Glass bedding a Cooper?

[barrowsr]

Hi,

I’ve got a new M21 Cooper in 223 caliber that I’ve been working with. I’ve worked up some loads and have ordered a 35x Leupold target scope for further load development just so I know it’s not me opening up groups. Has anyone experienced a marked improvement glass/pillar bedding their Cooper? I’m not rushing into this because it’s a new gun and I’m sure Cooper would frown on such a thing if I had to return it for any reason. So far at 140 yards which just happens to be my backyard berm distance, I’ve been able to get 10 shot groups down to 7/8 inch with neck resized cases and Sierra Blitz King bullets. I’m happy with the gun but would like to get the most accuracy possible from it. I’m using Lapua match brass but have not neck turned them yet.

Robin

 

[Glenn Powell]

My Cooper came bedded from the factory ??? Are you using the same bullet/powder they use on there test target? 7/8 ten shot group ain't that bad @140 IMO, what are your 5 shot groups? They guarantee 1/2MOA for 5. Make sure to torque the screws proper, 35 front, 25 rear. The only issue I have had with mine is the finish wore off and I had to redo it, I sealed the inletting while I was at it. Good luck

 

[barrowsr]

Glenn,

Thanks for the reply. My M21 had what I would call minimalist bedding. I am using the same bullet and powder that they used for their test target but they don’t go into the amount of powder nor the case and what prep was done to same. I’m definitely going to try it on the bags when the Leupold 36x scope gets here just to eliminate me from the equation. Appreciate the input – good shooting to you.

Robin

 

[Glenn Powell]

Ya might try customer service with an email. Mike is great to deal with and extremely helpful.