Need to find substitute for Winchester large rifle primer. here are my choices:
cci large rifle primer
federal 215 magnum primer
winchester large rifle magnum primer

The use will be for 22-250 with 50gr vmax.

CCI

I like the CCI 200's as well or better than any other LR primer. Seems as though they are the only ones you can find anymore too.

Is Winchester no longer marketing their WLR primer?

I assume they are still selling them, but my normal sources can't get any and have been waiting for some time now.

Heres a good link for you..primer cross ref.
http://www.handloads.com/misc/primers.asp