Gunsmithing Ammunition Tolerance

[CRT2]

I've had the chamber on my Remington 700 MDT TAC 21 polished and it improved performance. Previously, 40 rounds in a row stuck. After polishing, still had 6 of 40 rounds "stick". I've had two gunsmiths check the rifle. They fired Winchester and Remington 300 Win Mag and none of the brass stuck in the chamber. They inspected the chamber and the Hornady ammunition and measured the Hornady brass against the Winchester and Remington. They stated the Hornady was thinner and they think pressure within some rounds cause the "stick". Their recommendation is to change rounds or resolve to deal with the stuck cases.
Any recommendations on how to stop the brass from sticking? I have over 700 rounds of the

300 Win Mag 200 gr ELD-X​

[SUP]®[/SUP]

Precision Hunter.​

 

[jetmd]

Advice both good and bad is Free on the Hide.

I would not fight that battle. I would sell the 700rds and move on to a round that works.

For me life is too short for a rifle that doesn't run 100% or a dog that doesn't hunt.

 

[Supersubes]

When you say stick, do you mean a little hard to extract, or the rim gives out and you bang the case out with the cleaning rod?

I dont know that rifle, is it factory?

 

[supercorndogs]

When you say stick, do you mean a little hard to extract, or the rim gives out and you bang the case out with the cleaning rod?

I dont know that rifle, is it factory?

I think the MDT TAC21 is just a chassis system. I was wondering the same thing. I also was wondering about a rough chamber, if a polish eased the issue, it would almost seem to point that direction.

Are you getting heavy bolt lift or ejector marks? What is the rifle specifically? Is it possible the hornady is jammed into the lands?

 

[CRT2]

I think the MDT TAC21 is just a chassis system. I was wondering the same thing. I also was wondering about a rough chamber, if a polish eased the issue, it would almost seem to point that direction.

Are you getting heavy bolt lift or ejector marks? What is the rifle specifically? Is it possible the hornady is jammed into the lands?

The Tactical MDT Tac 21 is complete rifle sold by Remington with a MSRP of $3,100.00 for the 300 Win Mag. Listed on their site under Model 700 Tactical.

Bolt lift is fine and with force, not just extra pressure the fired brass extracts. No case separation. The polished chamber improved the issue. Gunsmith did not want to polish further since the rifle is shooting 1 hole at 25 yards during his maintenance and testing. Off a sandbag at 100 yards I managed a 10 shot .7 inch group with the ELD X. BC on the round is .626 and 5 shot chronographed average was 2850 fps.

Hornady is working with me to see if it is the lot of ELD X.

Was hoping we missed something as we have gone through the process to fix this - something like replacing the bolt with a PT&G bolt.

Thanks all for the input.

 

[Mike Casselton]

Primary extraction?
Hold a piece of shim stock where the bolt contacts the receiver and if it eliminates it, there's your problem.

Maybe even measure for a gap there

 

[DAVETOOLEY]

Probably needs the bolt handle moved to increase primary extraction. If that 's the case there is nothing else you can do eliminate the problem. Start there.
There is an outside chance it could be the brass but not because it's thinner. From time to time I see new brass where the side walls are not straight. It's bulged out in the middle causing an interference fit in the chamber before firing. Which means, after firing the brass it's even tighter in the chamber .

 

[CRT2]

Probably needs the bolt handle moved to increase primary extraction. If that 's the case there is nothing else you can do eliminate the problem. Start there.
There is an outside chance it could be the brass but not because it's thinner. From time to time I see new brass where the side walls are not straight. It's bulged out in the middle causing an interference fit in the chamber before firing. Which means, after firing the brass it's even tighter in the chamber .

Spoke with several gunsmiths and explained the primary extraction issue and they didn't seem to understand - possibly my description of the issue was the problem. Anyway, e-mailed ACCU-TIG and received guidance from Dan Armstrong on what was needed for him to correct the problem. Had one gunsmith make the needed measurement and another verified the gap as .041. From what I can find a properly timed Remington 700 should have between .005" and .010" gap between the handle and the rear bridge.

The bolt and handle are on their way to Alaska to be fixed.​

 

[CRT2]

Turn around from ACCU-TIG was 2 days. The primary extraction issue has been resolved. Bolt extracts rounds with normal effort. http://www.accu-tig.com/