Off sand bags using 77 grain moly Black Hills ammunition, I put 4 shots into a group of 2.75" at 300 yards. Most would say that a chrome lined barrel is not capable of that level of accuracy, but that is not correct.
Will I be the first to note "4-shot group" and "sample of one"?

It's worth noting that provided you are using a barrel from a known high quality maker, ammo plays a HUGE part in group size and accuracy. Black Hills has a very strong reputation. You get what you pay for.

This isn't the first i've read of 77gr SMKs doing better past 200 yards than they do at 100 yards.