Mt AI,
You can sort this out by using 2 targets side by side, shoot the right barrel on the target then quickly shoot the left barrel on the left target. Then after cooling, repeat the process. Once the correct number of pairs have been fired, place one target on top of the other and mark the bullet impacts on one target through the holes in the other one. This prevents delaying the second shot in a pair to locate the first.
Mike, thank you and you mentioned this in an earlier post and I'll implement that method next time out.
Chris and Mike, I'll load up some identical rounds and shoot at 50 yards this time and see where things land and keep stretching until the groups exceed 'minute of deer' or so.
Your advice and others has been invaluable. Just wish there was more time to load, shoot, etc. but we get out when we can.