Hopefully the .450Nitro ammunition will be more available.

Speaking of the .450Nitro. Winchester tried in with their .458Win to duplicate past times .450Nitro ballistics. It has been a commen knowledge that Winchester .458cal ammunitions didn´t live up to claimed ballistics...BUT..there is a BUT in the book `Expert`s on guns & shooting`(1900) by GT Teadale-Buckell on page 461(Rigby chapter) a Mr.Knight, Maneger of Curtis & Harvey conducted velocity tests on Rigby´s .450Nitro. The 480grain is 1970 ft/sec and 350Grain is 2059 ft/sec.

Maybe Winchester afterall got it right?...:LOL