Dragon11 Posted July 25, 2014 Share Posted July 25, 2014 I'm hoping someone can explain this to me. I currently shoot a Glock 34 with Trijicon sights in production division. My load is 147g Bayou bullets with 3.5 grains of PB powder. At 25 yards by bullets are grouping 6 inches high consistently, point of aim point of impact. When I go out to 50 yards, they hit about 8 inches high. If I shoot the same gun with factory ammo, Federal 115g, the bullets hit dead on point of aim point of impact, at 25 yards. Can the bullet weight change the point of impact from point of aim that much? I have also loaded with Super Target powder and had the same results. Link to comment Share on other sites More sharing options...
Steve RA Posted July 25, 2014 Share Posted July 25, 2014 The heavier bullet has lower velocity, stays in the barrel a little longer and exits at a higher point in the recoil. Link to comment Share on other sites More sharing options...
SPDGG Posted July 25, 2014 Share Posted July 25, 2014 (edited) fwiw: If you stick with that load and prefer a lower POI, need to swap to a "taller" front sight height. * * * Dawson Precision site for Front Sight Height Calculation: http://www.dawsonprecision.com/CategoryProductList.jsp?cat=SIGHTS+FRONT Dawson Precision offers various Glock Front Sight Heights & Types: http://www.dawsonprecision.com/CategoryProductList.jsp?cat=SIGHTS+FRONT%3AGlock+Front+Sights:Glock+Standard+Front+Sights -or- swap to a different sight setup: Warren Tactical http://www.shootersconnectionstore.com/Glock-Sights-C455.aspx?m=68 Taran Tactical http://www.shootersconnectionstore.com/Taran-Tactical-Ultimate-Fiber-Optic-Sights-Set-for-GLOCK-P2840.aspx Dawson Precision http://www.shootersconnectionstore.com/Glock-Sights-C455.aspx ^ Choose Front Sight Height from description above Edited July 25, 2014 by SPDGG Link to comment Share on other sites More sharing options...
Dragon11 Posted July 25, 2014 Author Share Posted July 25, 2014 I'm getting some 124g Bayous sent out to me to try. I'm glad I asked, my twisted logic had me thinking I needed to order a heavier bullet. If I can stay with the same style of sights and adjust my load a little bit, I'll be happy with that. Link to comment Share on other sites More sharing options...
njl Posted July 25, 2014 Share Posted July 25, 2014 The heavier bullet has lower velocity, stays in the barrel a little longer and exits at a higher point in the recoil. I guess that makes sense...because other than that, a heavier/slower bullet should drop faster, so they should be hitting low, not high...and not even higher at greater distances. Perhaps a firmer grip (trying to resist muzzle flip) is in order? Link to comment Share on other sites More sharing options...
TCWriter Posted July 26, 2014 Share Posted July 26, 2014 I've seen the same effect (slower rounds impacting higher) on my G34 and G19, and assumed the "time in barrel" explanation was the reason. Fortunately, my G34 sights (Sevigney with the tall front FO) are right on with the 147 match loads. My G19 carry gun (Warren night sights) shoots a little high with 147 grain defense loads, so I'm ordering some 124 grain defense rounds to see if they are closer to point of aim. Good luck. Link to comment Share on other sites More sharing options...
jcc7x7 Posted July 26, 2014 Share Posted July 26, 2014 In my 40 2011 and Para 200 gr bullets hit 3 's higher than 180's both loaded to 172-173 PF Same Same Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted July 26, 2014 Share Posted July 26, 2014 I've had same results. In addition, I've seen heavier or lighter bullets hit left or right ... Don't recall if the heavier or lighter bullets hit to the left, but I believe it's the heavier bullets tend to hit left in my BHP. (Guess it would depend on whether the rifling is clockwise or counterclockwise). Link to comment Share on other sites More sharing options...
b1gcountry Posted July 26, 2014 Share Posted July 26, 2014 I wonder if a heavier recoil spring assembly would help solve this... Link to comment Share on other sites More sharing options...
Steve RA Posted July 26, 2014 Share Posted July 26, 2014 Adjustable sights are the best answer - determine the load you want to use - adjust sights - Presto, home free !!! Link to comment Share on other sites More sharing options...
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