Sudden high pressure???

[Hoier]

I just started running a ladder with rl15 and 108s and I blew out a primer at 31.8 which seems WAY light. So I figured I must have a real fast lot of rl 15. So I went home and tried some Varget started at 30.5 and had up to 32.6. Today I blew a primer at 30.5. Well I have no idea what's going before I had Hybrids shooting over 32.5 gr with no signs of trouble. Well I got home today and got to thinking I might have a carbon ring so I scrubbed that. Now I'm curious what else could be causing this?

 

[Hoier]

It's a Dasher and the barrel has about 1400ish rounds.

The reason I'm trying a different load is I was getting a flier on every target and I seen where Wagner stopped shooting the 105 vld cause he was getting fliers so I figured I would give it a try.

 

[gmitchell]

Have you ever heard of a carbon ring? Try some JB or Isso with a tight jag and just work the throat area.

Gordy Mitchell

 

[22BRGUY]

What Gordy said.

 

[Hoier]

I think I got her figured out. It was a carbon ring. I measured the neck of a fired piece of brass and it was .2675 and my loaded ones are .267.

How's it goin Gordy? I haven't talked to you in awhile.

 

[savagedasher]

When you jam or start in the lands I always add 5000 psi to the start pressure. to give you any answer I need to know water capacity and over length of loaded round along with in or off the lands.i will run it on Quick load

 

[savagedasher]

Barrel length would help also

 

[Hoier]

I don't run jam on this rifle. But I think I have the problem fixed. But geez my 6br can handle 30.5.

 

[Hoier]

I appreciate it though Savagedasher!

 

[22BRGUY]

Also may want to check your case length and neck diameter if you haven't already. I do chamber casts with Cerrosafe so I know the actual dimensions of the chamber and can trim/turn as it needs.
Best to you.

 

[expiper]

Hoier,,,,the thing you really need to check is how you clean the bbl.!!!!! If you are getting a carbon ring in the chamber you are not cleaning it properly or frequently enuff,,,,tell us what your cleaning routine is?,,,,there is a lot lof snake oil out there on the market that doesnt work!!!...and there is no substitute for elbo grease when cleaning your gun,,,,Roger

 

[Hoier]

Well I was just running patches of Montana Extreme till they came out clean but now I learned my lesson. So now I'll be using J-B everytime I clean and I clean about every 80-100 rounds depending on the match.

 

[expiper]

Hoier,,,everyone has his fav. method,,,mine involves a bronze bristle brush!!!,,,,Roger

 

[LIUNA]

I had the same problem and I used a little larger bore brush and detected it. although I had just ran a clean patch before. the larger brush brought it out.

 

[mattlewis]

I used a 6mm brush to start with (one of the nylon ones), and it was very tight. Went with a 7mm and carefully worked it through the chamber area with JB a couple dozen times. Went back with the 6mm, and it was much better.

I got a significant amount of carbon on my brushes. After a very thorough cleaning with the brushes and JB, mine is back in business after experiencing similar problems.

Good luck.

 

[Hoier]

I won't be able to check if the j-b worked till Friday night but will let you guys know what I came up with but after running the j-b it sure feels a lot better.