This section is for reloading and ammunition only, all loads found in here are used strictly at your own risk, if in doubt ask again.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should treated as suspect and not used.
Forum rules
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
A new one on me, I've not seen its like before.
Apart from the obvious that the example you have is made by Winchester and that it appears to be a similar case diameter to .22WRM (which it obviously isn't) I can only agree with your suggestion that it's possibly a .22 Winchester Automatic, which according to cartridges of the world was dropped by Winchester in the 1970s.
Winchester rimfire ammunition has had a an "H" stamp on it since the original .44" Henry rimfire round brought in with the 1860 Henry rifle. Oliver Winchester didn't want his name on the innovative design until he was sure it was going to be a success.
Come on Bambi get some
Imperial Good Metric Bad
Analogue Good Digital Bad
Winchester .22 Automatic ammunition was introduced with the Winchester 1903 semi-auto rifle. It was Winchester's first semi-auto and at the time there was still a lot of .22 ammunition loaded with black powder which would quickly gum up the works of a semi-auto rifle. So this ammunition was introduced to stop owners from putting the black powder ammunition into these guns. Remington did a run of the same ammunition. There has not been another gun chambered for this round other than the Winchester 1903.
Redcat
If you think you are a person of some importance, try ordering someone else's dog around.