Home Forums Reloading Big Game Rifles 375 HH Case Stretch on New Brass

The initial resizing of NEW brass, followed by trimming, is with the die set to bump the shellholder.
Once the case is fireformed to the chamber by the "ridge" method, the die should be set to only size enough to allow easy chambering. Better yet, use a Lee Collet or other neck sizing die. There is some stretch as the case is enlarged to fully fit the chamber, but nothing like takes place when a case that headspaces on a belt has a shouder a long way from the chamber's shoulder. (The 300 Win Mag is among the worst "stretchers".)
The 375 H&H is a low pressure cartridge and full length sizing should not be required as long as loads are reasonable. I have loaded 375s 10 times or more, just neck sizing. Trimmed em' once after 5 loads. BTW, brass being a bit short is not really an issue in the 375 H&H.