Home Forums Reloading Big Game Rifles LC 308 sized to 7-08

For those of you smarter than I am, A friend bought a used 7-08 and wants me to help him reload, that is fine with me. He can get quite a bit of LC 308 brass to size down, my question is would I have to turn the necks down? My little brain is telling me yes but I'm not sure.

I neck brass up and down and the only stuff that I have to turn or ream is LC brass. My guess is...probably.

RH

Not likely will it be necessary to turn. If you measure the neck walls of the 308 case and size it down to 7mm, the change in thickness, if any, will be so small you likely can't measure it. I've sized brass up and down and if in your sizing you end up with the neck of the new size in the same place as the original, the difference in neck wall thickness will be far less than .001". If your new case neck is into the body of the parent case, you absolutely have to either turn or ream.

I've gone from 7mm to 338 without any measureable thinning. If any it would be in the tens of thousandths. I've also necked down from 358 to both 338 and 7mm and have been unable to measure the difference. I measured with a tubing mike, thousandths capable.

Aren't those LC cases going to be a little beefier anyways, including the neck area?

I have been working through a couple hundred LC .308 cases and they are a bitch as it is to get on and off my .30cal trimmer pilot. I have to tumbled them first,copper brush the inside necks, and dip in mica just to be able to work them on and off the trimmer pilot.

good luck

Easy to measure and compare, but the difference, if any, can't be much in the necks. Not real likely.

Probably not if you're talking about a factory chamber. If I had to neck turn the stuff, I'd tell your buddy to pitch it and buy some for real 7-08 brass. Life is too short to neck turn brass unless you're shooting in the Olympics or such.