Gunsmithing Reducing bolt over travel ???

[Shawd43]

There is a bit of over travel in my bolt when cocking. It seems like there are a few options such as changing out firing pin springs, but I wanted to see if anyone out there had any personal experience with this before I try a few different things.

Surgeon 591sa

Thanks guys

 

[Greg Langelius *]

First, be certain you don't need that overtravel. Most of it is probably there to allow one to extract and eject a loaded round, which can get somewhat lengthy when seating long to reach for the lands better.

Look/ask around about whether this is a problem with others you shoot with. It isn't for me, and in going on 20 years on this site, this is the first time I've come up against this question.

Greg

 

[ShtrRdy]

I guess I was wondering in which direction is the overtravel?

 

[DAVETOOLEY]

I'm not sure what you mean by overtravel on cocking. Cock on closing or the firing pin moves forward on closing? There several critical dimensions. The location of the trigger in the action, sear engagement location on the top lever of the trigger, location of the contact patch on the cocking piece on the firing pin. Then there is the amount of rearward travel of the firing pin that is required to allow the trigger to reset without pulling the bolt to the rear and there is the required amount of firing pin travel when fired. Many moving parts and none have anything to do with the firing pin spring.

 

[Shawd43]

Thanks for the comments guys, I will explain a little further, I don’t think what I meant was properly conveyed through text.

So I was going through the rifle and just noticed a l have quite a bit of “slop” when I lift the bolt knob. Meaning after firing, the rear of the bolt will shift enough to allow me to lift the knob a half of an inch before it starts to reset. It seems as if there needs to be a bit of a thicker sleeve on the bolt. I can see where the original sleeve is but it’s still fairly loose. The excessive movement when running the bolt had me look into additional options with shortening either firing pin travel or bolt travel. Just some ideas, I’ve never dealt with this before that’s why I tossed this out for ideas, figured maybe someone had a similar concern.

 

[DAVETOOLEY]

What you have is the distance/rotation required for the cocking piece nose on the firing pin to engage the angled cam area on the bolt. Which then retracts the firing pin to the cocked position upon full rotation of the bolt. Nothing you can do about that.

 

[natdscott]

Listen to Dave.

Dave knows things.

 

[Shawd43]

Yah know this may be more difficult to explain than I imagined. I am familiar with operations cycle of the action and bolt, I am not a gunsmith or a self proclaimed expert in any, just saying I understand what’s happening and it seems excessive. However this is my first surgeon action, the shroud just has more movement than a defiance or Bat. I may just need to post a video, and in all reality I understand this just may be the play that’s needed to keep it as smooth as it it, and it is smooth. Again I appreciate the info gentlemen, I will try and get a video up today.

 

[ShtrRdy]

If it works don't worry about it. Sounds like a slight difference in cocking piece to cam dimension is setting off your "slop" detector.

 

[gunsnjeeps]

Not that I've shot that price range of rifle but if you get rid of the lift before cocking wouldn't your firing pin strike the camming surface on firing?

 

[Shawd43]

If it works don't worry about it. Sounds like a slight difference in cocking piece to cam dimension is setting off your "slop" detector.

Yah, and for the most part I’ve just been ignoring it. Running the bolt during matches is where I notice it the most, I have to stabilize the chassis with my thumb because the pressure from resetting the firing pin is interrupted, (nothing at first, then full weight) and strong enough to disturb sight picture. Well either way I’m running it a couple times a week regardless.