Using a 9mm para barrel in a 686 PPC gun

Rude Fat Dog · #1 03-15-2015, 10:40 AM

I want a 1:10 barrel for a PPC gun - is there a problem with using a 9mm para barrel in a .38/.357 gun ?
Thanks in advance.

Macinaw · #2 03-15-2015, 03:29 PM

Sorry wrong Info.

F224 · #3 03-15-2015, 03:56 PM

Normally the 9mm is a .355 bullet and the 38/357 is a .358. Based on the bore size, you might have some issues with pressure with the tighter bore.

colt_saa · #4 03-15-2015, 04:33 PM

I take it you are planing on having a barrel turned for your 686 and you have already located a blank with a 1:10 twist but a .355 bore diameter?

Barrels do not care what cartridge the cylinder is chambered for.

All that matters are the bore and groove diameter. The 357 Magnum projectiles have a diameter of .357 while projectiles intended for the 9MM cartridge are .355 in diameter, however a barrel intended for the 38 Super or 38ACP cartridges use projectiles of .356 diameter. Lead projectiles for any cartridge are typically .001 larger in diameter.

As mentioned shooting oversize projectiles will increase pressure. However since your goal is PPC can we safely presume it is not your intent to be shooting full Magnum loads?

IT IS HIGHLY RECOMENDED THAT FULL POWER 357 MAGNUM AMMUNITION NEVER BE FIRED IN A CUSTOM REVOVLER LIKE WE ARE DISCUSSING IN THIS THREAD. The danger still exists that a factory loaded 357 Magnum round might be chambered and fired in the finished revolver. While this will cause pressures to rise above SAAMI and CIP specifications, it is doubtful that pressure will get high enough to cause catastrophic failure of the firearm.

If you do not already have the barrel blank lined up, why not just order one of .357 bore diameter? Most all of the major manufacturers offer them in 1:10 twist

Rude Fat Dog · #5 03-15-2015, 06:18 PM

Quote:

Originally Posted by colt_saa

I take it you are planing on having a barrel turned for your 686 and you have already located a blank with a 1:10 twist but a .355 bore diameter?

Barrels do not care what cartridge the cylinder is chambered for.

All that matters are the bore and groove diameter. The 357 Magnum projectiles have a diameter of .357 while projectiles intended for the 9MM cartridge are .355 in diameter, however a barrel intended for the 38 Super or 38ACP cartridges use projectiles of .356 diameter. Lead projectiles for any cartridge are typically .001 larger in diameter.

As mentioned shooting oversize projectiles will increase pressure. However since your goal is PPC can we safely presume it is not your intent to be shooting full Magnum loads?

IT IS HIGHLY RECOMENDED THAT FULL POWER 357 MAGNUM AMMUNITION NEVER BE FIRED IN A CUSTOM REVOVLER LIKE WE ARE DISCUSSING IN THIS THREAD. The danger still exists that a factory loaded 357 Magnum round might be chambered and fired in the finished revolver. While this will cause pressures to rise above SAAMI and CIP specifications, it is doubtful that pressure will get high enough to cause catastrophic failure of the firearm.

If you do not already have the barrel blank lined up, why not just order one of .357 bore diameter? Most all of the major manufacturers offer them in 1:10 twist

Thanks for the info - who is the best supplier for a 1:10 .38/.357 barrel blank ?