Near accidental miss calibre size before potential sale 8mm

philhut

philhut

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May have averted an unfortunate accident, listed a mauser (one with the sight hood) on EE and had two interested buyers this morning chomping at it. Decided to hold off and do more research on it. He lt it side by side with my other K98 and noticed this below.


I do not have an ddnn accurate barrel calibre Guage. Is the smaller appearing barrel diameter perhaps .308 or 7mm? Or is my other rifle rebored?



Shaking at the thought I could have sold someone a rifle telling them it was the wrong calibre. Yes I know they should check too but yikes

s
 
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It's a VZ-24, they were made in many calibres. What are the markings on the chamber?

EDIT: Never mind, looked at your other post, it's just a VZ-24 sight protector. Oddball rifle - suspect its an 8mm, is your other one counterbored?
 
There were (and still are) VZ24's that were rebarreled to .308 available from several dealers. Not sure how they are marked?
 
This is a K98 or was a K98 everything of significance that would help has been "buffed" off in the postwar process. Materials used tell me it is late war, stock has a 45 and a 3 or 4 digit number below it on the underside of the stock. Nothing at all on the rifle to suggest the bore size. Heading to Canadian tire out of curiosity.

If it's not 8mm then I sure hope it's .308 over something obscure
Now for the novice how big are the bore diameters of
8x57JS mauser
.308 (7.62x51)
7mm
Etc..
 
philhut said:
This is a K98 or was a K98 everything of significance that would help has been "buffed" off in the postwar process. Materials used tell me it is late war, stock has a 45 and a 3 or 4 digit number below it on the underside of the stock. Nothing at all on the rifle to suggest the bore size. Heading to Canadian tire out of curiosity.

If it's not 8mm then I sure hope it's .308 over something obscure
Now for the novice how big are the bore diameters of
8x57JS mauser
.308 (7.62x51)
7mm
Etc..
Click to expand...

Groove diameters (that is, the distance from bottom of groove to it's opposite across the bore) - is same nominal size as the bullet diameter - therefore 8x57JS is .323"; 7.62x51 is .308"; 7x57 is .284"; 6.5x55 is .264, etc. Note - it is very difficult to accurately measure the bore diameter of an odd numbered rifled barrel (such as 5 groove 303 British). Bore diameter refers to the size of the hole drilled through the barrel and is the distance from top of rifling across to it's partner across the bore - .300" for 30-06 or 308 Winchester. Easy enough to google the exact numbers for various cartridges...
 
If you have any ammo or bullets, seat them into the muzzles to start getting an idea. You'll know your bullet diameters, so if it drops down the bore, or the case mouth contacts your muzzle you'll know the bore's land to land diameter is over that bullet diameter. If the bullet will almost go down the bore but stops slightly short then you're in the right neighbourhood, since a bullet should not fit down its corresponding bore due to the rifling. If it stops far short, then your bore is significantly smaller. It's not a precise test, but it gets you easily and quickly started.
 
Wierd they measure the same.... actually the one with the sigh hood is exactly 7.98mm where the one without the sight hood is 8.01mm both withing 8mm standard variance. Optical illusion maybe

(1945)Sight hood rifle measures 7.98mm
(1944)Non Sight hood measures 8.01mm

difference per year of war 0.03mm of rifling? the human eye is pretty perceptive at differences but wow small differences.

This is with my Mastercraft CanTire Caliper tool (On Sale now for $21 for those interested)

I have snap caps in all my rifle calibres, learned for instance on my SKS when opening the magazine with the safety switch in the "fire" position that I can potentially Discharge a round. Its good to Q&A your Rifle before you put live ammunition in it for sure. Safety First Everyone, even if it means delaying or losing a sale deal. If they get hurt using your former rifle guilt could be the least of your worries.
 
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none, they buffed off everything so measurements are the only way to confirm the calibre. Taking it to the range tomorrow will find out if i measured correctly or If I get to use pull and get seen faster in the ER after the rifle blows up.
 
Oh man...always remotely (set up in an old tire or tie to a tree, pull trigger with 50 ft string) fire a gun if ANYTHING is an unknown in the setup...no need for the "hospital bed" to be part of the equation then.
 
philhut said:
none, they buffed off everything so measurements are the only way to confirm the calibre. Taking it to the range tomorrow will find out if i measured correctly or If I get to use pull and get seen faster in the ER after the rifle blows up.
Click to expand...

Get some snap caps in 8mm. If they chamber/feed in both rifles, then they are more than likely both 8mm. If the bore is smaller on one, then the 8mm shouldn't fit the chamber properly.
 
Potashminer said:
Note - it is very difficult to accurately measure the bore diameter of an odd numbered rifled barrel (such as 5 groove 303 British).
Click to expand...
You could measure the outside diameter of the muzzle at different places to get an average, measure the barrel thickness from groove to outside of muzzle and do the math to figure groove diameter. Of course you should measure all the grooves and average readings to compensate for an off center drilled barrel. This will not be as accurate as slugging the bore but should be close. Even slugging the bore with an odd number groove rifling has it's own challenges.

270 totheend
 
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