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Post by Deleted on Jun 13, 2015 12:22:32 GMT -8
I will do that. The remaining issue I have is that extraction is REALLY hard. Whether it's a new round (Copper Creek), a reload using a new case, a reload with a once fired case, or just a new case, I can't get it out without tapping the buttstock on the ground. I've thoroughly cleaned the chamber. Is it possible that the chamber is too tight? Not probable. If it will chamber the loaded round the chamber is not to tight. 60,000 PSI can move brass in every direction. What is most likely going on is excessive case set back. How far are you bumping the shoulder back when sizing? If its factory ammunition, they have to make it one size fits all. Why are you tapping your butt stock on the ground, does your gas system not work? |
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Post by selectw on Jun 13, 2015 12:42:21 GMT -8
I'm tapping the stock to get unfired cases/rounds out as I test the feeding. I think the technique is called "mortaring". Its the only way I can do it as the cases are too tough to extract with the charging handle alone.
The problem occurs with new cases that have not been resized at all, so I don't think the shoulder bumping sounds a likely cause.
There are also very light vertical scratches down the cases, which can be a sign of a rough / tight chamber.
When I fire the gun cases extract fine, but unless I can unload with the charging handle I will have a problem.
Update:
I just took the barrel off (again) and polished the chamber with a bronze brush attached to a drill, using rubbing compound and metal polish. For the first time I was able to extract a couple of rounds using just the charging handle. I may polish it again to see if there is further improvement.
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Post by selectw on Jun 17, 2015 16:12:55 GMT -8
Backing off the sizing die as you suggested worked, and cases can now be manually extracted without too much force. I've polished the lugs and feeds ramps and so most bullet/beck scratching is gone. Only one issue remains - the tip of the bullet is being slightly dinged by the barrel chamfer as it feeds. I polished the chamfer to a mirror like finish and tweaked the feed lips on 2 mags and it still happens. The gun shoots into a ragged hole and then has a flyer. I think the dings may be the culprit. What do you suggest? Thanks. |
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Post by selectw on Sept 4, 2015 17:30:11 GMT -8
I had to send the barrel (plus my upper and bolt group back to BHW) as nothing fixed my feeding issues. They've had it for about a month now and I'm waiting for an update. Fingers crossed because this was going to be my precision rifle match gun.
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Post by devildogandboy on Apr 27, 2016 4:45:58 GMT -8
well? did you ever get this problem resolved?
Bruce
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Post by selectw on Apr 27, 2016 5:28:49 GMT -8
BHW switched the 6mm barrel for a 6.5, which works fine.
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Post by devildogandboy on Apr 27, 2016 13:07:32 GMT -8
just wondering, glad to hear it workd out with happy ending.
Bruce
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