Packy...I have an early model XP-100 7 BR I rechambered to 284 W. Shot OK when you could keep it ahold of it...NO MB. Used to hand it to anyone that thought their 44 Mags and 454's were hairy. One shot and they were usually through with it...loose hold and it would thump you on your head...Re-barreled it to 7-08 with a heavier, longer Shilen barrel WITH a MB...Stays down now and still shoots great...120 gr VM's deadly out to 300 plus on sage rats and 140's/150's for anything larger. 284 W really didn't add too much more velo just a lot more muzzle blast, noise and recoil...Rifle OK, Pistol questionable.