.308 bullets in a .3095 barrel

Kegcaissy

Kegcaissy

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Hi!

Looking for some info on jacketed bullets choice. I got that finnish mosin that slugs .3095", can i use .308" bullets in this one? Would .310" jacketed bullets be a better choice? I know that he will shoot .311" cast bullets with ease but how about jacketed ones?


Thank you
 
Try a box of flat base 180 gr 308 bullets.

Start low and work up, with groups of 3, in 0.5 gr increments. Accuracy should improve as the loads get hotter.

Report back on how it works out, so we all learn.
 
I've used .308 bullets in my No4MkI and have not found any problems. It shoots around 3 - 4MOA using the existing iron sights. Just try it, you may be surprised how well they shoot.
 
It's completely your call on this but if you can find an adequate supply of .311 diameter bullets in the weight range you want to shoot, IMHO go for it. The Finns shot a lot of captured Russian ammo through their rifles and even though it's listed as having .311 bullets I've got some with .312 bullets.

When following regular loading manuals and you have any concerns about pressures drop the load by 2-3 grains and all should be within spec. The slight diameter difference won't make much if any difference. Who knows, the slightly larger diameter may even shoot better although I've never noticed it make any difference at all.

For full disclosure, I regularly shoot .312 diameter bullets out of my Mosins. That doesn't mean you should though. Especially if you're uncomfortable with it.

I have an old NEW Finn capture Mosin with a crisp .312 diameter bore and it shoots anything from .308 to .312 of the same weight into the same POI at 100yds.
 
I had a 1943 Remington 03-A3 military 30-06 with a very worn bore, the throat was .311, mid bore was .309 and at the muzzle it was .312. The bullet that shot the best was the "flat base" Hornady 170 grain flat point designed for the 30-30. The 30-30 bullets had a softer lead core and filled the bore when fired and kicked in the seat of the pants.

I like Ganderite's post above using a "flat base" 180 grain bullet, longer bullets have more surface area to grip the rifling and more likely to shoot good groups. And a boat tail bullet will likely not fill the bore and not shoot as well as a flat base bullet.

As stated above flat base bullets will expand more and fill the larger diameter bore and a boat tail bullet will not. The Hornady manual lists its bullets in the front part of the manual and lists the optimal velocity range. The bullets listed with a lower velocity range will have thinner jackets and softer lead cores and fill the bore better when fired.

Good luck, and let us know how you make out.
 
Hi!

thank you for your comments, i'll begin with hornady Interlock RN 220gr (who happens to be flat based) and H414 (because this is what i have on hands right now...) I will post the results that i will get on paper when temperature will be on my side, it's -28c right now.
 
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