[amafrank]

Despite thread jumpers trying to sell you stuff other than what you are asking about, the 338BR is a great cartridge and quite versatile. It will do what you want. As richard noted any .338 will have about the same ballistics if you're starting at the same speed. The advantage to the 338 BR is that it will fit your bolt face unmodified and is already pretty well tried and true. The .338 bullet has great ballistics and if you've got a scope with enough elevation adjustment you can get out there to 1000yds. There is also enough room in the BR case to load supersonic which gives you more possibilities. Thats a big advantage over other subsonic 338's. Depending on exactly what you want other cartridges might be just as good. The 510 is really neat but brass is expensive and harder to make. Its also a pretty large and long cartridge so mods would have to be made on the bolt and receiver to make your current rifle action work. It does do the job though and has the advantage of being able to find "fun" bullets like tracers, API and APIT and even spotter tracers though they require a special throating reamer be used. So the basic question is what do you want and what rifle are you starting with. From what you've posted the .338BR is an excellent choice.

Hope that helps and if I feel the need to sell you something I'll post it on the for sale boards where those posts belong.

Frank