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B.L.E.,
I beg to differ with you about velocities and shot patterns from short barrels vs. longer barrels.
You can gain considerable speed and better patterns by using a longer barrel, especially with handloads.
Prime example is I shot a 1 3/4 oz #6 Hevishot Handload that I developed, through both a 23" 870 SM, and a 26" 870 SM. Same exact choke, same exact load.
The 23" gun was averaging around 160 pellets in a 10" circle at 40 yds, with a MV of 1121 fps
The 26" gun was averaging around 290 pellets in a 10" circle at 40 yds, with a MV of 1230
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