I have heard that steel can do some damage to over and under and side by side guns (guns with two barrels attached to each other) depending on how they are choked. Is that what you are asking about?
The 20 ga. and steel should be fine for the killing birds end of things.
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Robin,
Archery Sept. 1 - Oct. 31 Muzzleloader and Crossbow Oct. 1 - Oct. 31 Rifle Nov. 25 - Nov. 30
...And HIS kingdom shall have no end...
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