Jachin Posted February 28, 2013 Share Posted February 28, 2013 Has anyone experienced heavier bullets grouping or hitting higher than lighter bullets. I shoot an XDm 9mm with 4.5 barrel. The following three loads were used in the discovery. 1) 115 grain factor Blazer Brass and Winchester white box hit red dot dead center to a 1/4 inch high at ten yards. Advertised 1145 fps. 2) 124 grain Bayou Bullets over 4.4gr. of W-231, oal 1.145, .377-.378 crimp, chrono’d 1080fps are hitting about 1-1/4 inches high of dead center. 3) 135 grain Bayou Bullet over 3.9gr. of W-231, oal 1.145, .377-.378 crimp, chrono’d 998 fps are hitting about 2 inches high of dead center. Shots are from bench rest at ten yards. I first discovered this about two months ago when myself and a friend were shooting at 100 yards, mostly for fun and the 135's were flying over a full size silhouette target while aiming at center mass. In the past I have shot the 115's several different times and consistently had 18 inch groups centered around my point of aim. I had to aim at the bottom of the target, about 24 inches below point of impact. Groups were about 24 inches. There seems to be a consistency here, anyone had any similar experience? Over, Link to comment Share on other sites More sharing options...
MstngLX50 Posted February 28, 2013 Share Posted February 28, 2013 Yes. I've experienced slower, which generally means heavier, bullets hitting higher. I've been told it's because the bullet is in the barrel longer, recoil starts to lift the pistol in the hand, and barrel is beginning the unlocking process. Seems logical to me, and it fits with my experience. Link to comment Share on other sites More sharing options...
PROBIKE101 Posted February 28, 2013 Share Posted February 28, 2013 YEP,farther you are away aim a little lower,i use 147 grain and they do it to....... Link to comment Share on other sites More sharing options...
Amerflyer48 Posted February 28, 2013 Share Posted February 28, 2013 Yep, that is how I regulated a set of sights on a sixgun I own ran out of adjustments using a 220 gr. shoots the 155LSWC /180JHPs just fine and beats filing down sights Herters .401 PowerMags John as far as barrel time and recoil they are spot on lighter/faster bullet needs less counter adjustment to sights or follow through Link to comment Share on other sites More sharing options...
Jachin Posted February 28, 2013 Author Share Posted February 28, 2013 Well that's good news! I hated to think I was looking into a deep mystery. Thanks, Link to comment Share on other sites More sharing options...
practical_man Posted March 1, 2013 Share Posted March 1, 2013 Yes. Heavier bullets in my handguns tend to group higher than lighter ones, all else being equal Link to comment Share on other sites More sharing options...
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