I've only had my 460 for four months and it's a S&W revolver, not an encore, but this is what I use:
Starline cases, WLR primers, H110 powder - a little below max according to the Hornady #7 manual, and Hornady 240 gr. XTP HP MAG bullets. This load is very accurate in my 460 revolver. I have not shot a deer with this load yet, but have used this bullet in a 454 Casull revolver to take several deer and it works great. Some may prefer Hornady's 300 grain XTP HP MAG, but in my mind, the 300 gr. bullet just recoils more and is more bullet than needed for whitetails. Recently, I purchased some Barnes XPB 460 bullets in 200 and 275 grains. I have not had chance to shoot them yet, but at a dollar a piece, if they are not truly and surprisingly impressive I severely doubt they will replace the Hornadys as my Go To bullet.
Regards, Chappy