They did the 30cal stuff on a bolt action, no issues there.
They did the 556/6mm on a gas gun (where are all louder than 30cal cans on bolt action at the shooter ear as you could expect). For those of us that shoot 223/6mm bolt actions it would have been nice to know how the caliber specific bore cans worked on those platforms across the field of those.
Beggars can't be choosers I know.

. Dunno if its reasonable instead look at muzzle volume on those cans instead to try and get a feel for performance.