"bullets are easy enough to find though, since both Woodleigh and Swift make them. I bought 3 boxes of bullets, one box 400gr Woodleigh SP, one box of 400gr Swift SP, and one box of Swift 350gr SP. the gun is regulated for Hornady factory ammo but I would have to be 100% positive absolutely nothing else will work before I use a Hornady DGX bullet for dangerous game." ______________________________ A rifle regulated with Hornady bullets will usually need Hornady bullets, OR BULLETS WITH SAME OVERALL CONTOUR AS HORNADY BULLETS, to shoot same as was done during final regulation. Using bullets with different contour, will usually not shoot as well as ones originally regulated with. Matt--"if I can get the swift 350gr bullet pushed to a slightly faster speed and get close to the POA with the sight in either barrel then I may take the rifle deer hunting with me this year." _________________ Some rifles may shoot well with slightly lighter or heavier bullets than originally regulated with (for example, the .375 flanged will often shoot well with either the 270 grain or the 300 grain bullets), but usually they will not, so it is best to shoot the 400 grain bullets in this .400 Jeffery. Matt " I wont need the bullet to regulate in both barrels, just be close in one barrel." Ok, but that is not using rifle the way it was intended, as made. I figure it would get me used to carrying the gun around and the ranges I hunt at are inside 100yrds so the irons will work fine. plus it will make for interesting conversation around the camp fire. "