I am having difficulties finding a load with the bullet, powder, and barrel length. I am using 280gr. pfn Berry bullets- IMR 4227- and a 16inch barrel Puma Trapper M-92. I have found a load with Hogden 4227, but not with IMR also this load is listed for jhp. IMR4227, and Hogden 4227 are beside each other on the burn scales. Can I substitute IMR for Hogden and if so what powder charge to start. I got the 280grn. by mistake thought I was getting 240's I can still use them in my S&W 629 but would like to use the same loads in both. Thanks ISME