RE: .410 for deer
One year at camp, my cousin Beth Ann decided she wanted to hunt and the only gun her dad had for her to use was a J.C. Higgens .410
All day long her brother and his friends shot to sight in their rifles. They couldn't even hit a 1 inch bulls eye at 100 yards.
Right before it got dark, my Uncle gave my cousin one shot gun shell and told her to take a good aim and shoot at the target.
You guessed it - bulls eye - and with no sights, scope or anything else to help her get the job done!