As you can see, your .22/250 will probably work with many medium burn rate powder.

I have owned 2 rifles so chambered, an ADL from 1972-1985, and a M70 with a Shilen barrel since 1985.

I have mostly used 55 and 60 grain bullets with IMR 4320, 4895, 3031, H414, IMR 4064, IMR 4350 powders. With both rifles the accuracy difference was negligible despite what powder was used.

So, as the man said try what you have on hand.

If your starting fresh pick one of the listed choices and you should get great results.