York Family Shooting Match?
These guns look like the black powder rifles used in the York (Sgt ALVIN YORK) family shooting matches that were shown on cable TV some time back. They are capable of impressive accuracy. Like many bench rest firearms of smokeless powder variety, they are very heavy (for recoil reduction), and bulky (for stability); they are not intended to be fired from the shoulder.
As for a caption - I'm waiting for the sixth guy to get in line before I shoot them all with my one shot.