Why do you need custom?
Shot my 6x6, @ 550 lasered yards with a Ruger, 338 WinMag...not custom...righ where I aimed: middle of right front shoulder up hill!
Factory 200 grain, found bullet under hide at the top of the left front shoulder.
I am selling my stainless M-70, 338 win mag here, pix's posted.
WTS, Stnless, M-70, 338 Win Mag: LIKE/AS NEW !!!