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SVT Gas Setting Study !

1392 Views 9 Replies 7 Participants Last post by  bananas
I thought this might be a interesting thread to start.Some SVTs run with lower gas settings than others.Maybe if we list some facts about our rifles we can get a idea as to why that is.I will list the facts of my rifle and lets all add ours and go from there.One important fact to note will be the muzzle test.This can be done with out taking the flash suppressor off the rifle.Just pull a bullet from a 7.62x54r shell.Use the red sealer line on the bullet which is common on surplus ammo that we use as your reference mark.Also note barrel fluteing is important SVT rifles have 3 different types.Early is just the case neck fluted.I will call mid war The neck fluted and slightly down the case shoulder.Late war the neck is fluted and down the shoulder and case sides.Now this is my subject rifle facts

1941 Tula SA marked

Barrel bore = Excellent strong shiny bore lightly frosted grooves

muzzle test= Excellent lots of bullet sticking out

Barrel fluteing= excellent early type (just the case neck is fluted)

Recoil spring condition= New

Gas piston and Cyl= New stainless replacements

Gas setting= 1.7 and runs perfect with no excess recoil noted

Chamber condition= serveral scratches from broken case removal at some point in its history.I have polished the chamber completely with emery cloth

Ammo Russian surplus steel case light ball

Spent case condition= good flute marks noted. Cases do tend to crack at the shoulder and slightly down case side.Case edge were ejector grabs on shows no problems of excess force. Note i have also had a few crack in two original refurbed PU snipers i have.A Rguns and a Sammco.

Ejection distance= right around 5 or 6 ft

If anyone thinks of anything else just add it Thanks !
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Just took mine out shooting yesterday. Everything you have listed is the same except for:

1942 Tula refurb. (1941 with a 2 stamped over the 1)

Recoil spring: Looked new when I bought it 5-6 years ago.

Gas piston and cylinder: original refurb

Gas setting: 1.5

Ammo: Bulgarian LB 1952

I also have an occational failure to extract. This is solved with a good chamber/flute cleaning. I am also OCD with pipe cleaners to the gas system ports. That gas system gets clogged, the whole weapon suffers. This is true with AK's, Ar's, SKS's...whatever. Carbon buildup is not your friend when it comes to firearms.
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No splits or cracks that I remember. I removed the obvious bad cases from the 1200 rounds I bought. All dated 1952-53. The cases are brass. Flute marks only on the neck. Ejection distance? I would say they hit the deck at ~5ft. and then travel from there.

By the way. The failure to extract showed the pressure point to be at the base after extraction. I also had one blown primer yesterday. I have yet to try different ammo. I has taken me about 3-4 years to go through the 1200 rounds. I still have about 200 left. The cases are not the greatest. Most are just fine. The ammo itself is consistant in all my rifles. I need to buy more soon. I'll stay away from the Bulgarian in my semi-auto. It all works just fine in my bolt actions. Pretty dirty stuff too. BUT, my Mosin Nagant chew it up like candy.
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