A few years back, I got the brass bucket from my club's sight in days. This was in Pa. and the weekend before buck season started. 30-06 was far and away the most prevalent empty in it. 243 was second (about half as many) then the 270 and 30-30. 308, 6mm Rem, 260, 35 Rem and others were there but not in any great numbers.
It's not definite numbers because it might take more shots to sight in a 30-06 than a 243 and many folks kept their brass but the trend was pretty solid, 30-06 was Numero Uno. Seems to me they had about 80 guns come through the line.
