POI Shift Head Scratcher

[M-61]

And the original barrel?

 

[Cfshooter]

And the original barrel?

Original barrel hammers.

 

[Ggmac]

Possible burr o recoil lug or on receiver face . Probably on the top

 

[M-61]

Original barrel hammers.

Don’t know what that means.
I’d like to see the original go on and see what happens.
Assuming the Shilen barrel is ok (?) this problem reeks of something loose.
You’ve swapped scopes and stock.
Swap shooter if possible or practical.
Man I just wouldn’t buy anything.

 

[ShtrRdy]

Hmm, how would I check that? Wouldn’t it not headspace then? I would love to check though.

If you have or can get ahold of some small diameter solder, (basically a small piece of lead), attach it to the bolt nose with a little grease. Insert the bolt and close it. If the bolt nose is close to the barrel the lead will be smashed down. The lead will retain the thickness it had to be flattened to.

What we're looking for is at least 0.005" of clearance between the bolt nose and barrel.

 

[MGYSGT]

Common problem. I have a top brand, in fact two of them and they do the same thing. Start out on target and move as they warm up and get dirty. Just hold off as it happens.

 

[Big Mc]

Here is a good one. I have a Shilen 6 dasher 26” .800 muzzle barrel that I screwed onto a savage action. It shoots tight but POI seems to shift down as session goes. Ended up about 1.5 moa lower last range session of 25 rounds. Even after barrel cools for 20 minutes the POI is still low. The next range trip POI starts back normal and after a few 5 shot groups it starts working down again. I shoot groups slow and let barrel cool between but seems to “flex” into a new “place” as session goes on. Groups stay tight as well. So far I have had 3 range trips with it (about 80 rounds total) and happens each trip.

I swapped stocks and glass again, same issue persist. Target pic of last trip below. I also attached the chrono results, it is not from velocity change, and you can see the 20 minutes between groups to let barrel cool some.

Thoughts? Just a lemon barrel? I have had barrels change POI some and groups have open up when some barrels get hot, but this POi continues to get lower as a session goes but groups stay tight.

Whay the Boss said. Tommy Mc

 

[Old Navy]

Which Savage action do you have?

 

[jpjulian]

Since you've eliminated the scope as suggested, I'd get the barrel frozen/Cryo treated which should relieve the stresses in the barrel. Smoothing the face of the barrel nut is a good idea too.

 

[Ned Ludd]

You don't by any chance live near an oscillating black hole do you?

 

[47WillysGuy]

Most barrels usually work, then sometimes some barrels will not.

 

[Cfshooter]

Which Savage action do you have?

It’s a 12FV

 

[Cfshooter]

You don't by any chance live near an oscillating black hole do you?

I think so, going to try and hunt it next spring.

 

[Cfshooter]

Most barrels usually work, then sometimes some barrels will not.

I’m thinking this may just sum it up. A spoke to Shilen yesterday, they need more peeps to discuss this with as he had no answers either.

 

[Sandstorm]

I think Keith hit it on the head. ( Cryo option ) but it may not be a fix all either.
Im leaning in this direction.

 

[butchlambert]

Since you've eliminated the scope as suggested, I'd get the barrel frozen/Cryo treated which should relieve the stresses in the barrel. Smoothing the face of the barrel nut is a good idea too.

Cryo is BS! It was a passing fad.

 

[Old Navy]

It’s a 12FV

Have you tried different torque setting on the screws? Don't know how effective it might be on a two screw but it is important on a three screw.

 

[Cfshooter]

Have you tried different torque setting on the screws? Don't know how effective it might be on a two screw but it is important on a three screw.

That i did. With the first stock I tried 30/40 - 40/40. Second stock 40/50.

 

[Sandstorm]

I was just passing bad info then Butch...as I have no experiance with cryo.
Disregard my post Mr cfshooter.

 

[jpjulian]

Cryo is BS! It was a passing fad.

I respectfully disagree but at least it can hurt nothing and may help his traveling groups.