Anyone know what the COR/compression rating for the approved softballs used in these organizations

I play in a senior weekday league and anyone under 70 has to use a NON SSUSA approved bat, so probably a USSSA bat is best?

Primarily looking for what bat would work best with senior approved balls, have been told maybe an older 220 compression USSSA bat is the best bet.

I think the senior league uses a 44/375 ball.

SSUSA: Compression is 375, COR is 44.

USSSA has three different standards depending on tournament or league:
ProM - Compression is 375, COR is 44.
Classic M - Compression is 325, COR is 40.
M+ - Compression is 270 , COR is 52.

ASA/USA: Compression is 300, COR is 52.

NSA: Compression is 400, COR is 44.

I would recommend a “linear” ASA/USA bat for a senior league that can’t use senior bats. The linear ASA bats are 1450/220 compression. That’s not as hot as a senior bat but hotter than a standard 240 compression USSSA bat. The non-linear ASA bats are to fragile to use with 44/375 balls.