TAW1126, Not sure of the case capacity diferential between the 416 RM and the 404Jeffery, but I load and shoot mostly cast in my 404 with a 350gn in various alloys.
From a plinking load at 1400fps with 20gn Red Dot and WLR primers using 50/50 ww/Pb to a 1900fps load with the same alloy or straight ww over 63gn H4350 - ADI2209 with WLR primers through to lino at 2365 with WLRM and 74gn Varget - ADI2208 and a HT 90/10 ww/lino at 2416fps over 87gn H4350 - ADI2209 with FED 215's. All with GC and in Norma brass. A load for any and all occasions and any one of them would take a piggy.

Von Gruff.