Just how strong is a Schmidt Rubin 1911?

"other than that, it sized up very nicely"

Laugh2

Pretty impressive how far the shoulder pushed forward and puffed out. For those that have them, how does the 1911 handle escaped gasses? From the little I have read I thought the weakness of the 1911 action was the unsupported case head, not the action itself. Is that not correct?


Mark
 
The GP11 rounds are 174gr at +2600fps, so I suspect that there wasn't that much extra "pressure" due to the .308 rounds. Of course the big difference is in the case, but again, you get that kind of shoulder angle and position movement when fireforming AI rounds. I don't think this was a testament to the strength as much as it was to the control of escaped gases.
 
What is the difference in the bullet diameter? A .308 is 7.62mm isn't it? And a K11 takes a 7.5mm the OP said in the vid. I wonder what the pressure was behind that .308 bullet?

Interesting...not good, but interesting.
 
AdrianM said:
What is the difference in the bullet diameter? A .308 is 7.62mm isn't it? And a K11 takes a 7.5mm the OP said in the vid. I wonder what the pressure was behind that .308 bullet?

Interesting...not good, but interesting.
Click to expand...

The bullet diameter is the same in a .308 and 7.5mm, 7.62 is more like a .303 Brit size wise. I'm not really too shocked that the gun didn't blow up now that I've thought about it. Pressure would probably be less in a commercial 308 round vs. a berdan primed milspec round. The guy who shot the gun is lucky that he doesn't have powder burns on his face! Nice to know that a k11 will deflect gases from a case failure away from the shooter if the need arises.

I think if it was a double charged round and it held together that would be more of a testament to the strength of action.
 
AdrianM said:
What is the difference in the bullet diameter? A .308 is 7.62mm isn't it? And a K11 takes a 7.5mm the OP said in the vid. I wonder what the pressure was behind that .308 bullet?

Interesting...not good, but interesting.
Click to expand...


GP11 bullets measures .3075 at the widest part, which is right at the junction of the bullet sides and the boat tail.
It has sides that taper from .306" in front of the cannelure to .3075" at the boat tail.

.308" bullets fit just fine.
BTW .308" is actually 7.82mm diameter.
the 7.62 really refers to the bore of the rifle, about .300±"
The added depth of lthe rifling cut into the bore makes it out to .308" not to let the gas blow by the bullet.

mm mm/inch Inch
7.5 25.4 0.295275591
7.51 25.4 0.295669291 *tight/new bore for a K31
7.52 25.4 0.296062992
7.53 25.4 0.296456693
7.54 25.4 0.296850394
7.55 25.4 0.297244094
7.56 25.4 0.297637795
7.57 25.4 0.298031496 *considered close to shot out in a K31
7.58 25.4 0.298425197
7.59 25.4 0.298818898
7.6 25.4 0.299212598
7.7 25.4 0.303149606

Notice the 7.7mm, as in Arisaka =.303" bore that uses .312" bullets.
Same as .303 British.
 
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