as reported in the january issue of G&A seems as though they might exist, though ballistics sound promising for the people who like amll bullets fast. claims of 200fps faster than a 22-250. though even if those are a little tweaked a 100fps faster is a improvemnt if you like that sort of thing. hopefully G&A put a call into winchester before running the blurb

propmahn
save the world, reload your brass