MFS, 7.62x54r

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Boulevard

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I have been 'accurizing' a 1940 Mosin which used to shoot horribly but now shoots 2-2 1/2" groups at 100 yds. I have also been trying different brands/weight of ammo and I am now convinced that the ammo is the last remaining problem. The best ammo so far is the 203g, MFS, SP but finding data on this stuff seems almost impossible and so my question is;

Does anyone know the Ballistic Coefficient or the muzzle velocity of the 203g, MFS brand, SP?
 
Advertised muzzle velocity is rarely actual muzzle velocity. You'd be best off buying a chronograph and finding out what it's actually doing in your rifle.
 
I don't know, but kudos for you for trying to find out how to make your rifle shoot.

Commercial ammo is generally better quality bullets than milsurp. If you are getting around 2", that is pretty good. My sniper with handloads does not do any better.
 
If you mean did it shoot high the first time I tried it? No, it did not, it shot everywhere. First time out I could barely put 2 shots of a 5 shot string into a 2' target at 100 yards (that's 2 FOOT target, not 2 inch). Another shot hit my sons target which was 4'(FEET) to the right and the other 2 shots went god knows where. Since then I have whittled it down to a 2 1/2 inch group depending on the ammo and for this gun that ammo is the 203g MFS. My problem is will the MFS give me good results box after box or should I just re-load. I really do not want to get into re-loading.
 
Thanks, glad I'm not the only one. I've got yet another Mosin to test out so I'll see how that one fairs. Only shooting surplus though so I get what I deserve I suppose lol.
 
EL34/6L6;

Surplus is just as good as 99% of the so-called 'high quality' commercial garbage. PPU bullet sizes range from .306 to .314, how consistent is that. PRVI is the same and so is everyone else's so called 'good stuff'. I'd say that 90% of the ammo that I have measured had .307" bullets in it. Even the MFS that I like is #### except in this 1 particular weight.

I have put a lot of time, effort and research into my Mosin and I listened to a lot of opinion and I and confident when I say that the #1 problem with the Mosin is the bullets. Solve that first and then test fire your gun.
 
I find it to be a toss up between MFS and LVE for 204gr soft points. Some of my Mosins like MFS, and others shoot better with LVE.

I also reload, but the performance of the above mentioned rounds is pretty good, as well as consistent. The last batch of 500 rounds was about 60 cents per shot, which is less than my cost of reloading with preferred components.

Most Mosins will slug out different than the next. The chore is much easier comparing ammo if you only have one or two rifles.
 
Boulevard said:
PPU bullet sizes range from .306 to .314, how consistent is that. PRVI is the same and so is everyone else's so called 'good stuff'. I'd say that 90% of the ammo that I have measured had .307" bullets in it. Even the MFS that I like is #### except in this 1 particular weight.
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Are you measuring the portion of the bullet outside the case or are you pulling bullets and measuring the shank inside the neck of the case? Some manufacturers make only the base of the bullet full diameter and make the section above the cannalure more of a bore-ride design rather than going for true rifling engagement. Some .308 bullets only measure .308" below the cannalure and can measure .300" to .306" above the cannalure. If you aren't measuring the section of the bullet inside the neck you could get some really wonky results.
 
I measure at the neck but where you measure, to me, is irrelevant. Consistency is what is relevant and it really does not matter where you measure so long as you measure in the same location every time....consistently. I have 100's of .303 British and they are consistently .311 at the neck. I have dozens of 7.62x54 and they measure all over the place....wildly inconsistent, just my bullet placements or grouping. Consistency is also a measure of quality so from this I have concluded that the real problem with the Mosin rifle is the quality of the ammo.

My Mosin has a bore of .312 and it keyholed everything but the 1 box of 150g PRVI and the 1 box of 203g MFS.
 
Boulevard said:
My Mosin has a bore of .312 and it keyholed everything but the 1 box of 150g PRVI and the 1 box of 203g MFS.
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Keeping things simple, I would say those are the rounds not to use in that Mosin. Problem is that the next Mosin might like them.


My last batch of MFS and LVE were 500 rounds each. Everything is consistent though I didn't measure every round in every box. I've heard the the 180gr MFS are all over the map, but this is the first I've heard of the 203gr having the same issue with inconsistency.
 
Thought you meant different boxes/weights/types of bullets from the same manufacturer where all different. If there are wildly different measurements from the same box/lot that isn't a good sign.
 
Measurement from .306 to .314 in same box and duplicated in every box that I have measured. I do have an update though;

I was at the range today and I met a guy who said that he was measuring the exact same caliber of bullet and getting the exact same results as I was and he said the exact same thing that I have been saying...how the heck can you shoot straight with bullets that are all different sizes. While I was at the range I also managed to fire 40 rounds of MFS, 203g, SP and I get unusual but consistent results. My rifle will draw a very straight, 2" horizontal line. I think it is the scope and I say this because it seems to need about 5 rounds after an adjustment just to settle down and I recall other people saying that Bushnell scopes are hard to adjust. Mine is an Elite so its not junk but I agree that adjusting it is a pain in the butt. My rifle now shoots very straight 2" lines 2" high at 100yds. I consider this one heck of an achievement considering this very same set-up could barely put 2 holes in a 2'(foot) target on a 5 shot string.
 
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