My "hand-cut/sanded" crown has made 5 shot groups at 100 meters, shot of the sand bags and bench rest with my .69 rifle, of 1" to 1 1/2" with it's open sights.

It's best group at 200yards (not meters) was 2 1/2" for 5 shots, made the same day as my bro also made a 2 1/2" 5 shot group at 200yards using his .62 calibre Hawken - .021" denim (10 ounce per yard) patch and .615" ball. His rifle used 127gr. 2F GOEX while mine used 140gr. 2F GOEX.
These crowns are not coned. The edges/corners of machine-cut crowns are smoothed into a rounded shape, is all.
This allows the soft lead ball and patch to conform into the bore.