Magpro

jwp475

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Magpro is an excellent slow burn spherical powder that produces outstanding velocity in such cartridges as the 270 Winchester and the 280 Remington and 300 Win mag. These are the 3 cartridges that I have tried with Magpro so for.
24" barrel 300 win, 180 gr. TTSX 85.7 gr. 3154 FPS, the same load in a 29" barrel produced 3213 FPS.
In the 280 Remington 65.7 grains produced 3132 FPS

For the 280 I used 270 Winchester 130 load data for the TTSX since the two have nearly the same SD. I wanted to load the 280 to the same pressure as the 270 Winchester
 
The load for the 300 Win mag should be 84 gr. Magpro not 85.7
 
What bullet weight for the .280?
 
Pretty heavily compressed charge. When I had a .280 years ago, using the old powders, I got that same speed with IIRC about 59 grs of IMR4350.
Was able to drive a 160 to over 2900fps as well.
.280 is a great round.
 
I tried Ramshot Magnum for a few loads in my 280AI. Velocities were a little disappointing for both 160 and 175 gr pills.

IMR 4831 got me just under 3k fps with 160 gr A Frame, tho
 
Last edited:
I tried Ramshot Magnum for a few loads in my 280AI. Velocities were a little disappointing for both 160 and 175 gr pills.

IMR 4831 got me just under 3k fps with 160 gr A Frame, tho

I've noticed that at times the loads have exceed the recommended load to equal the predicted velocity because of different chamber and barrel dimensions even with the same length
 

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