Larry - One last thought before you open the chokes on your vintage gun. RST and Polywad make low pressure spreader loads. The Polywad DoubleWide will open your pattern approximately two choke constrictions. The Polywad shells only come in 8 shot at 7/8 oz. so maybe not what you want for hunting. I have used the DoubleWides for clays and they work very nice. I believe the RST shells are also 7/8 oz. but have different shot sizes. Maybe something to try before you take metal off the gun.