Copper plated #7 1/2 in 20 gauge.
Copper plated # 6 in 12 gauge.
Nickle plated # 7 1/2 in the 20 gauge flintlock

Those give the best patterns in my guns and plenty of penetration at the distances I will shoot.

"The only thing necessary for the triumph of evil is for good men to do nothing."
Edmund Burke 1795

"Give me liberty or give me death"
Patrick Henry 1775