rhd2542 Posted December 21, 2013 Share Posted December 21, 2013 I'm shooting 180 gr hp montana gold with 4.9 gr of n 320. Oal 1.180 " The bullet holes are round but there is a tear on one side of the bullet hole. It's almost as if the bullet is not entering the target straight. It seems to accurate but the hole are not perfectly round. I shoot my buddies rounds and they did make a round hole, same bullet and powder. I have changed the seating die but still does the same. This round is being shot thru a sv sight tracker. I need some advise!!! Link to comment Share on other sites More sharing options...
yoshidaex Posted December 21, 2013 Share Posted December 21, 2013 How's the crimp? Link to comment Share on other sites More sharing options...
joshxdm9 Posted December 21, 2013 Share Posted December 21, 2013 Check for to much crimp. When I loaded 124gr jhp 9mm Montana golds I crimped very little and never had a issue with tumbling. Link to comment Share on other sites More sharing options...
rhd2542 Posted December 21, 2013 Author Share Posted December 21, 2013 Crimp is .420" also the barrel is an AET Link to comment Share on other sites More sharing options...
rhd2542 Posted December 21, 2013 Author Share Posted December 21, 2013 I would call this bullet tumbling . It's has a black circle with a tear on one side of the hole. Link to comment Share on other sites More sharing options...
joshxdm9 Posted December 21, 2013 Share Posted December 21, 2013 I would call this bullet tumbling . It's has a black circle with a tear on one side of the hole. Link to comment Share on other sites More sharing options...
joshxdm9 Posted December 21, 2013 Share Posted December 21, 2013 I would back off your crimp die just a little at a time to see if it stops the tumbling Link to comment Share on other sites More sharing options...
Sarge Posted December 21, 2013 Share Posted December 21, 2013 I need some advise!!! Link to comment Share on other sites More sharing options...
Youngeyes Posted December 21, 2013 Share Posted December 21, 2013 Pull one of your bullets. I'll bet you find some indent marks. You should only crimp just enough to take out the belling. You said you changed the seating die. Why? Do you run a separate crimp die? Does your friend use the same OAL? Does he have a separate crimp die? Is this your first attempt at loading for your gun? Link to comment Share on other sites More sharing options...
rhd2542 Posted December 21, 2013 Author Share Posted December 21, 2013 This is the first time loading for this gun. I had a redding seating die which I changed back to Dillon Dies which has a separate crimping die. My buddies round was the same oal, his crimp was .418" which I did try today on my load. I bought this gun used with a very low round count. (500) The gun has a Shuemann AET barrel which has never been cleaned, and shot only MG bullets. Link to comment Share on other sites More sharing options...
Sarge Posted December 21, 2013 Share Posted December 21, 2013 What percentage of the holes are not perfect? Link to comment Share on other sites More sharing options...
rhd2542 Posted December 21, 2013 Author Share Posted December 21, 2013 Maybe 25-30% Link to comment Share on other sites More sharing options...
kneelingatlas Posted December 21, 2013 Share Posted December 21, 2013 I need some advise!!! Advice is a noun, advise is a verb... Link to comment Share on other sites More sharing options...
Justsomeguy Posted December 21, 2013 Share Posted December 21, 2013 (edited) Normally with a "tumbling" issue you could look at several factors, one of which is overcrimping which damages the bullet, which is easily solved. However, some manufacturers have recently changed some of the twist rates in their barrels which might adversely affect bullets that are heavier for the caliber. Though most 40's will shoot 180grn bullets with excellent accuracy, and not all your bullets are showing this slight "yawing" on the target, it does sound like it could maybe be a stabilization issue which could be related to the barrel's twist rate. If you can find out from the barrel manufacturer just what they intended for bullet weight you might have more information as to how to proceed. That said, check your reloading techniques as well. It could just be you. Edited December 21, 2013 by Justsomeguy Link to comment Share on other sites More sharing options...
Sarge Posted December 21, 2013 Share Posted December 21, 2013 If you have a chrono and you know the loads are in the green I would bump the load a tad and see what effect it has. Sometimes a little more or a little less speed can fix these issues. Link to comment Share on other sites More sharing options...
jcc7x7 Posted December 22, 2013 Share Posted December 22, 2013 Also try your loads much closer and much farther away i.e 25 and 50 yards. If the yaw gets much worse or sometime it will even clear up you know for sure its tumbling/yaw problem and not just that your bullet tears the paper different than you buddies bullets. Also shot some of your loads out of your friends gun to see if they do the same thing etc this is some simple ADVICE that may help jcc7x7 Sarge ain't the English language great! Link to comment Share on other sites More sharing options...
Gandof Posted December 25, 2013 Share Posted December 25, 2013 Also make sure your target is tight against the cardboard backing. If it's a little slack you'll often get tears around the bullet hole. Link to comment Share on other sites More sharing options...
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