I use the 265 Hornady interlocs they are made for the 444 marlin, the XTP is suppose to work goo too. I'll be trying them soon. Pistol bullets are made for lower vel. of the pistols ie 1200fps and under. They have thin jackets and tend to blow up if you shoot through and into brushy areas or over expand at the higher vel. of the rifle. Any reloading manual will tell you the effective vel of each of their bullets. I'm a Hornady fan my self I use the 265 with 21.0g H110 and large pistol primers, shoots good and should be at about 16-1700fps. REMEMBER the .44 is a good 100 yard rifle, 150 if you can shoot real good. Where I hunt its less than 100, if over I use my 30-06. I've done alot of researh to find out this info and I have a real deeep fondness for this round.