Ackley,were you using the 52 gr flat base or Speers 52gr Match bullet?Last year was the first year I even shot the 52Match on paper.I wasn't too impressed with my groups,but then again,I'm not a consistent bench shooter.Speers 52 Match doesn't have as large of HP,and also has a BT.I never tried them on fur.But you may be right about the lot to lot variation.I think it was in the later part of the 80's when I read an article from Rick Jamison,that said the flat base 52gr Speer's proved to be the most deadly bullet,of any he had tried yet.And as long as we're on Speer bullets,I've down my "stray cat"test on the 50gr TNT's,out of a 221Fireball,and the cat held it.No exit.As far as Sierra bullets go,I've always been a fan of their 55gr spitz,or the 55gr Blitz.Every time I get a new .22cal.,I always shot 50gr V-max,and a Sierra 50 Blitz,as well as a Hornady 55SX.If the gun won't shoot at least one of those three bullets,the gun has to find a new home.I almost forgot,the Barnes Varmintator,would normally shoot well also.Wasn't much on killin,but would print some pretty groups.