Weight... 50 copper cents (3.11 grams each) should weigh 155.5 grams or 5.485 oz.
A 'modern' roll (no copper) (2.5 grams each) should weigh 125 grams or 4.409 oz.
So the 3 'unsearched' rolls below (I rolled 'em myself although I did take out the shiny stuff), have either 34 or 35 copper cents and 116 or 115 zinc ones. Or a few less copper and an extra cent or two.

-----Burton
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/