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Started By
Message
re: Mosin-Nagant Yesterday. Looking for comments
Posted on 4/18/14 at 2:54 pm to TideCPA
Posted on 4/18/14 at 2:54 pm to TideCPA
quote:OK, the "bullet test" is a new one on me. (had to look it up)
Have you tried the bullet test to see if there's any crown erosion? A lot of these were counter bored for a reason.
I'm out of 7.62x54R ammo, so I tried 7.62x39 round. The crimp is about a millimeter above the bore.
I see where you're going with this...makes the most sense of anything yet why the groups would tighten up so much after barrel gets warmed up.
1
Posted on 4/18/14 at 2:57 pm to doublecutter
first of all any Mosin you buy has been refurbished and it is rare to find an all numbers matching, the bolt, receiver etc we all marked after the fact
two there is cosmoline everywhere, did you look at the spent casings? were the primers hit square and with good pressure?
was it surplus ammo? Crap in bolt could be keeping the firing pin from operating correctly thus resulting in poor primer strikes and bad accuracy. Was there any unburned powder left in the barrel?
did you take apart the bolt assembly and clean?
my guess is as above shooting the gun allowed whatever to settle or clean out. Also how does the crown of the barrel look, these all were redone but just asking.
two there is cosmoline everywhere, did you look at the spent casings? were the primers hit square and with good pressure?
was it surplus ammo? Crap in bolt could be keeping the firing pin from operating correctly thus resulting in poor primer strikes and bad accuracy. Was there any unburned powder left in the barrel?
did you take apart the bolt assembly and clean?
my guess is as above shooting the gun allowed whatever to settle or clean out. Also how does the crown of the barrel look, these all were redone but just asking.
This post was edited on 4/18/14 at 3:00 pm
Posted on 4/18/14 at 3:14 pm to CoastieGM
quote:
OK, the "bullet test" is a new one on me. (had to look it up) I'm out of 7.62x54R ammo, so I tried 7.62x39 round. The crimp is about a millimeter above the bore. I see where you're going with this...makes the most sense of anything yet why the groups would tighten up so much after barrel gets warmed up.
That might be it. There were mostly peasants handling these rifles and many of them weren't very careful with the cleaning rod. This is the reason many of the arsenal refurb rifles had the bore drilled out about an inch to essentially create a new crown.
Posted on 4/18/14 at 3:15 pm to ninthward
quote:Heck, ask away. I appreciate the time and knowledge.
but just asking.
quote:Mine has all matching numbers which is why I got it. I had no idea the parts were marked after the fact.
it is rare to find an all numbers matching, the bolt, receiver etc we all marked after the fact
quote:I took that thing down to every single little piece and cleaned it to military inspection level, i.e. REALLY fricking clean to the smallest detail.
there is cosmoline everywhere,...Crap in bolt could be keeping the firing pin from operating correctly thus resulting in poor primer strikes and bad accuracy...did you take apart the bolt assembly and clean
quote:No, dammit!
did you look at the spent casings? were the primers hit square and with good pressure?
quote:Nope. I used modern non-corrsive ammo. Barrel looked good afterward.
Was there any unburned powder left in the barrel?
quote:I don't know what to look for. TideCPA recommended a "bullet test". I used a 7.62x39 round and about 1 or 2 mm of the crimp was above the muzzle.
Also how does the crown of the barrel look
Posted on 4/18/14 at 3:24 pm to CoastieGM
Posted on 4/18/14 at 3:35 pm to TideCPA
Posted on 4/18/14 at 3:52 pm to TideCPA
Wow...great links. Thanks. 
I think we may have hit on an answer.
That thing has been counterbored. The riflings look to be in excellent condition, but the bullet falls way in.
Apparently when cold (40 deg), not getting enough bite into the bullet. After14 rounds fired, I guess there was enough expansion to increase the bite and thus improve accuracy.
Sound like sound logic or bullshite?
I think we may have hit on an answer. That thing has been counterbored. The riflings look to be in excellent condition, but the bullet falls way in.
Apparently when cold (40 deg), not getting enough bite into the bullet. After14 rounds fired, I guess there was enough expansion to increase the bite and thus improve accuracy.
Sound like sound logic or bullshite?
Posted on 4/18/14 at 4:07 pm to CoastieGM
I've seen a lot of reports of accuracy decreasing when the barrel heats up so it stands to reason that it could work the other way around.
Next time you just need to have someone else fire the first few rounds so you can be the one with the better group.
Next time you just need to have someone else fire the first few rounds so you can be the one with the better group.
Posted on 4/18/14 at 4:21 pm to TideCPA
quote:Translation....my thought process is full of bullshite! (hey, I'm ok with that)
I've seen a lot of reports of accuracy decreasing when the barrel heats up so it stands to reason that it could work the other way around.
quote:
you just need to have someone else fire the first few rounds so you can be the one with the better group.
Sound advice. 
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