Originally Posted by
lonewolf5348
I use to shoot the dead centers from precision in my t/c thunderhawk using 85 grains of 777 gun will groupe outstanding.
I think the over the 100 grains may be your problem.
+1.
I have a lot of experience with Dead Centers. While they are accurate and perform well on game, their soft lead construction will not handle velocities over about 1800-2000 fps well. Precision Rifle will not tell you that but I have shot them in enough guns and have enough shooting buddies who have done the same to see that we have NEVER found an accurate load over 2000 fps and 1800 fps is a more realistic limit in most guns; the bullets apparently start to deform over that.
You're just pushing them too hard. Back off on the powder to 85gr and work your way up in 5gr increments.
The other possibility is your gun just doesn't like them. The reason I stopped using Dead Center bullets was that I switched to my Omega and it would not shoot any weight of them accurately at any reasonable (85gr+) charge.