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M75 action screw torque
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May 2, 2024 - 2:51 pm
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Hello all. I searched the WWW and couldn’t find torque value for the action screw on my M75 T so I figured I could get that info here among the guru’s! Has anyone experimented with varying action screw torque on a model 75? There was an interesting post with pics on RFC where a guy did this on a different rifle and found a sweet spot and his groups really tightened up. I thought it’d be interesting to try this and the barrel band to “tune” it. Any insight would be appreciated.

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May 2, 2024 - 4:00 pm
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I can’t speak specifically to the M75, and ‘optimal’ torque for bedding screws. But based on my experience with competition rifles from many years ago, I’ll suggest that there likely is no single ‘one size fits all’ torque, and you’ll need to play with differing settings to optimize accuracy. 

 

There are just too many variables at play, such as moisture in the wood, points of contact between barrel and stock, etc.  I’ll further suggest that you may find that different ammo may offer a bigger difference than bedding torque.

 

In any case, a M75 with a decent barrel should deliver excellent accuracy.

Good shooting!

Nevada Paul

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May 2, 2024 - 4:24 pm
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Hi Paul, thank you for the reply. I guess my biggest concern is the max recommended torque. That’s the number I’m looking for, I don’t want to exceed that. I’m going to remove the action from the stock to generally deep clean & inspect, and fiddle with the trigger adjustment.

I found the post I mentioned on RFC really interesting. As this fellow changed the action torque there was a distinct point where the groups shrank then opened up again beyond that. I thought it would be interesting to try, plus it gives me a good reason to go to the range! My thoughts are, I have two points of tuning to play around with (action screw and barrel band) so why not? If I achieve anything of note or if it turns out to be nothing at all, I’ll report back.

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May 2, 2024 - 4:31 pm
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Maybe you need to identify the screw size and grade if possible.  Max torque most likely is based upon these numbers.  If your accuracy is effected by the torque value it is because the components are flexing. 

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May 2, 2024 - 6:12 pm
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As this fellow changed the action torque there was a distinct point where the groups shrank then opened up again beyond that. ShawnN said  

I’d take that with a grain of salt.  As Paul said, major accuracy variable with all RFs is ammo–that’s the first question to settle, & it will take some time to sort out.  When these guns were still used in competition, I think few shooters tampered with the bedding beyond making sure the front rcvr screw was tight, unless maybe the gun was a real lemon that wouldn’t shoot at all.

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May 2, 2024 - 9:13 pm
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Still working to determine optimum torque for my 75 but I know “sloppy loose” doesn’t work. I carelessly left it and the forward band loose after a thorough cleaning and on the next range trip I was quite puzzled by the sudden loss of accuracy. Snugging them up at the bench restored the accuracy I am accustomed to. The action screw is a fair bit tighter than the forward band but I didn’t measure the torque.

 

Mike

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May 3, 2024 - 3:32 pm
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TXGunNut said
Still working to determine optimum torque for my 75 but I know “sloppy loose” doesn’t work. I carelessly left it and the forward band loose after a thorough cleaning and on the next range trip I was quite puzzled by the sudden loss of accuracy. Snugging them up at the bench restored the accuracy I am accustomed to. The action screw is a fair bit tighter than the forward band but I didn’t measure the torque.

 

Mike

  

Do you know the specified torque or upper limit?

I had never really believed the torque setting would make much difference even after reading multiple, multiple times at RFC where guys claim they tweak their accuracy with action torque – then I saw pictures to support it so I just figured why not try it? Not to mention, the folks at Winchester designed, tested and put into production an adjustable barrel-tensioning device that’s a fairly complex system, on a second-tier platform – which leads me to believe they likely found it made some difference. Unless they were just messing with Remington and Anschutz… So, if barrel tension changes things, it’s an easy leap for me to consider action torque as a variable. And,,,since I love shooting this gun and need more practice anyway, I’m going to do it! It would just be real handy to know what the factory specified torque setting is, or a recommendation of what more experienced gun guys torque theirs to.

Thanks everyone!

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May 3, 2024 - 4:01 pm
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Shawn, you may not want to hear or read what I am going to write, but here goes anyway.  I was told by a gun smith who makes rifles for bench rest shooters (centerfire ones) as well as competes on his own about “torquing” bedding screws.  His rifles use action screws with allen head slots, so use an allen head wrench.  He advocates using the short end of the wrench in your dominant hand to tighten the front action screw as tightly as you can with thumb and forefinger on the short leg of the wrench.  Then just snug the rear screw.  He eliminates any intermediate screws from the action (say in back of the magazine well).  He does not advocate playing with differing torque settings nor even using a torque wrench (and I DO have one).  But he is not talking the model of rimfire rifle you wish to experiment with.  I suspect your rifle will have slotted screws and you won’t have an allen wrench to try to use the short leg only to tighten.  You will be using several screws as well, so you may just wish to blow this off entirely.  But I would not get overly ham handed trying to reach higher torques.  A well fitting screwdriver is important!  Tim

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May 3, 2024 - 10:35 pm
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tim tomlinson said
Shawn, you may not want to hear or read what I am going to write, but here goes anyway.  I was told by a gun smith who makes rifles for bench rest shooters (centerfire ones) as well as competes on his own about “torquing” bedding screws.  His rifles use action screws with allen head slots, so use an allen head wrench.  He advocates using the short end of the wrench in your dominant hand to tighten the front action screw as tightly as you can with thumb and forefinger on the short leg of the wrench.  Then just snug the rear screw.  He eliminates any intermediate screws from the action (say in back of the magazine well).  He does not advocate playing with differing torque settings nor even using a torque wrench (and I DO have one).  But he is not talking the model of rimfire rifle you wish to experiment with.  I suspect your rifle will have slotted screws and you won’t have an allen wrench to try to use the short leg only to tighten.  You will be using several screws as well, so you may just wish to blow this off entirely.  But I would not get overly ham handed trying to reach higher torques.  A well fitting screwdriver is important!  Tim

  

Thank you for the info. I never mind hearing advice, especially from an expert. I have a gunsmith driver set, I always make sure I use the correct size. 

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