Are you sure this table is for 20 mm bands....the original band lenth on an RA 100 cm gun is 77 cm....looking at you table, it say 60 to 65...........more than 11 cm difference....what do you think.:head
I can't think why band diameter would make a difference regarding band length, but if someone knows a good explanation please jump in.
Ihab, you will get some extra power by shortening your band to 65 cm. For reference I have followed this table on 20mm bands for a 90cm gun and it works great.