Load Specifications
Load data in caliber 7-.300 Norma Mag. with .284 | 135gr | Atomic 29 HP bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 56,347 psi | 88% | 3212 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,724 psi | 89% | 3241 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,288 psi | 87% | 3317 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 86% | 54,056 psi | 85% | 3248 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 90% | 55,985 psi | 88% | 3317 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 98% | 54,433 psi | 85% | 3281 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 3304 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,215 psi | 85% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,406 psi | 90% | 3297 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,376 psi | 88% | 3314 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 90% | 54,302 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,244 psi | 85% | 3291 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,853 psi | 86% | 3310 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,159 psi | 88% | 3373 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,826 psi | 89% | 3268 fps | 97.3% |
| Bofors RP15 | <<locked>> | 92% | 55,564 psi | 87% | 3297 fps | 99.7% |
| Bofors RP30 | <<locked>> | 96% | 54,012 psi | 85% | 3294 fps | 99.3% |
| Bofors RP5 | <<locked>> | 90% | 56,376 psi | 88% | 3314 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 96% | 55,985 psi | 88% | 3310 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 88% | 55,434 psi | 87% | 3248 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 54,244 psi | 85% | 3228 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,447 psi | 85% | 3159 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,971 psi | 89% | 3442 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 59% | 2106 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,666 psi | 89% | 3228 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,130 psi | 90% | 3232 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,927 psi | 88% | 3225 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 90% | 54,302 psi | 85% | 3297 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,269 psi | 76% | 3202 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 56,797 psi | 89% | 3202 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,187 psi | 86% | 3199 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 54,346 psi | 85% | 3182 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,041 psi | 85% | 3225 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 48,965 psi | 77% | 3232 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 56,507 psi | 89% | 3333 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,984 psi | 86% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,259 psi | 87% | 3320 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 84% | 57,725 psi | 90% | 3284 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 53,708 psi | 84% | 3241 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 2156 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,942 psi | 89% | 3264 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,622 psi | 87% | 3294 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 53,983 psi | 85% | 3363 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,624 psi | 90% | 3386 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 54,810 psi | 86% | 3215 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 88% | 56,898 psi | 89% | 3284 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,797 psi | 89% | 3202 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,187 psi | 86% | 3199 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,782 psi | 87% | 3153 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,507 psi | 89% | 3281 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 56,376 psi | 88% | 3202 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 56,304 psi | 88% | 3225 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,348 psi | 90% | 3255 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,463 psi | 88% | 3209 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,203 psi | 90% | 3232 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,883 psi | 88% | 3215 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,304 psi | 88% | 3255 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,999 psi | 88% | 3333 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 94% | 56,594 psi | 89% | 3314 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 96% | 53,954 psi | 85% | 3314 fps | 97.9% |
| Vihtavuori N570 | <<locked>> | 98% | 55,100 psi | 86% | 3379 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,188 psi | 88% | 3153 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,682 psi | 90% | 3373 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,435 psi | 90% | 3248 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,118 psi | 63% | 2904 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 53,040 psi | 83% | 3182 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,556 psi | 70% | 3100 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,092 psi | 69% | 3048 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 39,479 psi | 62% | 2972 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 38,595 psi | 60% | 2940 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 30,690 psi | 48% | 2759 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,705 psi | 79% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,063 psi | 69% | 3041 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,074 psi | 63% | 2979 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,769 psi | 61% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,489 psi | 52% | 2838 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,569 psi | 68% | 3100 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,996 psi | 81% | 3294 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 50,183 psi | 79% | 3143 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 37,275 psi | 58% | 2907 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 38,247 psi | 60% | 2956 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,074 psi | 63% | 2979 fps | 97% |
| Hodgdon H1000 | <<locked>> | 84% | 36,622 psi | 57% | 2894 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 42,090 psi | 66% | 2979 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,307 psi | 65% | 2959 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,674 psi | 75% | 3048 fps | 100% |
| Hodgdon Retumbo | 75.9 gr | 82% | 35,070 psi | 55% | 2940 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,792 psi | 78% | 3107 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 50,082 psi | 78% | 3114 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,337 psi | 68% | 2976 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 40,988 psi | 64% | 3018 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,204 psi | 61% | 2999 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,374 psi | 84% | 3146 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,822 psi | 81% | 3140 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,519 psi | 54% | 2769 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 50,488 psi | 79% | 3159 fps | 99% |
| Norma 217 | <<locked>> | 88% | 32,010 psi | 50% | 2818 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 42,380 psi | 66% | 3058 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 51,517 psi | 81% | 3159 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,014 psi | 60% | 2953 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 50,488 psi | 79% | 3159 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,098 psi | 53% | 2818 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 45% | 1932 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,171 psi | 83% | 3199 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,648 psi | 81% | 3228 fps | 100% |
| ReloadSwiss RS 76 | 79.2 gr | 80% | 31,894 psi | 50% | 2828 fps | 95.6% |
| ReloadSwiss RS 80 | 89.8 gr | 90% | 42,235 psi | 66% | 3081 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 45,150 psi | 71% | 3022 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,511 psi | 68% | 3028 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,374 psi | 84% | 3146 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,822 psi | 81% | 3140 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,359 psi | 82% | 3094 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,163 psi | 68% | 3022 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 46,050 psi | 72% | 3009 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 49,066 psi | 77% | 3110 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,077 psi | 69% | 3002 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 52,939 psi | 83% | 3150 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,392 psi | 60% | 2864 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,315 psi | 82% | 3156 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,265 psi | 68% | 3018 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,221 psi | 66% | 3048 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 40,176 psi | 63% | 2976 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 43,540 psi | 68% | 3097 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 51,271 psi | 80% | 3301 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,373 psi | 82% | 3097 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,100 psi | 57% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,524 psi | 64% | 2923 fps | 97.2% |
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 70 powders for 7-.300 Norma Mag. loaded with the .284 | 135gr | Atomic 29 HP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,442 fps; across all powders the maximum-charge window runs from 2,106 fps to 3,442 fps. ADI AR 2218 gives the best case fill at 100 %, and 70 of the 70 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 7-.300 Norma Mag. with the .284 | 135gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.