Good day, I've recently purchased a 340 WBY MkV Lazermark (produced in Japan). I think it was a great deal, but the 340 is not that popular here (in South Africa) as components are hard to come by, ammunition prohibitively expensive (if you can locate it) and I for one wont' support the local agents by choice anyway. The rifle is in a great condition, but it will be while before I can get my paws on it, due to the licensing process. In the meantime I've been looking at the data in my manuals with a renewed interest. To my surprise most list what seem to be fairly mild loads as maximum and the 338 Win Mag will be within 75 fps of most of them and in some cases closer! Ironically my Sierra (newest; 10th I think) lists the 338 Rem Ultra as treading on the heels of the 340 Wby, but the maximum loads listed for the RUM exceed the Weatherby loads listed by 100-150 fps in the same bullet weight! I've looked around on the net and the Hodgdon website is more of the same as is Nosler. Load data seemed to list performance more along the lines of what I expected. So, from the guys with experience, what should I be able to achieve in a Weatherby chambered (i.e. factory free bore) 26" 340 with 225 and 250gr bullets? Is 250gr at 2900 fairly possible? Ideally I'd like to know whether this is possible with propellants like IMR4350/4381/7828 as our local powders can be judged against these (I don't need the charges). Finally, I can only locate 300 Wby brass and wanted to know if there was any reason not to just neck it up (aside from having the wrong headstamp which can be an issue here!) for example neck wall thickness? I can find Hornady and Nosler brass in 300 Wby and any comments on preferences will be appreciated. I'm happy to go from the ground up, but some input from those with experience will be appreciated. Thanks for any input.