Fixing a crown the “Funky Way”!

462

California's Central Coast Amid The Insanity
No experience with a marble, but my 1901 dated Swede somehow developed a muzzle ding, and I used a large round-head brass screw chucked in a cordless drill, and fine compound (340 grit?). The grit was fine enough that further polishing wasn't necessary, before bluing with Oxpho.
 

oscarflytyer

Well-Known Member
I have ALWAYS heard the brass screw/compound method - and used it to good results. But along the way somewhere, someone suggest the glass marble method. Again, NOT tried it, but... It certainly makes logical sense to me, and have even thought about trying it on ok muzzles just to polish them up some.
 
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fiver

Well-Known Member
I think I'm working on my third forever rifle.
once I get the stock length and scope situation worked out on 2 of them I'm pretty locked in on them forever.

the first has been hunted hard and shows it, it's also the most plain jane looking rifle on the planet.
birch stock, push feed, Winchester model 70 that started life as a 270, then got changed to the 7X57 ICL, I had the throat on the 5-R barrel cut for 140gr. bullets.
it has literally taken everything from bunnies to moose with the Hornady 139gr interlock at an easy on the brass 2880 fps. [measured at 10 feet]
it needs the stock length adjusted to fit me a touch better to get it back in the rotation.
I picked it up dirt cheap in a box because the guy had it halfway done stopped short of the barrel change and final ream when he stopped being above room temperature.

the second is the 25-06 built on a BRNO action with a slower twist rate for 100gr bullets, that I fit a Huber ball trigger to.
it was intended as an antelope rifle, and for the occasional rock chuck that was smart enough to stay 300yds. away.
never bothered with the Antelope after seeing them day after day after day, and deciding it would be more of a drive out and shoot affair rather than a hunt.
it is a heck of a deer rig though.

the third is the Bergara 30-06.
I have everything lined out on it, but the scope situation, to make it a forever package.

all three of them are top notch under 1 moa any day all day rifles with their hunting loads,
you can't ask for anything better than that for big game, and I really don't need anymore besides the varmint rigs I already have.
anything I put together from here on out will be for the 2 G-kid's future use.
 

Joshua

Taco Aficionado/Salish Sea Pirate/Part-Time Dragon
Interesting, do know why it’s called the Tortilla?

Wikipedia entry:

“7mm ICL Tortilla​

The Tortilla is an improved 7x57. Performance with a 100-grain (6.5 g) bullet is approximately 3,200 ft/s (980 m/s) and with a 117-grain (7.6 g) bullet is approximately 3,040 ft/s (930 m/s).”
 

fiver

Well-Known Member
flying tortilla is also another name.
the case is blown out from the base to the shoulder with [I'd have to measure] just about no taper and the sharp angled shoulder.
from the side the case almost looks square with a neck and bullet sticking out the end.

I've broke 3-K with a 140gr Interbond.
a one deer test ending with it being turned sideways and slamming down on it's side and me losing all of one shoulder and half the other one at some over 100yds,,, I gave up on that [expensive bullet]nonsense.
 

Joshua

Taco Aficionado/Salish Sea Pirate/Part-Time Dragon
Well I definitely didn’t hurt anything by cleaning up this crown. Everything feels tighter.

Here are some targets from yesterday.
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Best group of the day was with these tumble lubed bullets. Shot prone off of a bag.
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I’m pretty happy with the 180gr Partition load over 60gr of Norma MRP. Looks like eight holes, but two of them are slightly ovalized from a second bullet. A relatively tight group with one flyer. I think that the flyer was the first shot after shooting the lubed bullets, so I’m blaming that one on bore condition! 2 1/8” minus the flyer. Prone off bag.

I had some very old Remington UMC 180gr Palma Match that I shot at 300 yards. I was really struggling to see this target through my 4X 1970’s Tasco Scope. Wind was blowing when these were shot. Ten shots at 11 3/4” isn’t very good. Shot from tree stump rest.
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This was with the last five rounds of that Palma Match, at 180 yards. 4 3/16” was surprisingly good considering the earlier 300 yard group. Breeze was light and there was a thick black bungee cord across the target that I lined up my horizontal crosshair on. Wind conditions and good targets make all the difference it would seem. Shot prone off of a bag.
 
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JWFilips

Well-Known Member
I always use Brass round headed bolts With medium and fine valve compound..... However I only use an old hand crank brace!
The reason is the brace is not only turned around but it is wobbled slightly left and right as I turn it ! Also I walk back and forth around the barrel as much as I can. This randomness is why it works so well.
You get a far more consistent crown by using the turn and wobble maneuver than a straight rotation of and electric drill. Been doing it this way for 45 years and did near 100 barrels Takes a bit longer but you can't mess it up
Push a piece of cloth about 1 to 2 inches into the muzzle so you can push out the residue from the breech when you are finished
 
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