+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 20

Thread: SVT40- accuracy controls

Click here to increase the font size Click here to reduce the font size
  1. #1
    Really Senior Member Ridolpho's Avatar
    Join Date
    Jan 2012
    Last On
    Today @ 03:03 PM
    Location
    Province of Alberta, Canada
    Age
    61
    Posts
    1,004
    Local Date
    08-24-2019
    Local Time
    01:51 PM

    SVT40- accuracy controls

    I'm curious about the anecdotal stories of accuracy problems including wildly errant first shot so I decided to begin a little accuracy test of my own examples. For starters I thought I'd strip each of the four and attempt to see how the action/ barrel are bedded in these refurbs. The rifles are Tulas (two 41's, one '42, and one '44). Two have the groove at top of the bolt cover and are probable original snipers. All have very well preserved metal surfaces and show signs of quality work in the refurb. To be brief, all four show consistant bedding points as shown on the photo. With the stock installed all four have significant (5 lb+) up-pressure at the tip of the stock. This pressure is either entirely on the ring in the lower metal jacket or, in one rifle, on both metal and about one inch of the wood. I don't believe the metal jacket assembly is rigid enough to impart any up-pressure at its tip but, rather, will flex as the barrel oscillates. The cleaning rod is also "along for the ride". Rearward, the barrel to barrel re-inforce are free while the receiver ring and small flat forward of the cross-pin bear on the stock. Of great interest to me, three of the four display absolutely zero longitudinal free-play of action in stock with cross-pin and trigger assembly inplace. The fourth (a non-sniper) has considerable free-play (at least 0.008") which is what I get the impression some feel could lead to the big spread between first and second shots and which could be solved with shims. To me, the biggest unknown seems to be the effect of all the junk hanging on the front of the barrel (ie. forward of the tip of the stock). These parts are probably highly variable in fit from gun to gun. So, question to the accurizing gurus out there: How well thought out is the position of the stock-end up-pressure from a barrel oscillation point of view and what approaches might be worth considering for optimizing one of these rifles? I plan to take a couple to the range this weekend to start some tests. Love the design- simple, logical.



    Ridolpho
    Attached Thumbnails Click image for larger version

Name:	DSCN0567NEW.jpg‎
Views:	965
Size:	77.7 KB
ID:	46760   Click image for larger version

Name:	DSCN0569NEW.jpg‎
Views:	1094
Size:	81.3 KB
ID:	46761   Click image for larger version

Name:	DSCN0561NEW.jpg‎
Views:	1032
Size:	127.3 KB
ID:	46762   Click image for larger version

Name:	DSCN0562NEW.jpg‎
Views:	1119
Size:	262.0 KB
ID:	46763   Click image for larger version

Name:	DSCN0563NEW.jpg‎
Views:	993
Size:	196.2 KB
ID:	46764   Click image for larger version

Name:	DSCN0564NEW.jpg‎
Views:	897
Size:	203.8 KB
ID:	46765   Click image for larger version

Name:	DSCN0566NEW.jpg‎
Views:	441
Size:	254.7 KB
ID:	46766  

    Click image for larger version

Name:	DSCN0597NEW.jpg‎
Views:	3013
Size:	196.0 KB
ID:	46767  
    Last edited by Ridolpho; 10-24-2013 at 11:44 PM. Reason: typo

