Roper, the size of the target (rings) has everything to do with the scores fired for a given accuracy level of the equipment.
Old USA long range high power target rings used until the early 1970's:
V=20", 5=36" aiming bullseye, 4=54" 3=72" square target paper (original had a 2-point 20" x 72" panel on both sides; removed in the 1920's)
Great Britian long range fullbore target rings
V=14.4" (12" in Canada), 5=24", 4=48" aiming bullseye, 3=72", 2=96", 1=118" wide by 70" high target paper
USA long range high power target rings after early 1970's and adopted by the Int'l Palma Committee in 1991(?) as the standard for its matches.
X=20", 10=20", 9=30" 8=44" aiming bullseye, 7=60", 6= 72" square target paper
It's easy to see how a given shot distribution's dimensions will produce differnt scores depending on the target used. No wonder the USA set a record back then; the target's high scoring ring was 50% bigger than the British fullbore one used in virtually all other countries in Palma matches; 36" vs. 24" and the next highest ring was 54" vs. 48".