Back in October, I did a post on Alliant's new 300MP powder in a carbine. Those values were for the low end of the recommended load range. Last month I was able to get to a range where I could set up a chronograph so I tested loads at the high end of the range.
- Gun = Marlin 1894C 18.5" barrel
- Bullet = Hornady 158 gr XTP/FP
- Case = Starline 357 magnum
- Primer = Winchester Small Pistol
- Powder = Alliant 300 MP
- Ambient temperature = 88F (prox)
| Charge Weight | Average | Standard Deviation | Minimum | Maximum | Spread |
|---|---|---|---|---|---|
| 18.0 | 1,839 | 4 | 1,846 | 1,836 | 10 |
| 18.2 | 1,853 | 7 | 1,844 | 1,859 | 15 |
| 18.4 | 1,854 | 10 | 1,870 | 1,841 | 29 |
At 18.2 gr -- still 0.4 gr below the maximum recommend charge for 158 gr jacketed bullets -- the XTP slugs were clocking as fast or faster than any commercial ammunition I've tested so far except for the Buffalo Bore 19C. Since Tim Sundles must be in league with the devil I don't really feel too bad about that.
I think I have found my new go to powder for 357 magnum in the 1894C.
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