Agree with the other posts about safety first when working on guns.
Re penetration, military ammunition has been tested over and over for penetration among other things. During the 1920s the US Army was small and some guys in army ordinance had time to do a lot of testing. Refer to the book "Hatcher's Notebook." The 30-06 was the army cartridge then and there shouldn't be much difference between it and a 270 as far as penetration goes. To sum it up, ball ammunition, not armor piercing, will penetrate 1/2 inch of mild steel at close range. Armor piercing bullets will penetrate 1/2 inch of armor plate which is high carbon steel. An armor piercing bullet merely has a small tapered cylinder of hard steel in it.
Penetration depends on velocity, bullet construction, and weight of the bullet. If the 270 had a 130 grain bullet it was probably traveling about 3100 feet per second. For comparison a 22 long rifle goes about 1200 fps. The 30-30 goes about 22 or 2300 fps. The army 30-06 was supposed to go about 2900 fps with the 150 grain bullet.
Your friend was very lucky.
KEH
PS, I hope I didn't double post this with my clumsy fingers.
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