I always thought this CDL SF model would really benefit from rechambering to the 280 Ackley Improved. I played with two 280's in my short lifetime. My first one was a Ruger 77 , back in '76 and it was the first rifle I ever handloaded for, with a Lee Classic Loader, ha. I made my longest shot on a buck that year, 276 long steps down a pipeline ROW, Hornady 139 SP over IMR 4831. I traded that rifle off for a Colt Python, which was later traded for one of the first Remington 700 Classics in .257 roberts, which later became a .257 Roberts Ackley Improved, my first wildcat.
When I moved out here to Utah, I traded for a Mod 700 Mountain Rifle, and had it rechambered to the AI. I only gained 50fps out of that 22" barrel, ha. It was very finicky and only shot two bullets very well. The Nosler 150 Ballistic tip and the Speer 160sp HotCor. I used R22 for both but the data escapes me now. I liked the 280 AI, but it needs a longer barrel. I now use my 7mm08 as a .280's replacement. If I need speed, I go all the way to my 7mm RUM. Overall, the 280 is a real killer, and that CDLSF is one gorgeous rifle!