  2. The Following 4 Members Say Thank You to Ridolpho For This Useful Post:


  3. # ADS
    Friends and Sponsors
    Join Date
    October 2006
    Location
    Milsurps.Com
    Age
    2010
    Posts
    All Threads
    Banner AD Space Available - Click HERE to Inquire We specialise in military utensils and artefacts such as helmets, daggers, medals and badges, etc.  The on-line store is intended for personal browsing and searching of collecting objects. All items are provided historical value only and can be used for home collection or other purposes except of fascism, Nazism or other extremism manifestation or its propaganda. LIMITED TIME OFFER FROM THE AMERICAN GUNSMITHING INSTITUTE: Get Immediate Online Access To AGI's NEW Armorer's Course for Glock Pistols, Covering Every Generation of Glocks, Including the Latest Model 42/43 and Double Stack Pistols for ONLY $7.00! Brian Dick ... BDL Ltd. - Specializing in British and Commonwealth weapons Chuck in Denver ... Buy-Sell-Trade .. Guns, Cars Motorcycles We pride ourselves on being the new lowest price listing service, and the simplest to use. If you need to buy or sell collectible firearms or any firearm in your legal possession, then this is the place for you. If you’re a big collector clearing house, or other seller that could benefit from a Premium seller account, then we can also support you here at Gunonline.com. Your source for the finest in High Power Competition Gear. Here at T-bones Shipwrighting we specialise in vintage service rifle: re-barrelling, bedding, repairs, modifications and accurizing. We also provide importation services for firearms, parts and weapons, for both private or commercial businesses.
     

  4. #2
    Advisory Panel

    jmoore's Avatar
    Join Date
    Mar 2009
    Last On
    08-15-2019 @ 04:37 AM
    Location
    US of A
    Posts
    7,066
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    You may be a trail blazer on the subject, at least in this hemisphere. I'm down to two and a few spare parts. Both are Finnishicon captures, so no Post-WWII rework. Looking forward to your findings!

  5. Avoid Ads - Become a Contributing Member - Click HERE
  6. #3
    Contributing Member WarPig1976's Avatar
    Join Date
    Jan 2013
    Last On
    Today @ 10:36 AM
    Location
    Delaware county, PA just outside Philadelphia.
    Posts
    2,594
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    Real Name
    Jeff
    Good thread, looking forward to the results..


    The soldier above all others prays for peace, for it is the soldier who must suffer and bear the deepest wounds and scars of war.

    Douglas MacArthur

  7. #4
    Really Senior Member Ridolpho's Avatar
    Join Date
    Jan 2012
    Last On
    Today @ 03:03 PM
    Location
    Province of Alberta, Canada
    Age
    61
    Posts
    1,004
    Local Date
    08-24-2019
    Local Time
    01:51 PM
    Thread Starter
    Thank's guys. I'll be hitting the range tomorrow (Saturday) with a big pile of quality commercial ammo. Sunday we may get our first big snow of the season. I wish there was more written (in english) on the SVT38/40 but all it has received so far seems to be passing (but useful) mention in books about other rifles (for example, in "Hitler's Garands" by Weaver). Has anyone out there any knowledge about books in Russianicon that might exist- I've recently tracked down a Russian language prof. at the local University.

    Ridolpho

  8. #5
    Really Senior Member Ridolpho's Avatar
    Join Date
    Jan 2012
    Last On
    Today @ 03:03 PM
    Location
    Province of Alberta, Canada
    Age
    61
    Posts
    1,004
    Local Date
    08-24-2019
    Local Time
    01:51 PM
    Thread Starter
    jmoore: I forgot to ask- what, if any, repairs or changes did the Finlanders make to your two rifles?

    Ridolpho

  9. #6
    Advisory Panel

    jmoore's Avatar
    Join Date
    Mar 2009
    Last On
    08-15-2019 @ 04:37 AM
    Location
    US of A
    Posts
    7,066
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    They did nothing more than mix some parts and add the SA mark, as far as I can tell. One is matching except for the trigger group, the other may have a few other mismatched parts, but both keep the parts to the same mfg.

