August 17, 2024 – The ExhaustNotes Blog

By Joe Berk

I’ve joked around a bit about my 1940 Tula Mosin-Nagant’s bore by writing that it looks like a sewer pipe. It turns out my description was closer than I realized. I recently purchased a Teslong borescope (watch for an upcoming review here on ExNotes), and I took a look at what things looked like inside the Mosin. Wow, was I ever shocked. That photo above is my Mosin, from the inside.

My Tula Mosin and a 100-yard target shot with my reloaded ammo. The first five shots are at the bottom of the orange bullseye. As the barrel heated, the subsequent shots hit higher.

I shoot only jacketed bullets in the Mosin described above, and even with that funky bore it shoots them well. This rifle is surprisingly accurate. That’s amazing, particularly in light of the fact that the bore (while clean) is extremely pitted, and in some places, I couldn’t even see the rifling. Still, it cuts a relatively tight group at 100 yards, especially considering that I shoot it only with its native iron sights. On a good day, it will put five shots into a little over an inch before the barrel heats up, and then when it does heat up, it walks them up a line no wider than an inch due to the stock deflecting the barrel upwards.

The Izzy Mosin at the West End Gun Club. I shoot cast bullets in this rifle.

A 7.62x54R cartridge loaded with a cast bullet.

The above Mosin’s bore, as seen through the Teslong borescope. It is in much better shape than the rifle I use for shooting jacketed bullets.

I have another Mosin (a hex receiver 1935 Izhevsk) I use for cast bullets, and I thought it had a pristine barrel. I was wrong about that, too. The Teslong reveals all. It’s way better than the Tula’s bore, but it also bears more than a passing resemblance to a lunar landscape. But it, too, can cut a decent group at 100 yards. What makes that amazing (at least to me) is that it does so with the same old prehistoric iron sights and cast bullets.

A 100-yard target shot with cast bullets. This rifle had been zeroed for 50 yards, which is why the shots are below the bullseye.

When these rifles were new back in the 1930s and 1940s, primers were corrosive, and corrode the bore they did. And obviously the soldiers who carried them did little to clean them adequately. I’m not faulting them; those troops had other things on their minds and I’m just making an observation. I’ve been driving myself nuts using the new borescope when I clean my modern rifles trying to get every speck of copper and carbon out of the bore, and I’ve been living in anguish every time I see a machining defect or scratch in these firearms. As the Mosins show, I’ve been worrying for nothing. A bore that is in pretty rough condition can still be accurate.

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