All righty then- I've been perusing the Viht reloading manual, and it seems that the 5 prefix powders can offer a bit more velocity- no big deal for most stalking calibers, but I could use a bit more Vooma from my Remington's 26" barrel for F-TR.
So, what are the downsides to using a 5 series powder as opposed to the standard propellant? More bore fouling? Bigger SD? Or are there no obvious disadvantages to using N-540 instead of N-140?