But first you need to find the regulation of that Fraser! If it's 300 as we're begining to suspect,75% of 300 is 225. I think that theres a 232 grn made. If so that'd be about as close as you could get with factory bullet.
But you could fire up your 'special machine and make some the right weight. As WC said full load just like your regular one just lighter bullets.
My 450's use 480 and 500 just fine so 75% is 350. Hornady just happens to have that one for my plinking loads.