Go to a linen store, even Wal Mart, and buy a pair of nice Egyptian cotton pillow cases with the finest weave you can find... like 600 tpi or finer. Then cut 'em up into 3/4" squares.
He didn't say it was an 8" group, he said all three were within 8" of the bullseye... might have been a 1" group...
My four Jukar derringers.