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View Full Version : 5.45x39 bolt face question...


dcompton
06-30-2012, 11:01 PM
Anyone know if a .378 bolt head has enough tolerance variance to accept a 5.45x39 case without opening her up? Any input would be appreciated.

DC
Gmac5
07-01-2012, 08:07 AM
Nope it will not fit .5.45x39 is the same as 762x39 and6ppcwhich is min 440 for case + at least .005 to .008 for the bolt face . I hope this makes sense as i have not had my coffee yet
Gary
nsaqam
07-01-2012, 09:46 AM
Nope it will not fit .5.45x39 is the same as 762x39 and6ppcwhich is min 440 for case + at least .005 to .008 for the bolt face . I hope this makes sense as i have not had my coffee yet
Gary

Nope that is wrong Gmac. The 5.45x39 has a rim diameter of .394".
I'd say it's close enough to give it a try at least. .016" probably won't fit but you never know.
nsaqam
07-01-2012, 09:49 AM
I do know the .480" 6.5x55 rim works in unaltered .473" boltheads but that's only .007".
Stockrex
07-01-2012, 11:08 AM
I tried could not get 5.45x39 fit in my 204 bolt face (.384)
I guess you could open up the face a bit.
nsaqam
07-01-2012, 11:39 AM
Good info Stockrex.

I kinda doubted that the boltface would accommodate a .016" larger rim.
dcompton
07-01-2012, 10:50 PM
Thanks guys.....sigh....to the lathe then. Anyone know, is that what CMPArmory is doing for 5.45 bolt heads? Don't know why, but I'm just needing to build one. Jeesh now I'm going to have two Savage builds going on.

DC
outlawsix
07-02-2012, 12:51 AM
Well i just fit a 5.45x39 case in my 223 case head. So im sure the variances are out there. Just a matter of if yours is closer in spec than mine is and apparently yours is. My bolt head has an ID of .396 so compared to what it is suppose to be...its pretty sloppy
dcompton
07-02-2012, 01:07 PM
Nice to know...just have to see what mine looks like when it gets here.
Gmac5
07-02-2012, 01:57 PM
Sorry for the screw up i have always mixed up 220 russian for the military 5.45 x39 . Good thing i measure twice and cut once
Sorrygary
devildogandboy
07-02-2012, 02:20 PM
yep, i just checked the dia on two of my bolt head-.384 and .388
nsaqam
07-02-2012, 03:21 PM
Well i just fit a 5.45x39 case in my 223 case head. So im sure the variances are out there. Just a matter of if yours is closer in spec than mine is and apparently yours is. My bolt head has an ID of .396 so compared to what it is suppose to be...its pretty sloppy

Even though it fits .002" is not nearly enough clearance for surefire functioning IMO.