iam having a problem with my 308 norma. it is a fng action hart barrel timminy triger bell carlson stock. i cant get an group at 100 under 4inch. i had the crown recut replaced the rings and base to tally one peace. i also found out the jump is aprox. 3/4 inch seems like to much? i also replaced the scope hight end tack. i cant lode to the lansgroves the round will not fit into the magwell. is the jump to long and if so can the barrel be screwed in to take up the jump. i could really use some thoughts. thank.