Does anyone have any suggestions how to increase the diameter of my Barnes .311 copper bullets? I have a bore that slugs at .3115" my initial ladder test and then test loads within the node are not promising. I think I need to increase the diameter of the bullet. Do you think I should wrap teflon tape around it or dip it in liquified PC paint and size or try to plate it?
Increasing the diameter of a copper bullet
- Thread starter BJung
- Start date
TylerFromMS
Gold $$ Contributor
Don't the lands slug smaller? Like .303?
Sounds to me like time for a new barrel.
jackieschmidt
Gold $$ Contributor
This will help you with the beer.
chuck ‘em up in a collet, drill a 3/16 hole into the back, then press a tungsten rod into it.
Hey, it’s something.
Dusty Stevens
Shiner
How did you measure the groove size and which lab measured the bullet on their equipment?
yes...... tungsten......that's the ticket
Adam in WI
Practically lives here
WTH are we shooting that requires half-thou precision in that bore diameter? Are SMLE's and Mosins shooting bug holes now?
hogpatrol
Gold $$ Contributor
Measured the bullet with a pair of Harbor Freight calipers, finely tuned precision measuring instruments.
You wouldn't believe how many mic's dont even have tenths. I have several
The rifle is a T99 Arisaka and I want an accurate CA hunting round for it. Heavier Hornady bullets group well through it. Boy, those Hammer Bullets are expensive. I forced a lead slug through the barrel and measured it from groove to groove with a Harbor Freight micrometer as .3115". My initial test load was with R19 and I plan to retest using R15 next time. But, the bullet diameter is like the Speer 150-.311 bullets which didn't group well through this rifle either.
Knurling will increase the diameter of the bullets, if you can figure out how to do it.
How fast are you expecting to push these bullets? I don't know how it holds up over about 2400fps, but I powder coat 9MM .355 bullets and then have to push them through a Lee bullet sizing die to get them back down to .357. They shoot well out of my Henry Big Boy.
First, you're almost surely beyond the variance of the HF mic. Heck...measure enough bullets and you'll likely see .0005" variance.
And if that is the difference, it's not likely the culprit.
As was said, Barnes are known to be finicky. My experience is the same...push wm hard and jump em far.
Gotta keep in mind copper solids are light for length when compared to lead. Maybe not the right twist and bullet weight for stabilization.
I'd put the HF mic away and check stability and then do a big seating depth test.
And if that is the difference, it's not likely the culprit.
As was said, Barnes are known to be finicky. My experience is the same...push wm hard and jump em far.
Gotta keep in mind copper solids are light for length when compared to lead. Maybe not the right twist and bullet weight for stabilization.
I'd put the HF mic away and check stability and then do a big seating depth test.
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