TRX
06-23-2012, 12:52 PM
I have a No.4Mk1 Enfield I'm rebarreling to .45-70. Now I'm to where I need to set the headspace. The bolt has the usual #3 head.
"So," I said, "I'm too lazy to go dig out that box of .45-70, I'll just look the rim thickness up on the internet." And I found... chaos, with rim thickness figures all over the place.
"To heck with that," I said, and went into the other room and eventually rooted out a brand new box of unfired Remington .45-70. Applying my calipers to the rims, I found... chaos. I checked for dings on the rims, made sure I was holding the calipers straight, etc. Measuring the whole box, checking at the "-" between "R-P". The rims range from .061 to .068" thick.
I could understand some variation in rim thickness between brands, but .007" between new cartridges from the same box is crazy. Has anyone else run into this, or did I get a box made up from a bad lot of brass?
"So," I said, "I'm too lazy to go dig out that box of .45-70, I'll just look the rim thickness up on the internet." And I found... chaos, with rim thickness figures all over the place.
"To heck with that," I said, and went into the other room and eventually rooted out a brand new box of unfired Remington .45-70. Applying my calipers to the rims, I found... chaos. I checked for dings on the rims, made sure I was holding the calipers straight, etc. Measuring the whole box, checking at the "-" between "R-P". The rims range from .061 to .068" thick.
I could understand some variation in rim thickness between brands, but .007" between new cartridges from the same box is crazy. Has anyone else run into this, or did I get a box made up from a bad lot of brass?