Load Specifications
Load data in caliber .450 Marlin with .458 | 300gr | Nosler Ballistic Silver Tip bullet and 18 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, Lovex S053 and IMR 4227.
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 5744 | <<locked>> | 82% | 42,424 psi | 89% | 2208 fps | 96.1% |
| Accurate No. 11 FS | <<locked>> | 86% | 42,859 psi | 90% | 2208 fps | 99% |
| ADI AR 2205 | <<locked>> | 88% | 42,772 psi | 89% | 2136 fps | 99.8% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 36,303 psi | 76% | 2211 fps | 97.9% |
| Hodgdon LilGun | <<locked>> | 82% | 42,670 psi | 89% | 2254 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,108 psi | 57% | 1339 fps | 100% |
| IMR 4227 | <<locked>> | 96% | 43,062 psi | 90% | 2215 fps | 97.9% |
| Lovex D060 | <<locked>> | 88% | 42,931 psi | 90% | 2218 fps | 96.2% |
| Lovex D063 | <<locked>> | 88% | 42,177 psi | 88% | 2188 fps | 96.7% |
| Lovex S053 | <<locked>> | 98% | 43,004 psi | 90% | 2224 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,542 psi | 55% | 1375 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 96% | 40,828 psi | 85% | 2228 fps | 97.3% |
| Shooters World Blackout | <<locked>> | 84% | 41,626 psi | 87% | 2192 fps | 96% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 42,931 psi | 90% | 2218 fps | 96.2% |
| Shooters World SOCOM | <<locked>> | 88% | 42,177 psi | 88% | 2188 fps | 96.7% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 42,003 psi | 88% | 2106 fps | 100% |
| Vihtavuori N110 | <<locked>> | 90% | 40,770 psi | 85% | 2146 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 36,898 psi | 77% | 2188 fps | 98.9% |
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 5744 | <<locked>> | 80% | 40,118 psi | 84% | 2169 fps | 95.5% |
| Accurate No. 11 FS | <<locked>> | 80% | 35,476 psi | 74% | 2090 fps | 97.7% |
| ADI AR 2205 | <<locked>> | 80% | 33,765 psi | 71% | 1988 fps | 98.7% |
| ADI AR 2207 | <<locked>> | 92% | 28,689 psi | 60% | 2054 fps | 95.3% |
| Hodgdon LilGun | <<locked>> | 80% | 40,001 psi | 84% | 2218 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 19,827 psi | 41% | 1198 fps | 100% |
| IMR 4227 | 40 gr | 88% | 33,968 psi | 71% | 2060 fps | 95.6% |
| Lovex D060 | <<locked>> | 86% | 40,350 psi | 84% | 2172 fps | 95.5% |
| Lovex D063 | <<locked>> | 84% | 37,289 psi | 78% | 2106 fps | 95.4% |
| Lovex S053 | 35.6 gr | 80% | 25,701 psi | 54% | 1900 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 19,377 psi | 40% | 1227 fps | 100% |
| ReloadSwiss RS 36 | 43.5 gr | 90% | 34,055 psi | 71% | 2110 fps | 95.5% |
| Shooters World Blackout | <<locked>> | 82% | 38,856 psi | 81% | 2146 fps | 95.2% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 40,350 psi | 84% | 2172 fps | 95.5% |
| Shooters World SOCOM | <<locked>> | 84% | 37,289 psi | 78% | 2106 fps | 95.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 24,729 psi | 52% | 1811 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 30,647 psi | 64% | 1978 fps | 100% |
| Vihtavuori N120 | <<locked>> | 88% | 26,179 psi | 55% | 1962 fps | 95.5% |
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 18 powders for .450 Marlin loaded with the .458 | 300gr | Nosler Ballistic Silver Tip. Hodgdon LilGun delivers the highest muzzle velocity at 2,254 fps; across all powders the maximum-charge window runs from 1,339 fps to 2,254 fps. ADI AR 2207 gives the best case fill at 100 %, and 18 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. ADI AR 2207, 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 36, Lovex S053, IMR 4227 rank at the top here: for .450 Marlin with the .458 | 300gr | Nosler Ballistic Silver Tip 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.