I just recently got this caliber for my daughter and started reloading for it. I want to point out at the start that this will be for hunting. So I started out on a medium load, 45g of IMR 4350 with a 139g Hornady SST. I got a little over 2700fps on velocity. I'd like to get over 2800. She is pretty comfortable with the recoil, as it is less then the Remington Core-Lokt ammo I bought to break the barrel in with. Since I just really started reloading I'm finding some different info on loads that people are using for this caliber, using various powders. I'm pretty happy with using the Hornady bullets, either Interbond or SST, they both have the same BC. But with these various powders like IMR, Varget, RL15, RL17, etc. I'm wanting to just know in lamen terms what the difference is between these that a beginner like myself would understand. I realize that all rifles will perform differently with different powders, bullets, etc. and I need to find what will best work in my rifle. I'm just trying to get a feel for these different powders and what might be more advantages for me with respect to each one. This could actually apply to any reloading I do for my other guns as well. I guess that's the beauty of reloading yourself...there are many doors to open and explore. Thanks for any advice or information you can give me.