I like the Redding tapered expanders. They are slick. Ive got them in my 257 Roberts improved, 338-06 improved, and 375 whelen improved dies. They are great when necking up brass or expanding sized brass.

I was trying using stuff I already had instead of buying more stuff. I think it is a solid way of doing things but is easier with die sets that have threaded decapping rods.

I tried the lee collet neck sizing mandrel to expand brass. Didn’t like it. I love the die as a neck sizer though.


JTD