Go - No Go

[4xforfun]

I am going to try and switch my 6.5 WSSM tube from one BAT "M" 8.5 to another twin action. I do not have any go-nogo gauges. I know some people stick layers of scotch tape on the casehead to check for excessive headspace....if I remember corectly the figure was .001 per layer of tape.

Is this number (.001) correct per layer?

When is headspace considered "a little to much" and also "dangerous" ?


My guess is .000 - .003 would be good, .004 - .005 A little to much, and .006 + in the "Dangerous" catigory.

 

[jo191145]

Take 4 layers of your tape. Stickem together and measure. Divide by 4 of course.

Ya know, if you have twin actions this might be a good time to have a smith cut the longest down to match the shortest. In the future any barrel cut for one would be interchangable with the other. No fuss, no muss.

I would use virgin brass. Your old stuff has already undergone that initial stretch, hardened up and likely not willing to undergo it again without failure.

While virgin brass can stretch quite a bit on its first firing I always go for damn tight headspace. ;D

I don't have a Bat. Assuming its a standard 90 degree shoulder you should be able to measure your two actions while the barrels are off. Face of action to boltface.
Whatever the difference is is what the difference in headspace should be. Do enough comparitive measuring and you should'nt need the tape. Can't hurt to double check but good measurments are better than sticky tape. Good Luck.

 

[Larryh128]

I just miced a piece of Scotch brand at .002. Cheaper stuff is thinner. Right or wrong, I set my chambers up to JUST close on a go gauge & not close with a single piece of scotch tape on the guage. If it's scotch brand about 3 pieces is probably as far as you want to go. Measuring 4 at a time is indeed a better guage as thickness can & does vary. See how many pieces it takes to hold the bolt (stripped) up & go from there.

 

[Rookie]

Why not just spend a few bucks for a set of gages?

 

[Larryh128]

I always buy a go guage but I've never owned a No Go, If I'm over more than .001, I'm setting it back. And it's a good idea especially on switch barrel rifles to own one even it you don't do your own work.

 

[alf]

Tod,

Take a piece of fired brass, unsized, from the first barrel, knock the primer out, and see if it chambers. If the bolt, w/o the firing pin assembly, chambers fine, add tape to the ass end until the bolt gets snug, and measure base to shoulder to find out the difference between the two. I'd try this with a couple to confirm. I concur with the zero to about three thou being ok, cause you bump a couple anyway. Much more, I'd anneal, neck up one diameter, and back down for a false shoulder, and shoot 'em.

 

[4xforfun]

Why not just spend a few bucks for a set of gages?

If I order today, will I get it today?

You see how well I plan ahead.... ;D ....I am shooting sunday am.

 

[Rookie]

Why not just spend a few bucks for a set of gages?

If I order today, will I get it today?

You see how well I plan ahead.... ;D ....I am shooting sunday am.

If you blow a case and have to go to the ER today will you get seen by the Dr. today. :'(