I had bowed out of this thread bc the answer is pretty dang clear to me. I agree that the powder makes a huge difference. My carbon rings show up with IMR 4451 quicker than they do with IMR 4350 and a H4350 takes the longest to show up. Not sure what flavor they're using in the hornady factory PRC stuff, but 90 rounds and a carbon ring like that is no surprise to me
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6.5 PRC issues
- Thread starter bebb25
- Start date
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nralifer
Well-Known Member
I agree with you. It's funny they didn't notice this problem in their testing. It sure showed up quick for bebb25. Good that you point out the H4350 is the cleanest burning. I'll have to keep that in mind.
The only cartridges I load for run in the 4350 burn range. So I have a small sampling of powers
Sometimes it pays to sit back before you leap
. This was one of those times!!! Never too old to step in 
!
Yeah … I missed what you stepped in and followed right on in..Sometimes it pays to sit back before you leap
. Already came to the group hat in hand… i will definitely read all the posts first next time….lolYes it shoots very well and I'll try to get a picture of the bolt face this evening
What are those marks on the bullet? From chambering or pulling it?
Chambering one time
nralifer
Well-Known Member
Excellent. With the rifle shooting well initially and the bullet not getting scratched up with easy chambering and un-chambering, indicate that the clearances in the clean chamber between the case neck, bullet and the chamber neck portion and throat were sufficient but close. That is why the gun shot well initially, and if cleaned well of carbon will shoot well again. This clearly indicates that carbon buildup in those tight spaces eventually will cause problems of the type you have seen. The rifle likely shoots well because of those tight clearances, keeping the loaded round aligned better with the rifling. Again the solution is a cleaner burning powder, if not that, then more frequent removal of carbon build up, or rechambering with a chamber reamer that is slightly wider in those areas to accommodate more carbon build up before it starts to affect the chambering of the loaded round. One suggestion made was to use calipers to measure the neck diameter in an unfired round and a fired unsized case to see the difference between the two measurements. This gives an idea of the clearance at the neck area.
Some of those cases look like they have been fired twice? You are WAY over pressure those ejector marks are extreme! Surprised you did not blow primers or worse! Glad you did not get hurt. Absolutely send that rifle back with some of the spent cases and or pictures and detailed info.
My 2 cents. Good luck.
PH
My 2 cents. Good luck.
PH
If that's with factory ammo, then your rifle has a short throat or almost none. I have a 243win that does the same thing. My uni-throater will fix it. You should be able to drop a cartridge in with the barrel facing down, then turn it facing up and the cartridge should fall out. Unless it has a match chamber with a tighter neck.
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Joefrazell
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The bolt face has two ejector plungers
nralifer
Well-Known Member
Well that clearly explains the ejector marks on your brass.
. Not sure what powder Hornady used for their loaded ammo, but it burns dirty. Next step is to thoroughly clean the carbon from the barrel as I outlined and then bore scope again in the clean state to see what the neck looks like
. Not sure what powder Hornady used for their loaded ammo, but it burns dirty. Next step is to thoroughly clean the carbon from the barrel as I outlined and then bore scope again in the clean state to see what the neck looks like
