No luck there. Magtech is no longer producing the MK262 Mod 1 77g SMK ammo due to losing their contract with Sierra. You can still find it occasionaly by IMI, but it's near buck a round and Gold Medal Match is $2 if you can find it. I've got a good load for 77g SMK and Alliant Power Pro Varmint. Getting high 2700's, and single digit SD's out of my 20" AR, and because I bought all the components over the past few years, it's costing me about $.40 ea...if you don't count the hours of brass prep I have in them. SGA used to sell 600 round crates of Lapua 55g loaded .223 for 40 cents a round, so I bought two as blasting ammo, and now I have the brass for precision shooting.
I don't see it changing anytime soon.