Bolt to raceway clearance, Kauger actions

[AlNyhus]

There's a couple schools of thought on bolt-to-receiver clearance. Receiver material also enters into to this. From my own experience, I know where I like it to be.

 

[jimmymac]

There's a couple schools of thought on bolt-to-receiver clearance. Receiver material also enters into to this. From my own experience, I know where I like it to be.

Want to share?

 

[LVLAaron]

Do they make the actions and bolts in house? Its possible they come from two different places, and each have their own tolerance.

 

[Kevin1990]

Well I asked Kauger again and he said .0025 on the BRii. I'd like to measure but don't know how nor probably have the tools.

My concern is that I've seen posts that say vertical can happen with loose tolerances, but I've never been able to pin point at what point that would happen, or if other factors need to come into play for that to happen.

Kelblys just told me yesterday they run all actions between .002-005 so I imagine they try and hit in the middle as well.

I'd be interested in @AlNyhus thoughts on all this as well.

 

[round]

.0025 total clearance is nothing.

Do you honestly think youll ever be able to tell the difference on the target between a .002 or .005 fit ?

 

[Kevin1990]

.0025 total clearance is nothing.

Do you honestly think youll ever be able to tell the difference on the target between a .002 or .005 fit ?

I Probably wouldn't be able to notice the difference between a .005-.010 clearance. That said, if I think it would help, then I want it. If someone got .006-.007 that's excessive and way outside the stated tolerance. Is it too much for a guy to want accurate info on this or any action for that matter that they are paying well over 1k for?

 

[Rat Rifle]

It’s Perfect

 

[BuffaloBill]

I don’t have measurements but can say the perceived fit and smoothness of my Kauger CRSII bolt is not much different than my Borden Moutaineer RR. Both are very nice IMO.

With the bolt open and about half way rearward, I did a simple feeler gauge check. The gauges I used are the narrow ones KTM sells for checking valve clearances. I was able to slide the .002” between the bolt and receiver, but the .004 would not go. I don’t have a narrow .003 gauge.

 

[Sniperhandle]

.0025 total clearance is nothing.

Do you honestly think youll ever be able to tell the difference on the target between a .002 or .005 fit ?

Vertical is usually bedding or the load, I would say bolt clearance can be a factor, But the other 2 are usually the culprit.

 

[Rick300]

I have a BRII that has .003" to .004" and a BRIII that has .006" to .007"
Jim

If your BRlll has that much clearance then I'm sure Kauger will want to inspect it and make it right. Have you contacted them?

 

[Sniperhandle]

Like Bill said, Use some feeler gauges, If you don't have thin ones, Buy a cheap set and a regular pair of scissors will cut feeler gauges under 0.010 most likely, Under 0.005 for sure.

 

[6BRAckley]

There sure is a lot of "discussion" in this thread premised on one person's measurement of one Kauger action. I have 2, bought a third, and to be honest never measured that part but curiousity now might cause me to. I pay more attention to the measurement of targets.

JP

 

[RiflePainter]

Do they make the actions and bolts in house? Its possible they come from two different places, and each have their own tolerance.

Kauger manufactures everything in house. I primarily use nothing but Kauger on the majority of my customer and personal builds. I have been to their manufacturing facility and can assure you the amount of technology and equipment is second to none. In general, the bolt to raceway clearance on the competition actions is .002"- .004". Im sure if anyone has one they feel is out of spec, a phone call to Adam at Kauger would be the best action and I can assure you he will take care of it. I dont know every action manufacturer personally like I do Kauger, but I will say they are some of the best people and best products out there imo.

 

[Kevin1990]

There sure is a lot of "discussion" in this thread premised on one person's measurement of one Kauger action. I have 2, bought a third, and to be honest never measured that part but curiousity now might cause me to. I pay more attention to the measurement of targets.

JP

I agree, with this. I'd be mighty grateful if you'd measure, plus if anyone came looking at this thread in the future they would have more real-world measurements than one that may not be accurate.

 

[Edd]

With the bolt open and about half way rearward, I did a simple feeler gauge check. The gauges I used are the narrow ones KTM sells for checking valve clearances. I was able to slide the .002” between the bolt and receiver, but the .004 would not go. I don’t have a narrow .003 gauge.

My actions have more clearance when halfway open than they have when closed. Some bolts are intentionally made smaller between the ends.

 

[AlNyhus]

.0025 total clearance is nothing.

Do you honestly think youll ever be able to tell the difference on the target between a .002 or .005 fit ?

In a real deal Benchrest rig....yes. -Al

 

[Kevin1990]

Over the past week, I've dug into about every conceivable thread on here and benchrest central. I've seen this mentioned that it really does matter, but never an explanation as to how or why. I've seen threads with a panda bolt bushed that was .009 down to .004, but again never any real world data or observations from someone in the know.

Want to be clear, I'm not saying that it doesn't matter, but I'm not seeing anything to support it, but I'm just a layman trying to learn.

 

[AlNyhus]

Over the past week, I've dug into about every conceivable thread on here and benchrest central. I've seen this mentioned that it really does matter, but never an explanation as to how or why. I've seen threads with a panda bolt bushed that was .009 down to .004, but again never any real world data or observations from someone in the know.

Want to be clear, I'm not saying that it doesn't matter, but I'm not seeing anything to support it, but I'm just a layman trying to learn.

Kevin, think about what the back end of the bolt does in a receiver with a lot of clearance....it levers up, right? Now think about where that lever point is up front. Now imagine what happens to the top bolt lug as it tips forward from the lug abuttment when the bolt is closed. Now imagine what happens when the trigger is released and the back of the bolt drops. Think about what happens when the top lug slams against the top lug abuttment. Finally, imagine a tuning fork....

 

[LVLAaron]

Kevin, think about what the back end of the bolt does in a receiver with a lot of clearance....it levers up, right? Now think about where that lever point is up front. Now imagine what happens to the top bolt lug as it tips forward from the lug abuttment when the bolt is closed. Now imagine what happens when the trigger is released and the back of the bolt drops. Think about what happens when the top lug slams against the top lug abuttment. Finally, imagine a tuning fork....

The last part (tuning fork) is probably the most important. The idea of a bolt slapping around makes me lose sleep.

 

[Kevin1990]

Kevin, think about what the back end of the bolt does in a receiver with a lot of clearance....it levers up, right? Now think about where that lever point is up front. Now imagine what happens to the top bolt lug as it tips forward from the lug abuttment when the bolt is closed. Now imagine what happens when the trigger is released and the back of the bolt drops. Think about what happens when the top lug slams against the top lug abuttment. Finally, imagine a tuning fork....

Al, you're a gentleman and a scholar! Much appreciated!