Mt -
Howdy !
Mine is a 2y.o. XLR . An absolutely fabulous rifle, I must say !
IMHO - for both/either "J"-word or cast; might I suggest IMR3031 ?
Lyman's .35Rem reloading info for both, seems spot-on.
I have yet to try some .357" cal poly-tipped swaged 175gr BTs; that I garnered by taking them out of a saboted .45cal muzzle loader scab pack. The same vendor offers poly-tipped .357" cal BTs of 195 & 200gr.
These might be utilized for my first go @ paper patching. We'll see.....
I have had great success using Lees " Collet NS Die " for .35Rem.
I simply keep sanding-down the die's mandrel OD, until the desired level of neck tension is reached. Additional mandrels only cost around $7.50.
Lee will factory redux mandrel diameter ( only ) .001", for a $5.00 or so fee.
With regards,
357Mag