Have worked with both 140 and 150 sierra SPBT. Best results with 150. Used both H4831 and IMR7977. The 7977 load proved out to 1/2" @ 100yds. Details; Win Br, CCI 200, And 67 Gr. 7977. The barrel is an Apache prefit on a Savage 110. Awaiting an order of brass and will reconfirm and get chrony results. Your results may vary - So work your loads carefully in your rifle so as to prevent over pressure or accidents.
