Odd reloading die question

by Hoot , Diversityville, Liberal-sota, Saturday, February 11, 2012, 11:20 (4617 days ago)

I'd like to figure out if my 7mm Rem Mag dies have enough room for a 3/8" long neck. What would you suggest to figure this out? I was thinking of making a CerroSafe casting might be the best way to go. Other ideas?

Thanks!