Get your own Teslong Rifle borescope here: amzn.to/3XmK3Is

I learned a lot today. Thanks.

Pacific Tool & Gauge makes custom barrel counter bore tool bits. No need to set up a jig. The muzzle rifling in many WWII Eastern Front Mosin and Mauser rifles were eroded by muzzles being exposed to the elements as well as steel cleaning rods being used without a muzzle protector. Usually the lands are damaged about an inch or so down the barrel. The gases escaping unevenly in this area throws the bullet in odd directions. Counter-boring was a common fix by Germany and the Soviets during WWII when every rifle was needed. Counter-boring not only creates crisp grooves and lands at the end of the counter-bore section but also concentrically evens out the section of smooth bore at the end of the barrel so the gas escapes evenly around the projectile as it exits. Counter-bored rifles can be as accurate as a non counter-bored rifle if performed correctly.

Superbly informative stuff man, Ioved seeing the bore camera view too

I'm an East Tennessee hillbilly. I understood what you said with ease.

Never enough education. Thank You Sir.

Loved and enjoyed all of it and learned something too.

Good info Deuce!!

I have a 1898 dated 1891mosin with finnish stock and FA stamp. it's counter bored. shoots well. my first mosin purchased through sportsman's guide many years ago. shipped right to my door since it's an antique.

I had a short Mosen counterbored when I got it , it shot well , quite accurate .

I’m Western NC Hillbilly I got it! I’ve had Mosins for 25 years and NEVER knew that was a bore protector!! Thanks

Muzzles on old rifles (pre-non-corrosive primers) are often eroded (more) at each end of a barrel. To improve (not cure) the accuracy problem, counter-boring the muzzle and running a bore reamer past the chamber can help. My old .30 Gov't. Krag-Jorgensen needed a replacement barrel from primer/powder erosion. I found one dirt-cheap (used) and so it was worth it to me.

Great video thanks for sharing

Counterboring had its place. Between corrosive ammo and aggressive cleaning with metal cleaning rods (those little guide caps were easily lost) the rifling at the muzzle gets really torn up. Nowadays, the smartest thing for any Mosin owner to do is just use a boresnake from the breech end. I'll also add a tip: don't use bore foam on pitted barrels! Pitting in a bore can, over time, be partially filled in with fouling that is not removed with a normal cleaning routine due to patches and brushes simply not going that deep. People who have deep-cleaned their pitted barrels have sometimes reported loss of accuracy. The best way to clean these barrels is with conventional methods.

Thank you for the education.

Thank you for the lesson

Hey from Australia. My boys looked over my shoulder and were stoked to see all those Mosins. I only have Enfields here hah

3:45 $30??!!….I hate you 😂

Nice work.

So there's actually a chance I can get a functional Mosin for under a bill? Neat.

Most don't remember soap and water in a brush for corrosive ammunition. Works. Then dry the bore with patches and oil squeezed. It works.

Interesting information

Man, those barrels looked like the surface of the moon through that borescope.

You had me messed up 😂 at the beginning

Thanks for the video deuce i have an old 9130 i bought years ago and it has a counterbore barrel, i was kinda upset when i first saw it then i did some research and saw the counterbore comment its a Finnish capture it has the metal sling swivels took me a while to figure that one out too thanks for the video👍

I had a counterbored Mosin 91/30 that was very accurate. It was counterbored about 2 1/2”

Good video

Interesting video and JUST WHAT I WAS LOOKING FOR!!!! A few years ago I acquired a old interesting commercial Mauser made by a gunsmithing guild associated with Krupp, it had a BEAUTIFULLY MACHINED BARREL!! The barrel was octagon shape where it screwed into the receiver then about a third of the way down the barrel it was round. It had a raised rib that ran the whole length of the barrel, it was MACHINED that way with express rear sight was dovetailed to the barrel and the front sight was a small continuous raise of the barrel rib with it slotted for interchangeable front sight posts. The bolt was of the spoon or butter knife handle style bolt handle with a little engraving on it as well as all over the rifle, the engraving was subtle. It has gold plated twin set triggers. There are serial numbers on most of the larger parts: barrel, receiver, bolt, gas shield, magazine well and the trigger assembly and they ALL MATCH. What makes it MORE SPECIAL it's in 7mm Mauser and proof marking date it PREWWII (crown over N). It's a NEAT rifle but someone screwed up the first inch or so inside the end of the barrel. It made me think that someone used the end of the barrel to POKE the dangerous animal he just shot and cleaned the outside of the barrel and NOT INSIDE, CLEANED at a much later date allowing TERRIBLE RUST TO SET IN. I had heard about the COUNTERBORING but not much about it!!! Do you think it should work for ME and my problem?!!! I hope so it would be SHAME to let all this TLC and OLD WORLD CRAFTSMANSHIP go to WASTE.!!!😮😢

I read an article in Polish firearms magazine, that in garrisons Mosins had been cleaned all at once, one after another, while being placed in a vice and always from the front. Of course, soldiers in the field cleaned their rifles individually. Claening rods ware just bare steel, so crown damage occured quite often. Meanwhile Mauser rifles had only a section of cleaning rod attached. Three of these had been screwed together to clean a rifle's bore, two sections for a carbine. That was enough at garrisons, but in the field it was huge pain it the a**. To counter this issue, Germans issued their soldiers individual cleaning kits with "bore snakes" - aluminium lined piece of chain, that looked quite like rosary beads. Probably this is why Mauser rifles ware counter bored much less often, and especially captured ones, that ware picked up without it's cleaning kit. Soldiers had them stored in separate belt pouch.

