Are the modern high velocity .22 loads acceptable to use in one of the older K-22 Outdoorsman revolvers?? Thanks!

They are but you are almost 100% guaranteed to get better accuracy and easier loading and ejection out of standard velocity ammo.

A!though the high velocity ammo is ok in your revolver, I can't imagine an application that standard velocity ammo won't work better.

I shot many Winchester Xpediter rounds and CCI Stingers through mine back in the early 1980's. The K22 Outdoorsman and Xpediters provided muncho conejo dinners for me.