it may be that your 20 gauge is a light weight and that will cause it to kick like a 16 ga. i have a 20 lc smith with 2 1/2 inch chambers under 6 lounds..i shoot 2 3/4 inch lite loads through it..off the shelf ammo... i can not tell the diferance between the 2 1/2 inch and the 2 3/4 inch shells both kick like a 16 ga....charlie
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