I don't normally spend much time patterning my shotguns, mostly because there is no setup close enough that affords me the opportunity. This week at the Grand I purchased a used Kolar Max T/A combo top single. I used their pattern board to check it out since I was having trouble shooting with the top single.
The pattern board had a raised "bullseye" as an aiming point. It was shaped like a mushroom with a domed top. The other pattern boards I have used are just flat. I noticed the majority of the shot hit the bullseye but the domed shaped deflected the shot that hit it causing the area around the bullseye for about 12" to 16" to be relatively free of any shot marks in the grease.
Anyone know why the bullseye on this is designed this way. The only thing I can think of is to minimize the damage to the plate if everyone just shot to a flat bullseye, i.e. by deflecting the concentrated shot pattern in the center the plate will last longer? Sounds logical but makes it more difficult to read the patterns.
Would appreciate anyone who is more knowledgeable than me on patterning a gun to comment. Thanks.
Additional info on the bullseye;
It is a separate piece from the board. It is shaped like a mushroom and I assume either welded to the board or bolted so that it can be replaced.