Pete - are you sure that Remington ever actually reloaded ammunition?
My understanding was that the “O” primer was a commercial product from
Remington. We never had any of them in the 36 years I worked at the SF
Gun Exchange, so I assumed that perhaps they were primers supplied in bulk
to reloading companies. Maybe a totally wrong assumption. However, I think
it would be a rare thing when major ammunition companies reload ammunition,
other than perhaps when developing new loads or calibers to sell. The “O” primer
shows up too often, in my view, to be in that category. I do notice that it is often
found on blanks which seem to be loaded (not necessarily reloaded, but rather on
new factory brass) by theatrical weapons suppliers, like Stembridge Arms. I
will have to, when I have time, see if I have this primer loaded into any case other
than Remington. It is possible also that it was used on factory primed brass for
ID (liability) purposes on cases sold to commercial reloaders, rather than to
individual shooter/reloaders. All just thoughts on my part. I have never made much
effort in documenting primers, which is likely a big mistake on my part.
I have no idea what that aluminum case is all about. Surprised it was in with any of
Dave’s stuff. Nothing about it looks like a CCI/Speer factory effort. The thick rim is
reminiscent of the .45 Auto Rim case. Can’t see any reason for its manufacture.
PS" Actually, the character on the primer is shaped like a Zero digit rather than
an “O” and neither Pete nor I are referring to, or confusing it with, the Geco/RWS
Sinoxid primers with a circle (“O”) stamped on the cup.