Mine's a Zastava (got rid of the ugly stock) that shoots those 139gn SST's very well. I just sold a 308 I didn't need, and that left a pound of Varget being unemployed. I may give it a run in my 22/250.
My Zastava shoots very accurately with 175-grain Speer Grand Slams and the old Hornady Round Nose Interlocks. What stock did you drop yours in?
"An archer sees how far he can be from a target and still hit it, a bowhunter sees how close he can get before he shoots." It is certainly easy to use that same line of thinking with firearms. -- Unknown