255 to 300 plus cast hard, 900 past 1000 fps; suggest a flat nose, like LBT style or Keith wide meplat for close range...complete penetration with 255 broadside and 300 grainers end to end at 1000 fps and surely above that speed ... with xtp hornady Hollow points, check the speed the manufacturer says it expands at... I would not count on expansion for my uses.. too close it fails to hold together and fragments due to too much speed... too far/too slow and it expands not at all and penetrates possibly but probably not sufficiently... it has a window of performance... the cast, if heavy is going through regardless of distance or speed up to a point..
Point is >> the lack of expansion on big non deforming bullets with a sharp shoulder and flat point is more reliable for real world big game than the high tech expander relying on performace contingent on speed and resistance relationship...
I just go for the reliable... but you can have a heap of fun/success with hollow point bullets and well placed shots at sufficient speed to penterate the vitals... but if you hit sufficient resistance at too great or too little speed the round will fail...not penetrate... to the vitals...
with rifle rounds it is different, they move at sufficiently fast pace to perform within the large window they operate ... pistols are meant to kill by penetration and blood loss.. so the larger diameter and the longer the wound channel the better...
that is just what I have learned..
I would use hard cast and count on penetration in any large bore pistol...regardles of make or round... at pistol ranges irons are fine, with practice sufficient to put it in a pie plate...I would go with a 300 grain or just less and a cast flat nose and practice and not look back... but do sharpen the skinning knife....bone and muscle will not stop it..
dk