Magpro

[jwp475]

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

 

[jwp475]

The load for the 300 Win mag should be 84 gr. Magpro not 85.7

 

[sestoppelman]

What bullet weight for the .280?

 

[jwp475]

What bullet weight for the .280?

140 gr. TTSX

 

[sestoppelman]

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.

 

[jwp475]

280 Remington, 24" barrel and 65.7 grains of Magpro

 

[sgt_zim]

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

 

[jwp475]

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