Need help! Rifle shootimg way off!

[flassen]

To ny knowledge no one has answered the carbon ring question yet. It generally forms 1-2 inches forward of the throat. It is possible to form more forward but not as likely. It will be noticeable with a bore scope.

 

[rcg5076]

I have a Remington 700 204 ruger. I've had it for about 10+years. Nothing done to it with the exception of a better stock and muzzle break. It has a varmint profile barrel. This gun shoots normally like a laser. But this last time I had a round blow out a primer and now the bullet placement are everywhere. So bad I sent my scope in thinking the reticle was jacked up somehow. It came back as no issues found. Went today and bullets are again all over the target. If I were to guess how many rounds I have through the barrel, I would say about 1000 to 1500. Most factory loads too. I measured about 8 inches off at 100 yards. About 3.5 inches at 25 yards. Any suggestions are appreciated.

Is the new stock binding on the barrel? Was the stock screws torque correctly? I have had two rifles do this to me in the past. One of them was Rem 700 in 22-250, which was a tack driver. If you over torque the stock screws it would shoot like you discribed. Blowing primers is a sign of excess pressure. Improper loaded ammunition, obstructions, or heat are the causes of excess pressure in a bolt gun.

 

[smokin502]

Is the new stock binding on the barrel? Was the stock screws torque correctly? I have had two rifles do this to me in the past. One of them was Rem 700 in 22-250, which was a tack driver. If you over torque the stock screws it would shoot like you discribed. Blowing primers is a sign of excess pressure. Improper loaded ammunition, obstructions, or heat are the causes of excess pressure in a bolt gun.

Sorry , the stock has been changed but has been on the gun for 9-10 years. In fact I was starting to look for a MDT chassis until this happened.

 

[Slibey]

Carbon rings are slow build up usually. My 7mag started losing accuracy , got a ore scope , yeah heavy carbon up almost six inches. Cleaned for three days after rang shooting but didn't help carbon. Got carbon cleaner worked it for several days much better wasn't shot out. Also no blow primers. But sure pressure was changing and messing with accurracy

 

[smokin502]

Here some pics with my bore scope, it's too big to go down the barrel. The pics are brake, bolt face and throat somewhat. The best pics I can get.

 

[smokin502]

I cleaned the brake real good and will leave it off until I confirm fix or not.

 

[smokin502]

Inside of the bolt body pics

 

[rcg5076]

Looks like copper build up in the barrel. This could be killing you accuracy and causing pressure spikes. I uses Bore Tech copper remover on my rifles.

 

[smokin502]

Well shot the 204 today and no changes. Cleaned out the brake real good with no change, then removed the brake and still the same. Took apart the bolt and didn't see any issues. I'm going to fully take apart the gun and hopefully I can find something.

 

[jarnold37]

Well shot the 204 today and no changes. Cleaned out the brake real good with no change, then removed the brake and still the same. Took apart the bolt and didn't see any issues. I'm going to fully take apart the gun and hopefully I can find something.

Have had more than one rifle that the bedding just went bad. Even on a rimfire target Anshutz it just went bad all at once. Might check that as it is fairly common and overlooked.

 

[Bob Wright]

1k-1.5k total rounds. I usually go shooting with my sons and they shoot 50-100 rds while out. I'll bring it home and clean before putting away.

That carbon ring is at the end of the brass cartridge, in your chamber neck. That carbon deposit will act as a pinch on the end of the brass causing pressure spikes.

 

[DDWing]

I have a Remington 700 204 ruger. I've had it for about 10+years. Nothing done to it with the exception of a better stock and muzzle break. It has a varmint profile barrel. This gun shoots normally like a laser. But this last time I had a round blow out a primer and now the bullet placement are everywhere. So bad I sent my scope in thinking the reticle was jacked up somehow. It came back as no issues found. Went today and bullets are again all over the target. If I were to guess how many rounds I have through the barrel, I would say about 1000 to 1500. Most factory loads too. I measured about 8 inches off at 100 yards. About 3.5 inches at 25 yards. Any

 

[WildRose]

I have a Remington 700 204 ruger. I've had it for about 10+years. Nothing done to it with the exception of a better stock and muzzle break. It has a varmint profile barrel. This gun shoots normally like a laser. But this last time I had a round blow out a primer and now the bullet placement are everywhere. So bad I sent my scope in thinking the reticle was jacked up somehow. It came back as no issues found. Went today and bullets are again all over the target. If I were to guess how many rounds I have through the barrel, I would say about 1000 to 1500. Most factory loads too. I measured about 8 inches off at 100 yards. About 3.5 inches at 25 yards. Any suggestions are appreciated.

You need to get it to a gunsmith.

The .204 is notorious for both building up a carbon ring that can cause catastrophic case failures and for burning throats out.

I thought I'd shot the throat out of mine and was planning to rebarrel when I sent it to my smith to inspect. He said the fire cracking I was seeing wasn't as much erosion as it was a huge buildup of carbon.

He taught me a few ways to deal with a carbon ring but this one was so bad his helper worked on it an hour a day for a week or more and finally got it out. I was just too busy to put that kind of time into it at the time.

Either way I would not fire yours again without first having it inspected by a qualified gunsmith. I say that not just as a five decade shooter of high velocity varmint killers but also as a certified and licensed firearms instructor. This is not something I would screw around with at all.

 

[WildRose]

Bolt face looks normal. Not sure where a carbon ring would be but this gun gets about 50 to 100 rounds tops then gets clean pretty good. Not sure. Bore scope is too large to fit inside this barrel.

You should see the ring just head of the chamber in the first 2". If it's really bad you won't even need a borescope to see it.

I can't emphasize enough you need a good gunsmith to inspect it before you even consider shooting it again. Blowing primers means bad things are already happening and the next shot could be exponentially worse.