Thread: First attempt at necking down 308 to 7mm08

Originally Posted by RimfireNZ

Damn it, I was in a rush so no didn't chamfer it. There's part of the problem. I was doing half a dozen other things after coming back from the range and dropping a bullet in was an afterthought. And no the seating die isn't set too low on this one.

When you actually site a projectile in the necked down 308 brass, then do the same with the 7mm08 round you can really see that the round isn't gonna fit in the necked down 308. It needs trimming on the inside. I'll measure it up tomorrow when I'm back over there.

My house is too small so my reloading room is at my folks in town.

Unless you are not using your expander in the FL die you will always need to outside turn if things are tight. 243 7-08 308 all going to form internally to the expander used not the die. Something looks proper fucked up with your cases. What's dies?

Originally Posted by kiwijames

Unless you are not using your expander in the FL die you will always need to outside turn if things are tight. 243 7-08 308 all going to form internally to the expander used not the die. Something looks proper fucked up with your cases. What's dies?

Just the basic Lee ones for 7mm08. I took out the decapping pin and I assume that's the expander? I can't actually resize the cases with that in. It doesn't get all the way in.

Take it out, put them through the fl die, then they measure up at least externally, but not internally.

Let me get some proper measurements for you guys tomorrow. Maybe that'll give you some more idea of what's going on.


This shouldn't be this hard, but i've only done factory ammo reloading before for a few calibers. That's easy cos you only need two dies and once it's set up, that's it