Author Topic: Action Screws  (Read 2090 times)

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Offline Terry V

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Action Screws
« on: December 31, 2023, 08:54:22 AM »
I am new to the group so please bear with me, as this question probably been asked before. 
I have a CZ 457 Varmint MTR and am looking for the MIN-MAX torque settings for the two action screws, also which do I tighten first, the forward screw or the back screw?
Thanks

Offline Fasteddie01

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Re: Action Screws
« Reply #1 on: January 02, 2024, 09:54:32 AM »
Well, on my V-MTR I have both screws at 20-inch pounds, though 5-10 i-pounds more might be 'correct' for your rifle?  As for "MAX", since the rifle has 'poly pillars' I wouldn't go over 35-40, but that may cause too much flex on the receiver.  And the pillars showed 'impressions' on my rifle when I got it.  I can't 'correctly use my Wheeler 'manual' Fat Wrench to check torque when 'un-screwing' so I don't know what it was set at, but it was 'pretty tight'.  I had to 'shave' off wood with a sharp chisel around the pillars to 'set free' the receiver there.
As for tightening sequence, I first 'snug' BOTH screws with the receiver pulled 'back' into the recoil lug.  I then tighten the Rear screw next to 20 i-#, then the Front.  I don't know if the actual F-R sequence matters.  Maybe someone can provide 'Real Info' to that ??
BTW,  I (and many others) have found SK/Lapua ammo to be most accurate in my rifle.  It seems the MTR Chamber is very compatible with those 'flavours'.  Eley does well, but Not AS well.  Other brands are a matter of LUCK.