are the action screws the correct tension???? if they arent a SMLE wont group worth a damn.... you can get 150grn and 180grn soft point ammo ,your rifle will show a distinct liking for one over the other.... having rifle mis fire is really really bad for grouping as it will/can cause you to flinch like no ones business...you dont know if its going to work or not... if you THINK the ammo is inconsistant the rifle will KNOW it is ,rear locking actions like the SMLE are well known for chucking different ammo to different points or impact...if two of the loads were say 2700fps and other two were say 2500fps (you said they kicked different) they would in all probability go to diferent points .in front locking action diference might only be verticle due to speed but with rear locking all bets are off...hope that helps
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