Ugh, Kemosabe, great idea! Here's some data on my 870s.
#1, my oldest, the HD shotgun.No choke,long cone, 18" bbl. A large aperture peep, good trigger.
Winchester standard 00, 20-24" at 25 yards.
Estate "SWAT" R/R 00, 16-20" at 25 yards.
Slugs:
Rottweil Brenneke, 2 1/2" at 50 yards.
KO Brenneke, same as above at 50 and less than 5" at 100 yards. Current deer load.
Winchester 1 oz HP slug, 2 1/2" at 50 yards.
Groups and patterns measured edge to edge.
#2, the 870 TB. 30" Extra Full (.038") bbl. Shot with reload of 1 oz 8 1/2s at 1150 FPS, a tight patterning load. Alternate,same but with 7 1/2s for handicap.
At 32 yards(Max I can pattern at), almost all pellets in 24-26".
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