I have just aquired a .460 XVR with 8.3" barrel but have yet to light the cannon up as the factory ammo is near impossible to get in Canada if at all.Same goes for the brass as there are only 2 manufacturers being Hornady and Starline,Starline being the prefered as it shows a high degree of quality control as when you examine new unprimed brass the flash hole is already qualified by means of a taper induced by a flash hole unifier.Have just assembled some loads using Starline brass,Win. Lg. Rifle,Magnum primers and Hornady 250 gr. SST bullets(originally a muzzleloader saboted bullet) minus the cannelure.I've applied a cannelure using a tool made by CH4D that I borrowed as the jacket wall thickness is .050 according to a Hornady tech. I spoke to on their hot-line who also confirmed that is very useable for the .460 as long as a heavy crimp is attainable.This SST bullet is absolutely the longest workable for overall length at 2.330 which just happens to be the exact cylinder length by co-incidence.Load data was downloaded from the Hogdon website and I'm just a few days away from it's first range session.Cabelas stocks all the components as well as the Hornady 200 gr. SST factory loading at 2300 ft/sec. with the longer 10.6" barrel.Powders suited to this cartridge are H-110,H-4227(my choice for the first loads).The choice of primer is dictated by the brand of brass,Starline using lg.rifle mag and Hornady (unsure) but apparently something other than lg rifle.Will post a new thread when data is in from first range session.Be sure to tighten the muzzle brake accordingly or you'll have a very undesireable result.Good luck
jackpine