I have been stumbling around, learning about hand loading since the 1960s, and somehow, I never ran into this problem.
In loading for my wife's 7mm-08 I full length resized some .308Win. to 7mm. The 7mm-08 fired brass had been reloadong fine, but when I tried to seat the 7mm bullets into the resized .308Win cases,I got a bulge in the neck, which was enough to cause the cartridges not to chamber. My bullets measured .284", or 7.21mm, so nothing wrong with the bullets.
I then miked the walls of the neck. Wow! The sized 7mm-08 brass miked .0013" to .0014". The necked down .308Win. measured .0018" to .0019". This would indicate the need for a neck turning tool and one more piece of work to do.
I considering just buying 100 new 7mm-08 cases and forget the trouble of necking down .308Win. Brass. Once we get the wife's rifle zeroed in, I doubt that she will fire more than 50 rds. per year. I would not need the neck turning tool for any other caliber that I am loading.
Funny thing is, I have necked down a lot of 30-06 cases to make .270Win. brass. I also neck 30-30 brass down to 6mm! Never had any trouble with rounds not chambering, and'or bulges in the neck.
Anything else that you can recommend would be appreciated.
Steven in DeLand, FL
The dream is more important than the reality!