Originally Posted by stansdds

I'd say that the chronograph was too close to the muzzle with the revolver and H110 ammo. H110/W296 produce one heck of a blast, lots of flash, and hot, burning powder may still be exiting the muzzle and following the bullet. The blast and powder can confuse a chronograph. I always put my Shooting Chrony 15 feet from the muzzle with this powder. With any of the faster burning powders, I can put the chrono 10 feet from the muzzle and not have any problems.