9mm Bullet Through .38 Special Barrel? [Archive] - Glock Talk

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doc540
02-12-2010, 11:52
Supposing all other factors (cylinder bore, pressure rating, etc) were acceptable, could a 9mm bullet be shot through a barrel bored for .38 Special?

And, if so, could it be "reasonably" accurate out to 15-25 yds.?:dunno:

Glock2008
02-12-2010, 12:34
Yeah it will work. I'm not sure how accuarate though. At 15 yards it might not be so bad. If your using lead bullets it may work out to 25 yards as the bullet should slug up to the barrel size, as i believe a 9mm is a .356 bullet and a .38 is a .357. I have never tried this though.

Bobshouse
02-12-2010, 23:25
Supposing all other factors (cylinder bore, pressure rating, etc) were acceptable, could a 9mm bullet be shot through a barrel bored for .38 Special?

And, if so, could it be "reasonably" accurate out to 15-25 yds.?:dunno:

I wouldn't bother. The .38 is a rimmed cartridge, the 9mm isn't. It would Probably slide forward in the cylinder to make it impossible for the firing pin to strike the primer with enough force to set it off.

GIockGuy24
02-12-2010, 23:39
Many Colt revolvers have bores that are very tight or exactly what would be considered 9mm. Ruger made switch-cylinder Blackhawks in 357 / 9mm and some people report that accuracy isn't very good with 9mm bullets.

Singlestack Wonder
02-12-2010, 23:50
9mm is actually .355". The .38 Super is .356". The .38 and .357 are .357".

doc540
02-13-2010, 17:44
Apart from the issue of "yes or no", how would you approach the idea of converting a D frame Colt from .38 to 9mm?

It appears a new cylinder would need to be machined.

What say you?

srd
02-13-2010, 17:53
I used to own a .357/9mm Blackhawk convertible. Yes it had an interchangeable cylinder. Accuracy with the 9 was poor at best with lead bullets. Leading was also an issue due to the .358 dia barrel and the .356 dia. 9 mm. I still have the 9mm cylinder for it but the rest was stolen several years ago. Would i buy another one to play with ? No

frankmako
02-13-2010, 18:04
back in the 80's i had a hunter pistol silhouette load that was a speer 88gr hp seated inside a 357 case. the bullet was seated down inside the case on top of the powder. i shot this in a 357 mag thompson center contender. this was a good load and was shot by many during matches. i have seen many 38/39 hits out of 40 during a match with this load. had something to do with the forceing cone of the tc barrel that made it work. don't know whom came up with the load, i just used it like several others.

1006
02-13-2010, 18:30
call this guy:

http://www.pinnacle-guns.com/index.asp

He does alot of multi-caliber/moon clip conversions on S&W's.

doc540
02-13-2010, 18:48
call this guy:

http://www.pinnacle-guns.com/index.asp

He does alot of multi-caliber/moon clip conversions on S&W's.

Spoke with Mark last week.

He machines factory S&W cylinders but can't convert a Colt .38 cylinder to 9mm.

Super nice guy that does some GREAT work. Everyone should visit his site and look at the work he's done!

jaysouth
02-14-2010, 20:27
9mm is actually .355". The .38 Super is .356". The .38 and .357 are .357".


Those are "nominal" dimensions. Without actually slugging your barrel, you are guessing. Depends upon individual manufacturer.

I had several thousand 115 gr. SWC cast bullets sized to .356. Worked fine in .38 Model 14 smith and fine in a Glock with Lone Wolf barrel.

The difference between .355 and .357 is less than the thickness of a cigarette paper.

Each and every barrel is a law into itself.

doc540
02-18-2010, 11:21
Received a reply from Jim at FAMCO today:

Doc,
Sorry this took so long, but we had to do some digging.

As for a cylinder sized for 38 special (at 17,600 psi for normal pressure and 19,100 psi for 38 Spl +P), we don't think making one even for 9mm normal pressure is safe (at 36,100 psi) much less 9mm +P (at 39,700 psi).

I know this isnít what you wanted to hear, but its safety first at FAMCO Inc.

Regards,
_______________________________________________

Jim Kinkopf
President
FAMCO