.40 S&W Deep Throat

[fltbed]

I thought that 1911's depended on the forward end of the case encountering the reduced radius in the barrel and resulting in the proper headspacing of the rear of the cartridge properly wrt the "firewall" surface that surrounds the firing pin.  So wouldn't the shorter case slide too far into the chamber, and produce an excessive gap between the rear of the case and the "firewall" surface of the slide?

That is the theory however, I recall articles written in the late 1970's detailing how in autoloading pistol calibers like the 45 acp and 9mm Luger, the cases grow shorter the more times you reload them and that they actually headspace on the extractor.

That is why almost every 10mm autoloading pistol can shoot the shorter 40 S&W in a pinch. 
However, what we're talking about here is using a 40 S&W chambered barrel and 40 ammo seated out to 10mm length.

[sqlbullet]

That is the theory however, I recall articles written in the late 1970's detailing how in autoloading pistol calibers like the 45 acp and 9mm Luger, the cases grow shorter the more times you reload them and that they actually headspace on the extractor.

That is why almost every 10mm autoloading pistol can shoot the shorter 40 S&W in a pinch. 

There are a few guns that don't have the extractor strength to counter a firing pin that can reach far into the chamber.  In those cases you can see some ugly brass come out:

http://www.thegunzone.com/10v40.html

Clearly lots of guys shot 40 in their 10mm pistols.  I personally do not.  I see the cost of a 40 barrel to be cheap insurance if I wanna shoot 40 ammo.

And, as fltbed says, this thread is about using a 40 barrel and throating it for long loaded ammo.

[Olgo]

What's your next project? S&W Does Dallas? 

[my_old_glock]

What's your next project? S&W Does Dallas? 

I though about calling it the 40 Lovelace


.

[Ten2six]

I got to try some of the 40 S&W deep throats loaded with 165 gr. Everglades jhp's and 9.3 gr. of Power pistol. Shot through my Bar-Sto 40 S&W barrel in my Delta Elite. Seated to 1.245 functioned the best and produced 1320 fps ave. I like this set up!

[gandog56]

That is the theory however, I recall articles written in the late 1970's detailing how in autoloading pistol calibers like the 45 acp and 9mm Luger, the cases grow shorter the more times you reload them and that they actually headspace on the extractor.

That is why almost every 10mm autoloading pistol can shoot the shorter 40 S&W in a pinch. 

There are a few guns that don't have the extractor strength to counter a firing pin that can reach far into the chamber.  In those cases you can see some ugly brass come out:

http://www.thegunzone.com/10v40.html

Clearly lots of guys shot 40 in their 10mm pistols.  I personally do not.  I see the cost of a 40 barrel to be cheap insurance if I wanna shoot 40 ammo.

And, as fltbed says, this thread is about using a 40 barrel and throating it for long loaded ammo.

Hmmm, me too. I shoot .40 cal in my .40 cal. (Of course my .40 cal also has a barrel for 357 SIG, but that's different)

[my_old_glock]

I got to try some of the 40 S&W deep throats loaded with 165 gr. Everglades jhp's and 9.3 gr. of Power pistol. Shot through my Bar-Sto 40 S&W barrel in my Delta Elite. Seated to 1.245 functioned the best and produced 1320 fps ave. I like this set-up!

Yup, cheap range brass.

How was your accuracy?


.

[Pablo]

10mm.

[Ten2six]

I got to try some of the 40 S&W deep throats loaded with 165 gr. Everglades jhp's and 9.3 gr. of Power pistol. Shot through my Bar-Sto 40 S&W barrel in my Delta Elite. Seated to 1.245 functioned the best and produced 1320 fps ave. I like this set-up!

Yup, cheap range brass.

How was your accuracy?


.

I only had 6 test rounds and one failed to feed, I was testing different seating depths. The accuracy was consistent with standard 40's that I have ran through it. Now that I have the dimensions figured out I will load up a bigger batch, or as I call it another excuse to go shooting.

[gandog56]

I don't NEED an excuse to go shooting!