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Discussion Starter #1 (Edited)
Anyone ever use Win760 for this cartridge? Trying to help out a new hanloader having problems. Not a good choice (?) or can it be workable? He is using Hornady 174gr. .311 on top. I have no experience with the 7.62 Russian myself and can find no data for that powder in my manuals.
Thanks for any help.
 

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All I can tell you is that it looks good in QuickLOAD at near full pressure. About 29% ballistic efficiency in a 24" tube. The Hornady manual, which lists 760 loads for the 174 grain bullets they make, gives 42.1 to start and 52.3 grains maximum, but for their heavier 178-180 grain bullets they give 42.3 to start and 53.2 maximum. Maybe because they are .308" instead of .311" or .312"? Anyway, that's a 20% range from start to maximum, which is pretty big. The low end loads are a bit light for good case fill. QuickLOAD puts 46.2 grains to get 80% fill.

I've got some old Sierra data for .308" diameter bullets that gives 46.9 grains to start and 54.1 grains maximum. That starting load seems more reasonable. I would stick with the Hornady 52.3 grain maximum until you learn how the gun does with it?
 

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Discussion Starter #3
Thanks for the info unclenick. I will pass it on to him.
 

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i use 4350 at 54gr with barnes tsx .311. great load for me around 2950 to 3000fps.its one heck of a cat killer,if ya want some good quality accessories check out www.rocksolidind.com.its where i get my stuff when i built mine.be vary warey of thems bolt handle scope mount kits as they are junk.i hope i can get around good enuff to go cat hunting later this year with mine
 

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The lack of decent published loads is a problem alright. For a time, I did have a strain gauge instrumented Finn, and collected some data from it. Remember, each rifle is different and military rifles are sometimes especially different from each other. So all this may be completely different in your friend's rifle. My rifle had a 27" barrel, and data were taken with .310 to .311 bullets.

CCI200 primer, Lapua brass, 51 grains Varget, Hornady 123 grain bullet, 2.770" COL, 44.8 KPSI at 85 degree ambient, 3047 FPS. Suggest not going above this.

Czech silvertip surplus, 149 grain bullet, 46.2 KPSI, 2735 FPS.

CCI200 primer, Lapua brass, 50 grains Varget, Speer 150 grain bullet, 2.880" COL, 49.8 KPSI at 85 degrees ambient, 2842 FPS.

S&B commercial 180 grain, 2601 FPS, 58.2 KPSI. Too hot for my tastes. Pulled the bullets and reused the brass.

CCI200 primer. S&B brass, 57 grains H4831 (the old stuff), 174 grain FMJBT, 2.900" COL, 51.6 KPSI at 80 F ambient, 2553 FPS. Really hard to get that much powder under the bullet.

CCI200 primer, S&B brass, 53 grains H4350, 180 grain Sierra bullet, 3.000" COL, 51.0 KPSI at 80 F ambient, 2645 FPS. AA4350 gives nearly identical results.


Hope that helps.
 

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Lazydog - your link is still a lousy one. Couldn't be found on the internet.
 

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Well they have a very interesting K-31 Schmidt-Rubin mounting setup. Little spendy (cost more than I paid for the rifle) but from there video link seems to work without jamming problems.

There Mosin-Nagant mount is spin off of the ATI mount which I use but throw other junk in recycle bin sans the drill and tap. Bright spot is they make hex mount for older style hex receivers.
 
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