I have an 8 lb keg of IMR 7828 which gives excellent accuracy and velocity in my 7mm RUM and 338 RUM. I just started working on a load for the 300 RUM 200 gr Accubond. I used some Retumbo yesterday and was crunching powder due to the deep seat of the bullet to function in the magazine box. I still wasn't at the velocity I'm hoping for and didn't have pressure signs.
7828 is faster by several spots on the burn rate chart than Retumbo and should be a lighter powder charge for the same velocity. I'm hoping for 3150 to just maybe 3200 fps out of my 26" barrel (I was at 3115 with the Retumbo no pressure signs). 7828 would give a nice load density with the deep seated bullet.
Might I see any sharp pressure spikes as I increased the powder charge before I get to my goal of 3150 fps? I also have some H1000 but would like to use the 7828 if I can.
Thanks!
Sam
7828 is faster by several spots on the burn rate chart than Retumbo and should be a lighter powder charge for the same velocity. I'm hoping for 3150 to just maybe 3200 fps out of my 26" barrel (I was at 3115 with the Retumbo no pressure signs). 7828 would give a nice load density with the deep seated bullet.
Might I see any sharp pressure spikes as I increased the powder charge before I get to my goal of 3150 fps? I also have some H1000 but would like to use the 7828 if I can.
Thanks!
Sam