Do you have to replace the o ring for each shot. If so how fast could you get it out and get off a second shot in a hunting situation? I would think that o ring would melt pretty quick but it sure sounds like it got rid of your misfires with 209 primers. That is a beauty of a deer, is that pretty common in your area of South Dakota. I would love to hunt in the South Dakota area for pheasant and deer. Somehow I got a SD tourism guide in the mail and that is one beautiful state.