I don’t remember all the details from when I was experimenting with the bb’s a few years back.
But some did as ord Sgt said, they slugged at 20 yards.
I was shooting them from my 16 gauge cylinder bore (.653) smoothbore, using brown paper bag as a shot cup. Folded on the ends, with no adhesive.
The shot column was at least 3”” long in the bore, bye standers could hear the trailing shot as they hit the backstop/ target.
It did produce a decent pattern with 30 bb’s in a 8 x11 sheet of printer paper at 20 or 25 yards & 8 penetrating the tuna can target I was shooting at..
Note…. The burnt paper shot cup in the pic..
Some would smolder, others completely disintegrated …
I probably shot less than 20 of these type loads and didn’t see any damage too the bore as a result..
I did scour the bore with steel wool wrapped brass wool wire brush with Bore Shine, just too clean any additional crud out Incase there was any..
Or