you won't find a 280 in either one.7-08 though,same bullet dia more efficient cartridge for that barrel length.the 280 really needs a longer barrel to acheive optimum performance.the biggest diference in the two is weight and l.o.p.the compact is shorter l.o.p. and has a lighter barrel contour,less steel less weight.the frontier has a l.o.p the same as a mII but has a heavy contour barrel,i think ruger did this so they could utilize the scope mounting rib off their #1 rifles,and had enough meat to mount it to.the frontier is a soggy little piece.i am considering one in .358 win,but i might just rebarrel a compact,good luck,adker