Barrel strength question.


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Numeric
February 9, 2012, 12:25 AM
I have just removed the sight bands on my M1916 Spanish Mauser in 7x57. First of all, there are 2 holes under the rear sight band. The one that held the rear sight set screw, and there is a second hole 90 Degrees clockwise (from receiver end) and 2 3/8" from the chamber barrel step. I am concerned that these holes may cause the barrel to fail now that there is no barrel band around them.

The set screw hole is 3/32" (.0937") deep, and the other hole is 1/16" (.0625") deep. The barrel is 3/4" in diameter at this point, and I've calculated that the barrel walls are .233" thick. Therefore, the hole doesn't go more than halfway through the barrel wall. But that's still just a little over 1/8" of steel to hold in a tremendous amount of pressure. Could that sight base band really have been holding the whole works together all these years?

I don't roll my own cartridges (yet); I use factory Remington, S&B, PPU etc. that are supposedly loaded to safe pressures for older rifles.

What I want to know is: are my concerns about barrel strength justified? Should I take it to a gunsmith for an inspection, or am I being too cautious since it obviously hasn't blown up in probably 70 years of use.

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dfariswheel
February 9, 2012, 01:18 AM
There shouldn't be a problem.
No barrel band is going to prevent a blow out if one is going to happen.
Mauser rifles typically have holes drilled for sights to interlock with and those aren't that deep.

MachIVshooter
February 9, 2012, 01:22 AM
Just about any rifle that has/had open sights has holes in the barrel.

Not to worry.

briansmithwins
February 9, 2012, 01:56 AM
That hole was always there since the rifle left the factory. The fact it had a screw in it didn't make the barrel any stronger.

Rifle barrels can be thinned down a whole lot more than most people think. Check Hatcher's Notebook for a experiment he did.

BSW

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