Load Specifications
Load data in caliber .256 Mag. Gibbs with .257 | 72gr | Reichenberg Spezial Jagd bullet and 38 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Accurate 4064 and Lovex D073.6.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 42,772 psi | 87% | 3238 fps | 99.8% |
| Accurate 2460 | <<locked>> | 82% | 43,700 psi | 89% | 3278 fps | 98.2% |
| Accurate 2495 | <<locked>> | 90% | 42,148 psi | 85% | 3274 fps | 99.8% |
| Accurate 2520 | <<locked>> | 84% | 41,669 psi | 85% | 3268 fps | 97.4% |
| Accurate 4064 | <<locked>> | 92% | 42,366 psi | 86% | 3304 fps | 98.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 44,411 psi | 90% | 3301 fps | 96.3% |
| Alliant AR-Comp | <<locked>> | 86% | 42,540 psi | 86% | 3320 fps | 100% |
| Bofors RP3 | <<locked>> | 94% | 44,425 psi | 90% | 3350 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 43,830 psi | 89% | 3245 fps | 96.8% |
| Hodgdon BL-C2 | <<locked>> | 86% | 42,366 psi | 86% | 3301 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 82% | 44,280 psi | 90% | 3327 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,808 psi | 69% | 2221 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 43,468 psi | 88% | 3366 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 44,411 psi | 90% | 3301 fps | 96.3% |
| Lovex D073.5 | <<locked>> | 82% | 43,598 psi | 88% | 3274 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 88% | 42,989 psi | 87% | 3307 fps | 97.7% |
| Lovex S062 | <<locked>> | 92% | 44,411 psi | 90% | 3310 fps | 96.4% |
| Norma 201 | <<locked>> | 88% | 43,714 psi | 89% | 3281 fps | 96.2% |
| Norma 202 | <<locked>> | 88% | 43,671 psi | 89% | 3304 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,924 psi | 69% | 2270 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 43,801 psi | 89% | 3291 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 42,235 psi | 86% | 3376 fps | 97% |
| Rottweil R 901 | <<locked>> | 84% | 42,192 psi | 86% | 3241 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 90% | 43,990 psi | 89% | 3278 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 42,989 psi | 87% | 3307 fps | 97.7% |
| Shooters World Precision | <<locked>> | 92% | 44,411 psi | 90% | 3310 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 42,931 psi | 87% | 3199 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 42,409 psi | 86% | 3192 fps | 99% |
| Somchem S321 | <<locked>> | 82% | 41,800 psi | 85% | 3255 fps | 95.9% |
| Somchem S335 | <<locked>> | 86% | 42,424 psi | 86% | 3202 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 82% | 42,946 psi | 87% | 3202 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 42,801 psi | 87% | 3209 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 90% | 42,453 psi | 86% | 3278 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 90% | 44,208 psi | 90% | 3284 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 96% | 43,410 psi | 88% | 3268 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 86% | 44,411 psi | 90% | 3291 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 90% | 42,801 psi | 87% | 3264 fps | 98.2% |
| Winchester 748 | <<locked>> | 86% | 43,192 psi | 88% | 3333 fps | 97% |
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% | 37,376 psi | 76% | 3110 fps | 99% |
| Accurate 2460 | <<locked>> | 80% | 40,785 psi | 83% | 3212 fps | 97.6% |
| Accurate 2495 | <<locked>> | 80% | 30,081 psi | 61% | 2959 fps | 97.4% |
| Accurate 2520 | <<locked>> | 80% | 36,172 psi | 73% | 3130 fps | 95.7% |
| Accurate 4064 | 39.2 gr | 84% | 32,372 psi | 66% | 3041 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 41,466 psi | 84% | 3228 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 34,809 psi | 71% | 3140 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 41,365 psi | 84% | 3281 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,609 psi | 78% | 3114 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 84% | 39,523 psi | 80% | 3232 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 41,481 psi | 84% | 3264 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,034 psi | 51% | 1991 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 33,054 psi | 67% | 3100 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 84% | 41,466 psi | 84% | 3228 fps | 95.4% |
| Lovex D073.5 | <<locked>> | 80% | 40,669 psi | 82% | 3205 fps | 96.3% |
| Lovex D073.6 | 40.3 gr | 82% | 34,737 psi | 70% | 3100 fps | 95.1% |
| Lovex S062 | <<locked>> | 90% | 41,771 psi | 85% | 3248 fps | 95.7% |
| Norma 201 | <<locked>> | 86% | 41,104 psi | 83% | 3222 fps | 95.4% |
| Norma 202 | <<locked>> | 80% | 33,736 psi | 68% | 3051 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,990 psi | 51% | 2034 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,886 psi | 83% | 3222 fps | 96.8% |
| ReloadSwiss RS 60 | 46.1 gr | 92% | 39,450 psi | 80% | 3301 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 37,362 psi | 76% | 3117 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 88% | 41,350 psi | 84% | 3219 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 34,737 psi | 70% | 3100 fps | 95.1% |
| Shooters World Precision | <<locked>> | 90% | 41,771 psi | 85% | 3248 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,476 psi | 72% | 3015 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 30,763 psi | 62% | 2894 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 39,030 psi | 79% | 3186 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 35,128 psi | 71% | 3022 fps | 97% |
| Vihtavuori N130 | <<locked>> | 80% | 40,335 psi | 82% | 3146 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 80% | 35,433 psi | 72% | 3031 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 80% | 30,516 psi | 62% | 2972 fps | 97.4% |
| Vihtavuori N140 | <<locked>> | 80% | 31,821 psi | 65% | 2969 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 92% | 38,203 psi | 77% | 3146 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 84% | 41,394 psi | 84% | 3222 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 82% | 32,808 psi | 67% | 3005 fps | 95% |
| Winchester 748 | <<locked>> | 82% | 37,565 psi | 76% | 3192 fps | 95.2% |
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 38 powders for .256 Mag. Gibbs loaded with the .257 | 72gr | Reichenberg Spezial Jagd. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,376 fps; across all powders the maximum-charge window runs from 2,221 fps to 3,376 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14 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, Accurate 4064, Lovex D073.6 rank at the top here: for .256 Mag. Gibbs with the .257 | 72gr | Reichenberg Spezial Jagd 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.