I bought two m44 at the retaliative same time. On counter bored, one not. Sold the Counter bored one. Both in good shape from a visual. But think I did the right thing.

Both my M44 and M91/30 have next to perfect bores and crowns, neither apparently never saw much use. I know there are counter bored versions out there, but I've personally never seen one.

I have an old Chinesearmy surplus FN Mauser that has been counterbored half the barrel length.

Nice MN91/30 sniper on the wall. Was that pointer a 182gr AP Heavy ball?

Thy deuce. Where did you find those orange plastic holder.

I bought an M38 from a gun store about five years ago that nobody bought it because they thought the barrel was worn out and it was counter bored.

Her: "It's my first time" Also her: 2:20

When it comes to muzzle testing rifles, I have learned long ago not to trust that result solely. I have a Savage Sporter in 25-20. The rifle shoots 1 inch groups at 75 yards, but the muzzle eats the bullet. Same with my Savage 340, same with my Marlin Camp Carbine

I owned a counter- bored Mosin rifle. It shot fine, it was just unnerving to look at the end of the barrel.

It isn't just Mosens that were counter bored, it was common practice with most adults surplus. I personally go with the theory that it's an attempt to counter damage caused by the metal cleaning rods included with the rifles.

Actually informative where I was afraid the whole barrel was counter bored.

What we call coning on a muzzle loader, does away with the need for a short starter. They sell tools to cone the muzzle loader by hand

Bought my Mosin's years ago and have never checked for that. Without going to the safe I know I have both lengths of that rifle. Questions With accuracy aside are they safe to shoot ? Will a new crown on the muzzle fix this issue ? How many rounds will it take to do more damage than already there ?

Why didn't they just recrown the rifles? Is the counterboring done to make sort of a recessed target crown? If so, why not have this type of crown to start with?

Does a properly counter bored rifle still shoot well ?

Almost seems like counter bored would be better than even a recessed crown for protecting it

my father used a string with a patch tied in the middle

This certainly would be the cheapest way for a quick fix.. Is there not a process of chrome electroplating the bore then resurfacing or re-rifling the inside?? I would think that most crown damage would be from corrosive ammo and the end of that barrel cooling the fastest and drawing moisture to it so corrosion of the metal starts there first..

The crown was damaged once in a while by impact but the thing that damaged the end of the rifling the most was cleaning with a steel rod that wore away the first inch and a half to 2 inches of rifling.

Is there any spare new unused barrel to have it rebarreled

They’d be more likely to use a reamer with a well fitted pilot to do this. The end-mill is unlikely to do this accurately. Probably much of the damage is caused by cleaning rods.

Weird. Seems like on the arsenal refurbs itd be cheaper n quicker to recrown vrs counter.

The most damaging thing too the mosys was there were issued a rough string With a brush screwed on the end. Pulling this was like a saw it bit into the crown ! On one side caueing uneven gases. Making the bullet fly off target If done right it realy does work never saw a mauser done maybe captured I have sen french mas if you want a nice gun. Take the butt plate off the stock serial number is penciled on it and the butt cap. Is all your numbers macth you probally bought a great gun

It's cheaper to counterbore a barrel than to replace it. And considering how many Mosins the USSR made, it only makes sense, especially during a war.

Evaporust the barrel.

The muzzle isn't the first part of the barrel to wear out, the throat is. If the muzzle is worn to the point that a bullet will slide in easily, that weapon is way past useless and I would question the action and bolt face.

30 buck.... God bless.

Man we need to buy you a chalkboard. Lol. Wouldnt the notch in a muzzle as a bullet exits cause it to become destabilized in flight, asking for a friend. Not really, asking for myself truthfully. Now I'm going to have to go check my mossie, as I don't know if its counterbored or not, but its a pie plate shooter @ 100 yds, so not the best. But it has extremely clean rifleing in the bore, but I pull the bolt an clean it from the rear anyway with aftermarket rod an cleaning supplys. Thx for the vid an the knowledge. P.S. It was our standby deer rifle at camp, good enough for camp meat tho.

I guess I missed the part as to WHY the weapon is counter bored in the first place?????

Just love the way you and the commenters oog and aah over these junk Mosins. For what they sale for you can (and should) buy American. I just purchased a Remington 700 low serial # at the gun show for $325.00 with a Red field scope that will out shoot these Mosin junkers. Do you realize importers pay around $3.00 each for Mosins and about 15.00 each import tax? What a markup!!!! But to each his own.

I understood and iam not even American

Couldn't they just recrown it?

В России есть переточенные винтовки Мосина в 410 калибр!!!

Why is he pronouncing it Mohz-ni? The "n" is on the end. Mow-zeen. If you are including the Nagant part, the "t" is siilent. Nuh-gahn.