.264 or 7mm Brass for .257 Roy?
I'm going to use either 7mm Rem Mag or .264 Win Mag brass for my .257 Weatherby, and was wondering which one would be preferable.
I've read that either work, but the necks are a little shorter than Weatherby brass. Which one would result in the longest neck? Seems to me that the 7mm probably would, but I don't know if that is necessarily the case.
Another concern is case loss during the initial sizing. When I was running a 25-284, until I started using the seating die (conventional design) as an intermediate step, I was loosing probably 50% of the cases when going from 284 case to 25-284 case. I would like to use my seater as an intermediate sizing step with 7mm brass (if I decide to go with 7mm brass) but now I use Forster's straight line seating dies and don't know if they will support being used in such a manner. If I use .264 brass, I am pretty sure that no intermediate step will be needed.
I guess the only possible advantage to using 7mm brass might be a slightly longer neck, but I don't even know if this is the actual case. Has anyone tried both?