1934 m27

[fintowin]

The F and D are only throat indicators according to what I have read. Having said that, it is never a bad idea to slug barrels on any military weapon built in this era. Bore diameters vary greatly from one rifle to the next. Just look at the venerable Swedish Mauser. They measured the bore on each rifle and stamped it on a stock disk.

[Judi and her Mosins]

Very nice indeed,.... then I wonder why I find myself looking at Finn's more....Judi and her Mosin's

[bunkysdad]

I need some of that tea. I would think that if a chamber throat is designated for a .308" bullet then so would be the bore. I am sure that a difference of .003" or three-thousandths inch would not cause a catastrophic dilemma, but would increase chamber pressure and excess bore wear? Don't know with certainty, but anyway it has always been said that it is wise to slug the bore on Finns. I bought a special package of lead sinkers at least a year ago for such a task, and there they sit still waiting for me to get off my dead a$$!

[fintowin]

I have never seen anything written that spoke of the F or D denoting 308 diameter. Throat or leade is what is being denoted by these letters. A somewhat arbitrary measurement of "3 lines" I believe was the "target" diameter originally. The tooling of the day did not allow consistency, so a little big was better. Someone correct me if im way off base.

[desdem12]

Without looking I think it is a .309 bore on these. The letter is a throat marking and not a bore mark. The finns were playing around with the throat to squeeze accuracy out of their rifles.

[fintowin]

If thats true, then a 308 bullet will be ok for accuracy. I think I will slug this one. It may be a candidate for cast only. I think a 311 cast bullet will work nice. I had good luck with with cast in my m39 be4 I sold it like an idiot.

[rvgunner]

I think zeebill is pretty much right on with his thinking, tea or not. Per 7.62x54r net, the bore of all models of Russian mosins is .310. Finn bores .3095, except M39 .310, m28/30 .3082. I have an M27 F marked, meaning a slightly shorter chamber dimension, 7.62x53r, most are D marked, meaning the rifle will shoot the D heavy round as well as the Russian 7.62x54r round. My rifle is not D marked. I think that most rifles were reamed out to accept the 7.62x54r round, but some were not marked because of war or were done in the field. I have not shot my M27 yet, but since most were used in battle a lot and are not new bores, if the round chambers and the bolt closes easily you should be good to go. Even if it were a M27 with a brand new bore and you are shooting the normal .310 Russian surplus, the difference is less than 3 thousands. I have no doubt my M27 will shoot well, if you have doubts do a chamber casting to measure the chamber but the bore should be ok.

[bunkysdad]

I have been trying to wrap my head around this throat thing. I found the info, but it just isn't written as easy to understand as I wish it was. Anyway, speaking of the M27 model, the difference in the F and newer D was a tighter chamber in the F marked barrel, but what does that mean? Why can it be addressed by hand loading? Well before the F mark was a trials barrel marked A but that is only important to help understand the differences, since the A marked chamber doesn't exist as far as any in known collections is concerned. So the difference being in the angle of the shoulder of the cartridge. When the new D166 cartride was developed the longer spitzer bullet just didn't fit the tighter chamber, and slightly tighter bore. Handloading allows one to build ammo that fits, and the use of whatever bullet is determined to be correct, after doing a bore slug.
*** The biggest reason I have not been able to "get it in my head" is because I am still waiting to acquire my first M27, or M28. It could be years, or it could be this weekend. I can't tell you how many times I have acquired a rifle that the week before I had no idea was out there.

[zeebill]

Yepper you never know what rifle is a head of you!

Just discovered something today while I was freighten around in the M27 collection. My newest M27 is a VKT numbered 0109 and dated 1932 and wonder of wonders it is F stamped. I checked the head space and pin protrusion but I have not chambered any ammo with it yet. Wonder what is in store for me there now? Great something else to wonder about! I lose sleep over the mundane and worry not about what I should worry about these days! Bill

[bb91]

Interesting placement of the cocentric circles stamp on your M27, just from my observations it's usually directly over the rear sling slot.

Nice M27, but then I'm partial to them! It's an Army thing.

[Darryl]

M27...My favorite Mosin. That is a really nice looking one too! Congratulations!

Dolk