Er shaw 7mm bore

[49willys]

Worth lapping or replace?

 

[troy fairweather]

How's it shoot.

 

[49willys]

How's it shoot.

Terrible

 

[troy fairweather]

Need more info, what is it on, round count, bedded or not, it's it cleaned, ammo what you shooting and how terrible. Could try recrowning,

 

[Armorer 101]

Could be anything, unless you strip the bore back to bight steel. It looks like machine marks but. Remove the barrel and action from the stock, plug the chamber and fill the barrel with Shooter’s Choice Copper Solvent, let it set for 7 days, after 7 days scrub the bore with a bronze brush, patch with dry patches until white. Then examine the bore again.
To try to save it, if it still has machine grooves after the copper strip, you could try fire lapping with cast bullets, as cast, lubed with valve grinding compound of differing grit starting with 3-400 and going to 1200. Use a light load, like 8g of Unique. Only thing is you could have a nice shiny oversized bore that shoots cast, sized to the groove diameter real well.
Other option is to order a new barrel, cut to fit your action and chambered in 7x08 to go back as you are in cartridge. If you do not want anothe Shaw, talk to the folks at McGowen.

 

[49willys]

Need more info, what is it on, round count, bedded or not, it's it cleaned, ammo what you shooting and how terrible. Could try recrowning,

Its a brand new 7mm08 savage barrel with 60 rds of norma whitetail 150 gr.through it.9.5 twist should stabilize that bullet.its not bedded but is floated.shoots 4"groups.it has a newer burris e1 scope on it all screws tight with blue loctight.
I cleaned the barrel with kg 12 followed by bore bright.shouldnt be any copper in it.
Its very possible the barrel just doesnt like the norma ammo,my biggest question is if those tool marks can be lapped out without ruining the barrel,they look deep.And how would the same machine marks on the lands get in the grooves?

 

[Ru4real]

I agree, it looks pretty clean, and as you said, fairly new. Is it too late to contact ER Shaw to get a replacement? Send them the photo if you can.

I put an ER Shaw 0.358 x 24” SS on a Savage II about 6 months ago. This primer test shows typical groups.

View attachment 1045957

 

[49willys]

I agree, it looks pretty clean, and as you said, fairly new. Is it too late to contact ER Shaw to get a replacement?

I didnt know they had a warrantee,maybe I can call monday and talk to them

 

[rbernie]

Shaw barrels will always show some chatter marks from the rifling process, but that does look a little more dramatic than usual. I don’t think that it can hurt to send that picture to Shaw and ask them if they will warranty the barrel.

I have never lapped a barrel once it has been chambered or crowned, because everything I have read has led me to believe that it is impossible to lap the barrel without excessively wearing the two ends of the barrel while it is being lapped. I am led to understand that any manufacturer who offers a lapped barrel will perform the lapping on a barrel blank that is cut long, and cut the ovalized ends off the barrel, once the lapping has been completed, before chambering and crowning.

 

[Blue68f100]

Lapping will not do much good to that barrel. The tooling marks look too deep. Lapping only smooths out the roughness. Brownells sells a Non-embedding bore lapping compound. I've used it on several new barrels that were copper fouling.

 

[Oldschool shooter]

Looks rough as a corncob. I would contact Shaw for a replacement. Hope they step up and do right by you.

 

[LoonWulf]

That does look unusually rough for a Shaw barrel, And their barrels don't usually look fantastic to begin with lol.

I use them a lot and I've never had one shoot poorly though, I definitely contact them and see about getting it replaced or at the very least looked at.

 

[edwardware]

Er shaw 7mm bore

Its a brand new 7mm08 savage barrel

Is it an ER Shaw barrel, or a Savage barrel? They really aren't the same, and there's no reason to conflate the two. Pick one.

If it's an ER Shaw barrel, I'd expect they'll replace it. If it's a Savage barrel, that's normal.

 

[49willys]

Is it an ER Shaw barrel, or a Savage barrel? They really aren't the same, and there's no reason to conflate the two. Pick one.

If it's an ER Shaw barrel, I'd expect they'll replace it. If it's a Savage barrel, that's normal.

Oops savage action,shaw barrel

 

[edwardware]

Oops savage action,shaw barrel

That seems excessive for an ER Shaw barrel.

. . . if those tool marks can be lapped out without ruining the barrel,they look deep.

Lapping won't remove them, but will certainly reduce and smooth them. Will it turn your 4" group into 1"? Very likely not.

 

[Skylerbone]

Shaw barrels will always show some chatter marks from the rifling process, but that does look a little more dramatic than usual. I don’t think that it can hurt to send that picture to Shaw and ask them if they will warranty the barrel.

I have never lapped a barrel once it has been chambered or crowned, because everything I have read has led me to believe that it is impossible to lap the barrel without excessively wearing the two ends of the barrel while it is being lapped. I am led to understand that any manufacturer who offers a lapped barrel will perform the lapping on a barrel blank that is cut long, and cut the ovalized ends off the barrel, once the lapping has been completed, before chambering and crowning.

You won’t get the consistency of a factory lap, and they use one sized to the bore rather than a short, bore diameter brush pushing compound. Still, I’ve had some mild success after lapping compound, with my primary purpose being a deeper cleaning than basic CLP. Could be the clean bore shot better, or the lapping helped, or some combination thereof in squeezing out a tiny bit of accuracy.

 

[Skylerbone]

OP, if that were my barrel I’d just shoot it with different loads for testing and call if nothing produces good results.