Easy answer is 22 Hornet..
Undoubtedly. When .22wmr got unobtanium a few years back, I bought a 77/22 hornet and had it sent Randy at CPC. Punched out to K-Hornet, accurizing work, Dayton traister trigger. Accurate and very efficient use of powder.
I have 25,000ish .22lr’s though so not real worried at this point.