I have done 44 grains of RL15 in Lapua brass with 168gr Hornady A-maxes and found it a little warm, especially on summer days. ( pun intended). Backed off to 43.5, still a stout load but not excessive. Averages a hair over 2700fps, and accurate enough for me out of my 24" 10FP.

Are you using the 168's or 175's? I don't think you stated, unless I missed it.

Oh, and welcome to the forum, and to handloading. Both are extremely addictive.