Sporter rifles are quite capable of small groups. If not, please don't tell my 110 synthetic stocked 7mm RM, it still thinks that 1/2" groups are what it is supposed to do. Since you have a Lead Sled and that cut your groups down then some of the grouping issue may be from you. Another, most likely larger part, is the ammo you are using. I would look at something with a Nosler or Hornady bullet.