polishing a rough chamber

todd

todd

Well-Known Member
in my '98 Mauser has a sort of rough chamber. instead of taking to my gunsmith to put on a lathe, i'm going to take a drill and a slotted dowel and i'll put a piece of Scotch Bright on it. if that don't work, then i'll try 320 grit. then if all else fails, to the gunsmith i go.

there is a small vertical elongation, or like hair like, in the chamber. oh, i took '06 brass and i reformed it to 8x57. i fired the 8x57 and it got stuck in the barrel. i had to take a rubber mallet to the bolt action to turn it. then a cleaning rod to take the bolt and brass out. i looked at the brass and i found the scratch mark. using my calipers, i found out that i should turned the outside of the neck. it was .003 to .004" above the neck dia. so i got the Forster neck turner out and turned the cases.

i shot the 8x57 again and they cycled perfectly, but i seen the case was scratched, again. :angry: the first thing i did was to clean it again and this was time i noticed a "hair like" elongation. i took the bolt out and i put on a brass brush (444 Marlin brush) on the pistol cleaning rod and i spent about 3 hours using Kroil on the brass brush and the chamber. i got most of it off, but i can still see it and it still does scratched the brass (3rd shot). so i decided on the electric drill, slotted dowel, scotch brite and 320 grit.

someday i get this 8x57 shooting again.
UtAtRXw.jpg
 
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CWLONGSHOT

CWLONGSHOT

Well-Known Member
I know OCD can be a killer. But I make allotta 8mm brass from mil '06 cases. Easy peasy. So it sounds like you have function your just marking cases. I suggest ya leave the readers home when shooting it, and just enjoy that pretty rifle. :cool: :cool: :cool: ;)
 
358156 hp

358156 hp

At large, whereabouts unknown.
It looks like you tried to add a second picture but it didn't take. was there supposed to be a pic of the case?
 
JonB

JonB

Halcyon member
todd said:
SNIP>>>

there is a small vertical elongation, or like hair like, in the chamber. oh, i took '06 brass and i reformed it to 8x57. i fired the 8x57 and it got stuck in the barrel. i had to take a rubber mallet to the bolt action to turn it. then a cleaning rod to take the bolt and brass out. i looked at the brass and i found the scratch mark. using my calipers, i found out that i should turned the outside of the neck. it was .003 to .004" above the neck dia. so i got the Forster neck turner out and turned the cases.

i shot the 8x57 again and they cycled perfectly, but i seen the case was scratched, again.
Click to expand...
This sounds like a high pressure event.
I wonder what the chance is, that you cracked your barrel?
I think I'd take it to a gunsmith or someone with a rifle endoscope for a close looksie, before you shoot it again.
That's my 2¢
 
todd

todd

Well-Known Member
JonB said:
This sounds like a high pressure event.
I wonder what the chance is, that you cracked your barrel?
I think I'd take it to a gunsmith or someone with a rifle endoscope for a close looksie, before you shoot it again.
That's my 2¢
Click to expand...

it is more of a bump in the chamber. i'm guessing that it was made this way and the guy(s) wasn't a reloader. if it don't come out, then i will try my gunsmith.
 
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JonB

JonB

Halcyon member
todd said:
it is more of a bump in the chamber. i'm guessing that it was made this way and the guy(s) wasn't a reloader. if it don't come out, then i will try my gunsmith.
Click to expand...
Oh, I was assuming the scratched brass was a new occurrence after the high pressure event...figuring it wasn't happening before. I didn't know that this rifle is new to you, maybe you mentioned that in another thread?
 
todd

todd

Well-Known Member
this is a picture of how i bought the 98 Mauser.

Jffxv4e.jpg

zbEOs5d.jpg


when i was stripping it down to clean it, the stock was filled with black mold in the action. there was water damage, so i decided to try a Richard's Mico gunstock. the rifle was bought on an online auction for around $150. the Richards gunstock was around $250-275.

sbYV70e.jpg


CWLONGSHOT said:
I know OCD can be a killer. But I make allotta 8mm brass from mil '06 cases. Easy peasy. So it sounds like you have function your just marking cases. I suggest ya leave the readers home when shooting it, and just enjoy that pretty rifle. :cool: :cool: :cool: ;)
Click to expand...

i'm trying to get of OCD, but.......

i have 3 or 4 shopping bags full of once fired '06 cases. Remington, Winchester, Hornady, Military, Federal.....you name, i probably have it. it was the first time i needed to turn the necks. i guess the chamber of my 9.3x57 is a little wide in the neck.
 
todd

todd

Well-Known Member
JonB said:
Oh, I was assuming the scratched brass was a new occurrence after the high pressure event... the rest of them figuring it wasn't happening before. I didn't know that this rifle is new to you, maybe you mentioned that in another thread?
Click to expand...

it's possible that a previous owner had a high pressure event. this was my first time firing the 8x57. i started out on a minimum load to fire form it. i only have 3 cartridges that are scratched. i took the "eraser" (bullet puller) to the rest of my cases (7 of them) and i started to neck turn (50 some cases).
 
Tomme boy

Tomme boy

Well-Known Member
Use the Remington brass to form the 8mm. It is thinner walled so you will not have to turn the necks. Some lots of Win are the same but it varies. I had a custom 8mm built and I used almost all Remington brass to form. What was really strange was if I used actual 8x57 Remington brass My die set would not size it far enough to hold a bullet. So I had to go back with a neck die to size it and then it was fine. But the 06 brass seemed to shoot the best out of all the brands I had.

That was one rifle I still wish I did not sell. It would shoot the Sierra 200gr hpbt into a 0.2" group at 100yds and a 0.3" at 200yds. Using Yugo 198gr pulled bullets it was a 3/4" gun. At the time that was $65/case from Century Arms. The Turk bullets shot about 1.25"
 
fiver

fiver

Well-Known Member
if you just want to polish the chamber wrapping a fairly tight fitting brush with steel wool will generally do the trick.
i've done a few shotgun chambers that way.
the scrubby pads will do it too, and they come in different grades. [most people don't know they are colored for that reason]
 
smokeywolf

smokeywolf

Well-Known Member
fiver said:
if you just want to polish the chamber wrapping a fairly tight fitting brush with steel wool will generally do the trick.
i've done a few shotgun chambers that way.
the scrubby pads will do it too, and they come in different grades. [most people don't know they are colored for that reason]
Click to expand...
Brown=Course; Red=Medium; Gray=Fine.
 
JonB

JonB

Halcyon member
"scrubby pads will do it too, and they come in different grades"
.
"Brown=Course; Red=Medium; Gray=Fine"
.
I have green ones?
 
todd

todd

Well-Known Member
i used a green scratchy pad, slotted dowel and my electric drill to smooth up the chamber. i got most of "bump" out. i will try shooting the 8x57 to see if the chamber is still "scratchy".
 
JonB

JonB

Halcyon member
I am pretty sure my green ones were sold for Kitchen use, but they are 3M brand.
.
well, I just had to google the color code.
.
"We can't speak for every single manufacturer, but here's the basic industry code:
A white pad is extra-fine, approximately equivalent to 600-grit sandpaper;
gray compares to 220-grit;
maroon, 150-grit;
and green, 100-grit. "

from:
www.woodmagazine.com

Color holds the key to abrasive pads

Q. What is the color-grading system for nonwoven abrasive pads? I'm never sure which color is the best choice for a particular job.
www.woodmagazine.com www.woodmagazine.com
 
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