Home Forums Reloading Big Game Rifles Favourite powder for 280 with 22" barrel

IMR-4831 works best for me as far as accuracy, velocity, and consistency! IMR has the velocity but shows signs of pressure in my Cooper M52

Meant to say IMR-7828 shows signs of pressure!!! I predominantly shoot 150 to 160 gr. bullets in my 280. Leave the 140's for my 7mm-08. With 160 grainer im able to achieve 2950 fps with imr-4831 and almost 3000 fps with 7828 (28" barrel of course)

Everything shows signs of pressure if you put enough in.

Unusually, high velocities are coupled to high(er) pressures.

Law of physics, until the law of diminishing returns sets in.

MM

56 gr. of RL19 under 140's shoots tiny little one hole groups out of my rifle.

I don't have a 280 but RL22 and 160gr Partitions are a sweet combination in my 7x64 so there's a real good chance the same pairing would be handy in a 280.

My 280 likes R-22 with CCI-200s.

I like three powders, all of which aren't temperature sensitive. H4350, H4831 SC, and Ramshot Hunter. I'm on my 2nd .280. E