Crazy,

There are a few less expensive ways to improve the accuracy of your SPS.

#1 a basic trigger job by a professional gunsmith.

#2 have the barrel hand lapped by a professional gunsmith.

#3 try as many different types of ammo to see which one "your" gun shoots best.

#4 shoot from a steady rest

#5 practice good form; control breathing, squeeze trigger slowly with nearer the tip of first digit, stay behind the scope with a good follow through.