A 'What Is It' question?

[Potashminer]

I finally broke down and ordered a number of "correct" shell holders for various re-loading die sets, instead of having to find the correct one from a different die set. Many of my re-sizing die sets came to me used - some with shell holders, some without. So a mix of Bonanza, Lyman, RCBS, Lee, etc.
For several years, I have been loading 9.3x62. I think the shell holder below, marked "10", might have come with that RCBS die set - I do not remember - it appears to work fine for that size case head. The RCBS 9.3x62 box says I want an RCBS #3 shell holder, so I have now got one - on the left in the picture. I can not find any maker's ID on the shell holder marked "10" - on the right in the picture - that would be so close to the correct size as RCBS #3 (very common size - 22-250 through the 9.3x62, and more I am sure).

So can anyone identify what maker of shell holder on the right?? The one marked "10" - it has a curved "lip" towards the front, if that helps to identify the maker - there are no markings on it at all, other than that "10" - not on the rim, underneath, etc.

 

[4n2t0]

Wrong guess...

 

[Maple57]

It might be part of a set to help control headspace.

Some shell holders are made thicker in increments of 0.002" so you can screw the die down to make full contact with the shell holder instead of floating it and using a shim gage.

If you measure from the top to the surface that touches the base of the case, you can see if I'm right.

 

[horseman2]

An internet check on the Internet produced the following:

Hornady - 40/10mm and 357 Sig

Lee - 225 Winchester, 220 swift and 220 Wilson Arrow

Lyman, RCBS and Redding - 223 family.

 

[Potashminer]

Horseman - thanks for checking - I failed to mention I had done similar. But I did not follow up. So, from Hornady 9th Manual, looks like the 375 SIG and others have smaller rim diameter, so eliminates that one - clearly larger than for 223 so that eliminates Lyman, RCBS and Redding. So pretty much leaves that Lee - and I was surprised to see that the 225 Win, 220 Swift rim is same diameter, same thickness rim as the 8x57 / 30-06, etc. Could not find a spec on that 220 Wilson Arrow, but I will go with "Lee" as the best candidate for the maker. I find it odd that two different designations would be used, though - Lee #2 is for their 8x57, etc. Just compared Lee #2 to this #10 - it is the angle that the case body requires that is different - this #10 has a wider "slope", as if for a "fatter" case head or a "flatter angle" on the forward edge of the rim cut?? Which is odder, because pictures of those two cartridges show them to at least "semi-rimmed", if not outright "rimmed" design.

 

[B]

Yes, it's a Lee shellholder.

 

[Hitzy]

I think I use a #10 for my 7x64....