I was going to chamber a new barrel blank today. .236 ,4 groove, 31", 1 1/4 STR. I noticed the bore was tight every 2" on the entire length of the barrel. Maker said to send it back for a replacement. Does anyone have an idea of why that would happen during manufacture ? Maker said ,the time to send it back was before any cutting was done on it , so that's what I did. My previous barrel from the same maker had the same condition, only not so noticeable. I did chamber that one ,and it would shoot 1/4 min. I just don't think a new barrel should have those issues, so back it went.
Tight spots every 2'' on New barrel bore
- Thread starter noload
- Start date
I had a new custom sporter barrel (#5 ish) maybe two years ago that was like a washboard. I cast several laps and lapped the barrel and was never able to get it completely cleaned up...it was a constant tight/loose every inch or two. That said, the 300 win mag I chambered in in and installed on the Weatherby action shot awesome. It was a button barrel, and I'm pretty sure it was just a poor final ream before rifling. Customer had already decided to have me lap it before I realized it was so bad so I just stuck with it. He was very happy with it so it was all good. I'm sure the maker would have made it right but i was supplied all of the components by the customer and used what he gave me.
Dusty Stevens
Shiner
Life is too short. Even the best make mistakes- its how they handle it that makes the difference
I can theorise until the metaphorical cows come in.
Cut rifling, a consistent-ish pattern like that would suggest that the cutter only developed enough force to cut X length at X pressure and the machine was undersized/ worn enough that it couldn't maintain X pressure start to finish.
I can theorise until the metaphorical cows come in.
Cut rifling, a consistent-ish pattern like that would suggest that the cutter only developed enough force to cut X length at X pressure and the machine was undersized/ worn enough that it couldn't maintain X pressure start to finish.
DaveTooley
Gold $$ Contributor
He didn't say it was cut rifling.
I assume you were pushing a tight patch with a cleaning rod that had ball bearings in the handle?
I assume you were pushing a tight patch with a cleaning rod that had ball bearings in the handle?
Liven The Dream
Gold $$ Contributor
Pac-Nor States they Can ???
They are in Oregon Lot of people like them .
No he said button. Which would be either cut or deform.
He also said he was using cast lapps.
Someoldguy
I ran into this condition once on a factory rifle, tight spots were at every dovetail cut and stamping. So the reasons were obvious. I've not yet found a case such as this on a barrel blank.
DaveTooley
Gold $$ Contributor
We're reading different posts. Go to post #1 and tell me what it says. No mention of barrel maker, production process or using a lead lap. Not sure you're from around here.
L.Sherm
Silver $$ Contributor
Ive seen barrels that were drilled like driving down a washboard road and then when there bore reamed it doesn't ream the imperfections out, that could very well be what happened.
Douglas makes a .236 and .237 4 groove 6mm.
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