New Winchester rimfire
New to me. Has anyone seen these yet? .17 Supermag Rimfire.

I think that is Winchester’s secretive / newly launched item for the SHOT show this year and has only come out in the past few days. I assume it is intended to be a low-priced alternative to .223 / 5.56 caliber and its release is timed remarkably well based on what is happening to the prices of .223 ammo. Here are photos from the link posted:

Here is a caption from a video showing a commercial box an another one labeled “ENGINEERING SAMPLES - S17WSM20 - 20 Grn V-Max @ 3000fps”.

What are the dimensions of the case?