I have been working up loads for a 44 mag Handi Rifle with some Keith style 240 grain plain base with 2400 and IMR 4227. I have some 270 gr of the same profile and some of the Lee 310 gr that I want to try. I have been looking around and haven't as of yet found any load data for those Lee boolits. Lyman 50th has loads for a 300gr in a pistol but not for rifle. Ammo Guide has a couple of loads but once again those are for pistols.
Am I over thinking this and should just reduce by 10% and use the pistol load data? Suggestions?