Re: Need a good load for M1A 168 gr projectile?
I use 42.2gr of IMR4064 for the 175SMK <*> Edited to mention Remington brass <*>, and would suggest you try that as is before going any higher; and if you did go higher, don't go far.
Hotloads can be more accurate, and this one is decidedly warm and nearing a hotload; but long experience says genuine hotloads are never worth the throat wear. If you're not sure, look at the fired primers. If the edges are square sharp, rather than at least small rounded, it's a hotload.
Greg