  10. Thank You to jmoore For This Useful Post:


  11. #7
    Really Senior Member Ridolpho's Avatar
    Join Date
    Jan 2012
    Last On
    Today @ 03:03 PM
    Location
    Province of Alberta, Canada
    Age
    61
    Posts
    1,004
    Local Date
    08-24-2019
    Local Time
    01:51 PM
    Thread Starter

    Update

    Well, I can see this is going to be a lot tougher than I thought. Made it to the range with two rifles but ended up only shooting one ('42 Tula with sniper notch). This gun has very tight action body fit- no detectable free play but bore is only fair with dark, slightly pitted grooves/ decent rifling overall. The rest of the mechanicals look hardly used post refurb so strange the bore is as it is. Unfortunately the gun was not zeroed (way off) and the equipment I had with me wasn't up to the job of drifting the front leaf. Forced me to hold off to right on the targets I had which, I might say, weren't much good for these open sights. Then I had to play with the gas setting to get it cycling (totally reliable on 1.3). Main fact about this gun is long, heavy trigger pull- one of the worst I've run into. Photos show the two best (aargh) 100m 5 shot groups of the day. The one on the right is about 5 inches, the one on the left has 3 shots in about 1.25 inch and a fourth pulled and a fifth......? It slam-fired after number 4 and probably went well above the target. Went to put the scope on for a few groups only to find I'd misplaced the pin. End of session. The ammo that I used was "WPA" steel-case, 174gr fmj. It's my intention to establish typical groups with all four (well, now it's five) of my SVT's which have a variety of action fit, bore condition, trigger pull, etc. Three of the five will hold a scope and these will be shot both scoped and over the iron sights. Might try a few experiments like shooting without cleaning rod/ metal guards, shimming loose action bodies, etc. I'll revive this thread in a month or two when I've finished. You might want to buy stock in "WPA".

    Ridolpho
    Attached Thumbnails Click image for larger version

Name:	IMG_0947NEW.jpg‎
Views:	411
Size:	147.9 KB
ID:	46824  

  12. #8
    Advisory Panel

    jmoore's Avatar
    Join Date
    Mar 2009
    Last On
    08-15-2019 @ 04:37 AM
    Location
    US of A
    Posts
    7,066
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    I figured out how to lighten the trigger pull, but it requires relocating the spring seat on the sear. It's the strangest firing mechanism! If you go swapping trigger groups, watch that the disconnector pin in the receiver engages properly the safety bent at the front of the pack. Very often it won't work right without fitting.

  13. Thank You to jmoore For This Useful Post:


  14. #9
    Really Senior Member jjjxlr8's Avatar
    Join Date
    Oct 2010
    Last On
    07-07-2019 @ 06:59 PM
    Location
    Ohio
    Posts
    200
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    There are a few slow motion videos of the SVT40 firing that might give you a hint as to what pressure points might be more important..

    I think this is one but I'm unable to view it right now.

  15. The Following 2 Members Say Thank You to jjjxlr8 For This Useful Post:


  16. #10
    Contributing Member WarPig1976's Avatar
    Join Date
    Jan 2013
    Last On
    Today @ 10:36 AM
    Location
    Delaware county, PA just outside Philadelphia.
    Posts
    2,594
    Local Date
    08-24-2019
    Local Time
    03:51 PM
    Real Name
    Jeff
    Quote Originally Posted by jjjxlr8 View Post
    There are a few slow motion videos of the SVT40 firing that might give you a hint as to what pressure points might be more important..

    I think this is one but I'm unable to view it right now.
    Yup, that's the one..

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Similar Threads

  1. MKII lowers, what controls position on upper receiver?
    By c310pilot in forum The Bren LMG (Light Machine Gun)
    Replies: 2
    Last Post: 09-18-2013, 11:18 AM
  2. Commercial controls corporation
    By Rustship in forum M1/M2 Carbine
    Replies: 7
    Last Post: 01-16-2012, 09:31 PM
  3. Tokarev SVT40
    By Jason60chev in forum Soviet Bloc Rifles
    Replies: 7
    Last Post: 12-28-2011, 03:57 AM
  4. Commercial Controls
    By jls77 in forum M1/M2 Carbine
    Replies: 11
    Last Post: 10-02-2010, 03:47 PM
  5. ammo for svt40
    By finnigan74 in forum Soviet Bloc Rifles
    Replies: 4
    Last Post: 01-09-2010, 02:31 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts