info
Dpms lower, geissel trigger
308 24 inch upper w mickluk(sp?) break
I am currently shooting corbon 308 190g factory ammo, and it function fine.
I have been trying to find a reload for it with both 190 and 175 smk's. I have done ladder tests with the following powders, with the max book load being the top of the ladder and 1 grain drops for each level lower. lowest load tested 5 grains less than max. I have tried Varget, 4350, 4895, re15 and tac. With every powder as I reached the middle range of test loads I started punching holes in the primers, sometimes the primer circle material ended up in the bolt and jammed the gun. 4895 and tac had the fewest holes punched, and made it to the 4th "rung" in the test. All the tests were 2-300 fps under the corbon stuff. And no pressure signs on the cases, or primers that werent punched.
It was told to check the firing pin and firing pin hole diameter, and I took it to a gunsmith to measure it. He stated it was "ok". And called at a later time to ask if I measured the how far the firing pin extruded from the bolt, I need to take it back to let him use a better too than me using the wrong end of my calipers and doing math.... But from what I can measure its .050. I can find where ar15's are suppose to be .020 to .036, but ar10's may be different. I did notice my geissel is pounding my firing pin and mushrooming it out where the hammer hits it, not bad just barely an edge to it.
I need to reload for it, or I will have to sell it as I wont put out the cash for factory ammo.
The gun has 140 rounds of corbon 190's, 140 rounds of prvi 168 match and the ladder tests mentioned above down the tube.
Any help would be great, if there is another thread that addresses this please post it or pm me. I may not have used the correct words in my searches. I can also provide more info if it would help in you aiding me.
Thanks in advance
Greg
Dpms lower, geissel trigger
308 24 inch upper w mickluk(sp?) break
I am currently shooting corbon 308 190g factory ammo, and it function fine.
I have been trying to find a reload for it with both 190 and 175 smk's. I have done ladder tests with the following powders, with the max book load being the top of the ladder and 1 grain drops for each level lower. lowest load tested 5 grains less than max. I have tried Varget, 4350, 4895, re15 and tac. With every powder as I reached the middle range of test loads I started punching holes in the primers, sometimes the primer circle material ended up in the bolt and jammed the gun. 4895 and tac had the fewest holes punched, and made it to the 4th "rung" in the test. All the tests were 2-300 fps under the corbon stuff. And no pressure signs on the cases, or primers that werent punched.
It was told to check the firing pin and firing pin hole diameter, and I took it to a gunsmith to measure it. He stated it was "ok". And called at a later time to ask if I measured the how far the firing pin extruded from the bolt, I need to take it back to let him use a better too than me using the wrong end of my calipers and doing math.... But from what I can measure its .050. I can find where ar15's are suppose to be .020 to .036, but ar10's may be different. I did notice my geissel is pounding my firing pin and mushrooming it out where the hammer hits it, not bad just barely an edge to it.
I need to reload for it, or I will have to sell it as I wont put out the cash for factory ammo.
The gun has 140 rounds of corbon 190's, 140 rounds of prvi 168 match and the ladder tests mentioned above down the tube.
Any help would be great, if there is another thread that addresses this please post it or pm me. I may not have used the correct words in my searches. I can also provide more info if it would help in you aiding me.
Thanks in advance
Greg
