Everything I feed my rifle seems to group better than I am able to shoot at 100yds with a 9 power scope (1.375" or better).
Most guns will shoot that well or better with factory loads without a boss and the drawbacks that it adds.Tikka rifles for instance must shoot 1" groups before leaving the factory and they cost less than the boss equipped rifles.The 9 power scope is not the problem as many people shoot much smaller groups using 9 power scopes.It sounds like you need more shooting practise to take advantage of your rifles accuracy potential.