New barreled action, heavy bolt lift after firing

are you jamming the shoulder of the case into the chamber? is it easy bolt close?

also when you take a round and chamber it, close the bolt and then open the bolt is it heavy at all, or only heavy when lifting the bolt on a fired case.
 
A few very knowlegable people replying in this thread.
My 1-10" twist has very little in common with what these young kids are shooting these days.
I'm just here to learn.
 
Potashminer said:
From your picture - I do not think those primers are showing excessive pressure, but definite smears on the case heads - is there a burr or something on your bolt face's ejector hole?

The "smears" that I have experienced are more like round shiny spots - I believe the brass was flowing into the ejector hole upon firing, then got sliced off when the bolt was opened - yours look more like a smear that was "wiping" along that brass.
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I had similar looking brass with my current BRA barrel. I was getting all my new brass messed up. Load combo should have been no problem ( same load as other barrel)
I was just fire forming virgin BR Lapua brass. Scratched my head for a bit went home to figure it out and double check things. I ended up chambering a couple of rounds
to measure bullet jump and there were the same marks on that brass. I then chambered some factory Lapua BR rounds and same marks. I feel the ejector was sharp and the 4 thou crush
they allowed in the chamber was the problem. I bumped the factory brass 3 thou and the marks went away. Everything was good for all loads brass after that.

My problem was more aesthetic. Hope you figure it out. Keep us updated
 
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crowellsr said:
I do not. PVA is very secretive with their chamber dimensions. It's supposed to be optimized for the heavy bullets is all they really say.
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I have a 6BR. Krieger 1:7, groove diameter is .236, using Lapua case and shoot 109gr berger bullet, 27.3gr N140, fps 2800, hot summer up to 2950+. I hope you can refer to some of my data.
the neck diameter of the chamber is 272 and fired case neck diameter is 270. neck tension sets to 268. the bottom of the bullet bear surface just touches the neck becase only .104 freebore.
I also had similar looking brass and occasionally encounter heavy bolt lift. The problem I had was that the diameter of the primer porket would get larger by 0.0005 after each shot. New brass only can reload 5-6times. but it's a laser beam.
 
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Looking at the photo again, after getting out and shooting my 6 BRA for the first time in 6 months, I'm of the opinion that you are seeing normal usage marks. Nothing to be concerned about.

Please ship the "damaged" brass to me instead of throwing it out.
 
adamg said:
Looking at the photo again, after getting out and shooting my 6 BRA for the first time in 6 months, I'm of the opinion that you are seeing normal usage marks. Nothing to be concerned about.

Please ship the "damaged" brass to me instead of throwing it out.
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I person there are actual burrs that have been peeled up on the brass that isn't visible in the pictures
 
crowellsr said:
I person there are actual burrs that have been peeled up on the brass that isn't visible in the pictures
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I would explain that as sharp edges on your action (bolt).
I chambered a round, and then took it out by opening the bolt, and it had the swipe marks on the case headstamp.
 
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