I have found some lot to lot variation with RL 15 in my Whelens. Also throat length varies a lot between rifles. ruger and Remington have 1-16" twist and long throats, my 2 custom barrel rifles have shorter throats and 1-12" and 1-14" twist. I load all of them to 2500 fps with 250 grain bullets and RL 15, but charge weight varies with the rifle and lot of powder.

Last edited by castnblast; 07/03/17. Reason: fixed typo