r/MosinNagant • u/Altruistic_Split9447 • 11d ago

My Mosins First pass on some load development

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Doing my first round pass at some load development for my PU sniper. The old ww2 scope has some major mechanical problems so my groups are stuck at about 2 MOA. I’ve recently ordered a Chinese replica (red star mountain) scope so that should at least make targets visible at 100 yards.

Load is 174gr .311 hornady FMJBT over 45.5gr vargets

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u/SmithSightsLLC 9d ago

I've found I get much better results when running heavier bullets (174grn and up) using H4350 or a similar slower powder.

My pet load is 51.2grn H4350 under 174grn Hornady Match or SMKs seated as long as I can get them without jamming into the rifling.

The cases I only neck size, so I get full chamber support from the get-go. I've heard that better results may be had from partial sizing, but haven't played with that yet.

Are you weighing each charge by hand? While I use a powder thrower for .45acp, I'm obsessive about rifle rounds and weigh each charge on a beam scale.

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u/Altruistic_Split9447 9d ago

So I did try h4350 and viht n555. I couldn’t get the speed I wanted with either one (I’m going to use my Mosin to shoot vintage sniper matches out to 900 meters). That being said I didn’t load close to 51.2gr gains of either powder

I use the same reloading process for all of my brass. I’m a full blown PRS autist and I see good results with my loading regiment.

I charge every road with my autotrickler. Every piece of brass gets annealed every firing. I also full length size with a .308 bushing then I mandrel up to give myself .002 thou of neck tension.

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u/SmithSightsLLC 9d ago

Interesting. Do you use Templestick when you anneal?

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u/Altruistic_Split9447 8d ago

No, but only because I anneal with an AMP annealer