Reached a setback in a Stag-10 22-250 project. WWJMBD

[Uisge]

Heat up the receiver threads again and take a 1" wooden dowel to knock it off with a mallet.

Yes this was my plan, although I have a brass drift that I was going to use as opposed to wood. However, after a quick function run this morning I may just leave it alone. Other that 1 stovepipe and one failure to extract with the same ammo it went quite well. Surprisingly it ran a full mag of 5 (p-mag) of S&B 55gr softpoint clean with no issues at all. The Remington 50gr had the stovepipe and the FTE, looking at the brass I feel like a chamber polish may help with these issues. The extractor left a pretty good mark in the brass, and primer flow with that ammo was more than the S&B. It may not be the best choice for this setup. My next test ammo will be the American Eagle 50gr varmint hollow point bulk pack ammo, as soon as I get a chance to swing in and grab some. But so far, I’m impressed that it ran as good as it did. Here’s some pics of the fired brass.

 

[jiffx2781]

^^^ those extractor marks are a good indication that you're overgassed.

 

[Sinasta]

Could also be a over gassing issue. What gas length and do you have and do you have an adjustable gasblock? Also what's your buffer setup?

 

[Uisge]

^^^ those extractor marks are a good indication that you're overgassed.

I also considered that, it’s a mid-length system, which seemed like an odd choice for a 65000 psi round. I am going to off set my gas block slightly and see if that makes a difference, if so an adjustable gas block may be in my future. Or if I can get my gas block closer to centre with good functionality that may be the end solution. I have a DPMS .308 (stubby) carbine length buffer and spring. I may grab a heavy version I spotted last time I was in the shop and give that a try. It was kind of deceptive, the recoil was quite light, as to be expected from a 22-250, and ejection with the S&B was 4-5 feet at 1-o-clock. But choking off the port a bit should tell me a lot about where I’m at. Thanks guys! Hallelujah it runs!

 

[Uisge]

Oh and tip deformation was relatively minimal even with the soft point stuff. On the plastic tips it was hardly noticeable.

 

[Sinasta]

If your brass is ejecting at 1 o clock then you're definitely over gassed.

 

[jiffx2781]

As Sinasta said, 4-5 feet at 1 o'clock means you're running WAY overgassed. Probably even the cause of the FTE and stovepipe you experienced.

And I agree with you that the mid length gas port is a poor choice. There's going to be a lot of gas being sent to the bcg for a long time. It's trying to extract before the pressure has dropped. 100% explains why the extractor is chewing up the rim so bad. Regardless, you should be able to get it running better if you cut the gas flow down. Your idea of moving the gas block to partially cover the port might end up doing the job but an adj block will make adjustments and tinkering much easier.

I would say that the gas system should have been at least rifle length or even longer depending on overall barrel length. Curious what the length of your barrel is?

 

[Uisge]

If your brass is ejecting at 1 o clock then you're definitely over gassed.

Trouble with that is it’s a shorter, tapered case. Also my BCG is a KAK dual ejector. So there are a few variables there you might not see on a 308 variant. I just turned the block back to 12-o-clock, which if it works in this position, would very much alleviate my OCD about the over clocked gas port lol.

 

[Uisge]

As Sinasta said, 4-5 feet at 1 o'clock means you're running WAY overgassed. Probably even the cause of the FTE and stovepipe you experienced.

And I agree with you that the mid length gas port is a poor choice. There's going to be a lot of gas being sent to the bcg for a long time. 100% explains why the extractor is chewing up the rim so bad. Regardless, you should be able to get it running better if you cut the gas flow down. Your idea of moving the gas block to partially cover the port might end up doing the job.

I would say that the gas system should have been at least rifle length or even longer depending on overall barrel length. Curious what the length of your barrel is?

It’s 20” long but with a little over and inch of integral pepper pot brake (that I’m not that fond of personally).

 

[jiffx2781]

It’s 20” long but with a little over and inch of integral pepper pot brake (that I’m not that fond of personally).

If you get the gas slowed down and the rifle running 100% AND the barrel produces accuracy that you're satisfied with I'd suggest having the integral brake cut off and the barrel recrowned with an 11° crown and no threading as a brake will be unnecessary on the 22-250. Of course this is providing that there's still at least 18.5" of useable barrel after it's cut and recrowned.

I think your project is going to turn out to be an awesome coyote getter.

 

[Uisge]

My shooting postition, if you zoom in you can see the brass piled up fairly neatly at around 2-0-clock

The brass pile, couple stragglers a bit closer to my “rest”

The rifle in question

Target, was not shooting for accuracy so much, but I see a bit of promise. Lazered at 59yds.

This concludes my testing for today (out of ammo), the Remington showed extractor marks, less pronounced though, but the S&B was in pretty good shape, still a bit of indent, but again less pronounced. I may tweak it a bit after I see what footprint it left at the port. All in all I think I can start trying some different stuff and may even get off my butt and do some load dev. The Rem stuff was the on target groups, and the S&B came up high and right. The top centre target had 2 rounds walking in for a rough zero then a rather nice group of 3. While hot that Remington ammo seems to shoot well from this rifle.