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honing a Mosin chamber

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honing a Mosin chamber

Postby rjmt » Sun Oct 29, 2017 9:21 am

while test various ammo in my Mosin project rifle, I found that brass ammo was sticky to eject, but lacquer coated cases were not.
used a Flex Hone 800 grit .308 chamber hone for about 5 min.

https://www.brownells.com/gunsmith-tool ... od651.aspx

I've used Flex Hone on small motors, but didn't know they made a series for firearms.

WORKS GREAT - all ammo now eject smoothly

also improved the cycling of my Finn M39

now, only 11 more Mosins to hone

RJMT
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Re: honing a Mosin chamber

Postby Grindl » Sun Oct 29, 2017 6:05 pm

Great idea for fixing a real problem . Like most guys that try to shoot "F"-Open ; loads tend to be on the high side , and I run into the sticking problem along my third string . 45-55 rounds within a hour or so . Barrel heats up . Even using a barrel fan so this will help .

Which of the Hones did you use for this fix ? I'm guessing the .45 cal but rather hear it from the source . :thumbup:
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Re: honing a Mosin chamber

Postby rjmt » Sun Oct 29, 2017 6:43 pm

I used the 800 grit .308 hone
worked just fine
be sure to order the Flex hone oil also

I did look at the .45 hone, but it is straight walled for cylinder chambers
the .308 hone was tapered properly to reach all the way in
ran it back and forth for about a minute each, out, relube and do it again
about 5 min total
I used a .45 mop to clean out the chamber afterwards

your a REAL man if you can put 45 rnds down your Mosin in an hour
even with a padded shooting jacket, 20 a day is good with me
also, since I was shooting for accuracy, I let the rifle cool a minute between shots - I'm aware of the barrel heating issue
I let the steel buttplate ride up on my collor bone once with the 200 gn heavy load and felt it for days

this solved my problem - good luck with your issue

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Re: honing a Mosin chamber

Postby Grimstod » Thu Nov 02, 2017 5:06 pm

You guys are FL sizing with .002 of shoulder bump right??
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Re: honing a Mosin chamber

Postby Grindl » Thu Nov 02, 2017 8:11 pm

Absolutely , Grim . It's still in the high 80's , low 90's out here and by the time we finish up at 600 , then move back to 1,000 , the barrel is a bit toasty . No issues thru 3 strings at 600 , but by the time I get to around 40-45 rounds at a Grand , ( slightly bigger load ) I'm getting some occasional sticking cases .
We "poured" the chamber , and the casting says it is .0025 undersized just below the rim . When I read rjmt's post about the hone , it was like , " cool . That'll fix that ".


To rjmt : My rifle is a purpose-built Target rifle for shooting F-class , Open Division . It weighs 18 lbs. and is equipped with a shoulder re-coil system . Check out the posting , "Odyssey in "F" Class . There are pictures . Az. State Championships begin this weekend so it was my last practice day . Shot 60 rounds at 600 , and got 40 down-range at 1,000 before we ran out of time , and mirage started getting really ugly . I'm a skinny little dude , too . And I built this rifle as a "shooter" , knowing how many rounds I'd have to fire . :thumbup:
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Re: honing a Mosin chamber

Postby rjmt » Fri Nov 03, 2017 5:07 pm

Grindl, your shooting way out of this old man's class
I just play with Mil Surp rifles and factory ammo out on my Property
this old body can only take so many steel butt plate recoils in a day. I only have a 100 yd range on my property, need to get to a formal range to build up a chart for this PE reproduction scope with the Brown Bear and LVE ammo.

some day an archeologist will perform a dig on my property and try to figure out what massive battle was fought here.

that's why I moved to a mountain top in Washington state, so I can shoot my Mil Surp rifles in my front yard!!

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Re: honing a Mosin chamber

Postby rjmt » Sun Nov 19, 2017 5:23 pm

working on this Mosin M38 project - she's always cycled Brown Bear just fine, but was sticky on any brass cased ammo

honed the rifle for my standard 6 min with the hone - fired 5 rnds of PPU brass case - still sticky to eject - not slam the bolt handle with a 2x4, but more resistance than Brown Bear

honed it for 3 more cycles of 3 min each - cleaned the chamber between hone cycles

FINEST KIND - cycles like my PEM sniper with all ammo now

nothing but good words for this Flex Hone!!

Brown Bear is not giving me any support, but their 174 gn FMJ is turning out to be my ammo of choice for Russian Mosins - just purchased another 500 rnd case

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Re: honing a Mosin chamber

Postby Marauder 1 » Mon Nov 27, 2017 10:16 am

you guys have a link for this? I'll add it to the links page.
Thanks
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Re: honing a Mosin chamber

Postby Grindl » Mon Nov 27, 2017 11:45 am

Yes , Mark . rjmt posted it in the first post , at the beginning , but I'll list it again here .

https://www.brownells.com/gunsmith-tool...od651.aspx

Still waiting to receive mine as I just ordered it a few days ago , and I'll also do a follow-up on the results when available in a couple of weeks . Very encouraged by rjmt's results , though .
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