BMG Help

[DrEvil]

HI, so this question sounds very self explanatory but I am hoping that there is something i am missing.

I just got a new 50 BMG rifle; it is a high end brand, which I will leave nameless for now as i haven't called the MFG yet. I'm not trying to trash talk just looking for information before i call them.

My question: I got a set of go/no go gauges to check the head space... The go gauge goes in fine and the bolt goes to full lock, so far so good... CONCERN: The NO GO gauge also goes in fine and completely locks...

Is there any possible justifiable reason that this can happen?

(I checked the gauges on another .50 of same brand and the no go does not allow the bolt to lock)

Thanks!

 

[stefan73]

Re: BMG Help

M2?

If so, detail your headspace and timing procedure.

 

[DrEvil]

Re: BMG Help

Nope, single shot bolt action rifle.
thanks,

 

[stefan73]

Re: BMG Help

What go/no go guages?
I think we need a little more info. I would suggest contacting the manufacturer.

 

[rideHPD]

Re: BMG Help

Do you have a field space gauge? Not trying to be cynical/snarky, but I'm curious what prompted you to check the headspace on a well-known factory-manufactured rifle? It's a very smart idea, just a little uncanny if you don't have the gauges lying around, which aren't really cheap. Hope everything works out.

 

[DrEvil]

Re: BMG Help

The gauges are 50 BMG from Brownells, I have checked them on 3 different .50's now and they work as they should... only in my gun will the no go allow the bolt to lock. I don’t have a field space gauge, great advice i will get one.

As for why i checked the headspace to begin with:
1. I’m anal like that.
2. I had some very slight signs of over pressure on the spent cases.(elongated 1 Thousandth in length, my other 50's are only .5 thou longer typically max ) circumferential expansion is within normal limits on the gun.
3. I was having a (very) difficult time extracting some spent cases; like to the point I had to use a cleaning rod down the barrel. (Being Extremely careful of course)i elaborate below.

Some ammo just needed a lot of force on the bolt to extract by hand (US made such as LC), others (foreign made) would not extract at all without taking extreme measures as mentioned above...

I plan on calling the MFG on monday i just want to be prepared for whatever answers i get, and not sound like an idiot

I’m wondering if there is any acceptable reason that a NO Go gauge will “go”.
Thanks for all the feed back and i apologise some of the information i have provided is vague.

 

[stefan73]

Re: BMG Help

Sorry I wasn't any help. Good luck!!

 

[Captain Kirk]

Re: BMG Help

NO GO should not go, not good. It would be interesting to see how far off it is, try placing a piece of scotch tape on the back of the NO GO and see if you feel resistance.

Kirk R

 

[DrEvil]

Re: BMG Help

2 identical rifles...

rifle 1 is the "problem rifle"
rifle 2 is the "good rifle"

With no go gauge in the barrel of rifle 1 it sticks out .233
No go in rifle 2 sticks out .248

so .015 thou of varience between the 2 rifles


good suggestion to "shim" the back of the no go and see how much it takes to keep the bolt from locking. I'll do that tomorrow!