I have a Sako L579(oddly enough it has the AII style safety & shroud) in .284. It feeds well but I can't load any nosler bullet in it because of the 2.8" mag length. I'm limited to the short-for-their-weight Speer 130 & 145 bullets & they haven't been holding up too well on deer. How difficult and expensive would it be to lengthen the mag box on this Sako? Are there any aftermarket parts(box?) to help with this? Is there anyone who can be recommended to do the work?

It is one of my favorite hunting rifles...#3 Hart SS 21#, Bansner stock, Conetrol mounts, 3.5 x 10mm Leupold, Timney trigger



Thanks in advance for the help!!!