My K31 is a bit of a beast with GP11 factory. If I shoot at Bisley, 200 yards I load up 34/36 gns of 3031 over 174 fmj and this produces an accurate but less shoulder jarring load. The lyman reloading book provides these loads with 3031

180gn fmj 35gns 2044fps 39gns 2320fps

amc577