the bullet weight you want to use might not be what your gun would prefer.
those bullets are on the heavy side for a 223. im not sure of the barrel twist
of the gun youve selected. a 9 twist would work ok wheras a slower twist
would not. id be checking that before you buy those bullets. certainly the heavier
bullet would have an advantage with wind. but it has to shoot well first and foremost.
i have 2 varmit version savages which are the lefty model 12. both have a 9 twist.
1 is a 22x250 ackley in which i shoot 69 gr sierras. the other a 223 in which i shoot
50 to 55 gr bullets. these are strictly varmit hunting guns i dont compete with them.
the 223 is a wonderfull gun to own as it is so versatile.
on the other hand it wouldnt be my choice to compete with. i could see myself getting my
feet wet with one however.
sinclair or midway would have all the bullets. as would no doubt cabellas.