Lefaucheux pistol caliber??

Caperss · October 27, 2018, 07:16 AM

I know this has been discussed before but for some reason I can't get the search window to stay open. I have a Lefaucheux revolver about an 1850. I want to reload some pin fire ammo for it. It has been checked by a reliable gunsmith and given the ok. I want to make sure I have the correct caliber before I order the expensive components. The six cylinder bores measure .33" in the rear and .30 in the front, the muzzle also measures .30. Is this what is referee to as their 7mm or.32 caliber? Does anyone have a suggeston for componants?

**Mike Irwin** · October 28, 2018, 07:07 AM

It sounds like the 7mm round.

It wouldn't be a 9mm, the bore is too small.

tangolima · October 28, 2018, 12:05 PM

0.300" at the muzzle. Is it groove diameter or land diameter? Did the smith slug the bore to determine? The groove diameter is the key, and you need to slug the bore to measure.

For an old revolver like that, it is actually quite simple. The cast bullet should 0.001" to 0.002" bigger than the groove diameter. The throat (front) of the cylinder hole should be the same as the bullet diameter. You may need to ream the cylinder to fit the bullet and the casing.

-TL

Sent from my SM-G930T using Tapatalk

October 27, 2018, 07:16 AM	#1
Caperss Junior Member Join Date: October 26, 2018 Posts: 1	Lefaucheux pistol caliber?? I know this has been discussed before but for some reason I can't get the search window to stay open. I have a Lefaucheux revolver about an 1850. I want to reload some pin fire ammo for it. It has been checked by a reliable gunsmith and given the ok. I want to make sure I have the correct caliber before I order the expensive components. The six cylinder bores measure .33" in the rear and .30 in the front, the muzzle also measures .30. Is this what is referee to as their 7mm or.32 caliber? Does anyone have a suggeston for componants?

October 28, 2018, 07:07 AM	#2
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,390	It sounds like the 7mm round. It wouldn't be a 9mm, the bore is too small. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.

October 28, 2018, 12:05 PM	#3
tangolima Senior Member Join Date: September 28, 2013 Posts: 3,829	0.300" at the muzzle. Is it groove diameter or land diameter? Did the smith slug the bore to determine? The groove diameter is the key, and you need to slug the bore to measure. For an old revolver like that, it is actually quite simple. The cast bullet should 0.001" to 0.002" bigger than the groove diameter. The throat (front) of the cylinder hole should be the same as the bullet diameter. You may need to ream the cylinder to fit the bullet and the casing. -TL Sent from my SM-G930T using Tapatalk