TalkingMonkey Posted November 30, 2016 Share Posted November 30, 2016 I started reloading about a year ago and have loaded and shot around 7,000 rounds since then. So far, I’ve had no issues with function or accuracy with any of my Gen 3 Glocks (G19, G34). Recently, however, I’ve noticed some strange behavior when shot through a Gen 4 G34. At 50ft, the Gen 4 is grouping 2-inches high and 2-inches left. The same gun shoots POI/POA with Federal HST 124gr, Speer Gold Dot 124gr, and my friend’s light 147gr reloads. Any thoughts as to why I'm seeing a POI shift from my reloads only with the Gen 4 G34? This is the load I’m using: X-treme copper plated, 9mm, 124gr RN 4gr Titegroup 1.150" OAL Crimp is about .379" - .378" DIA CCI Small Pistol Primers Primarily Federal and Blazer brass Loaded on a Dillon 650 Velocity is around 1131fps I've verified this behavior a few times and have even had a couple other people shoot the gun and experience the same POI shift. Link to comment Share on other sites More sharing options...
jcc7x7 Posted November 30, 2016 Share Posted November 30, 2016 Just one of those things Might try another bullet, get some sample packs and hopefully one hits same poi Link to comment Share on other sites More sharing options...
Brucenterry Posted November 30, 2016 Share Posted November 30, 2016 You may try swapping barrels to see if it follows the gun. Only other difference is the recoil spring. I have a gen4 that does this. Had several people shoot it and tried several brands of ammo but still the same results (high left). Swapped barrels and it improved so I bought a KKM barrel but still not as good as my gen3's. Link to comment Share on other sites More sharing options...
MemphisMechanic Posted December 1, 2016 Share Posted December 1, 2016 Change your OAL or try +\- 0.2 grains in charge weight, or change powders or bullets entirely, and see what happens. Some bullets or bullet & powder combinations don't like certain guns. Just the way it is. Link to comment Share on other sites More sharing options...
Sarge Posted December 1, 2016 Share Posted December 1, 2016 16 minutes ago, MemphisMechanic said: Change your OAL or try +\- 0.2 grains in charge weight, or change powders or bullets entirely, and see what happens. Some bullets or bullet & powder combinations don't like certain guns. Just the way it is. Absolutely! I learned by accident that Groups varied from dead on, to high right, low left etc by changing oal, charge weight, bullet brand etc Link to comment Share on other sites More sharing options...
dillon Posted December 1, 2016 Share Posted December 1, 2016 Different primers can cause a shift in location of a group. Buy a few boxes of different brands of primers, load 10 rounds, and shoot them on different targets. See which one groups closer to point of aim. Link to comment Share on other sites More sharing options...
a matt Posted December 2, 2016 Share Posted December 2, 2016 3n38 shoots like a champ but AutoComp & HS-6 are all over the place. Then the HS-6 & AutoComp shoot great outta guns 2 & 3 but 3n38 is a joke. You can't hit cardboard at 25 yards. Gun 4 3n38 only. Another "one of those things". Cheers.... i believe I'm gong to try some Acurate #7. But only because VV is stupid expensive but it is great powder after you see the finance officer to get enough for a year, lmao. Link to comment Share on other sites More sharing options...
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