I ran steel BBs in mine as well as hevishot BB before I moved over to the dark side and opened it up a bit. It just produced unacceptable patterns except with 2s. I primarily hunt big heavy Canadas. Opening up works super for me. Might not for everyone. I think my choke measured .693 as well. It is a used but not abused 1953 gun. Now I try to use my EH most of the time. It is just too much fun to leave it at home.
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