97% |
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 88 powders for .300 H&H Mag. loaded with the .310 | 123gr | Hornady SST. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,442 fps; across all powders the maximum-charge window runs from 2,083 fps to 3,442 fps. Accurate 4350 gives the best case fill at 100 %, and 88 of the 88 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 123.0 gr projectile in 0.31" calls for a 1:15.5 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .300 H&H Mag. with the .310 | 123gr | Hornady SST 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.