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Old 05-04-2018, 01:46 AM
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colt_saa colt_saa is offline
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I can't see 10MM AR happening

41 Special, 45 Cowboy or 500 Special are easy since loading dies already exist that will work for them. It is very cheap for a handloader to add any of these to his lineup after all they are simply shorter versions of cartridges already in the production

A 10MM AR is MUCH harder to get off the ground

You would require a new shell holder for single stage presses. That is not too hard since one manufacturers product would fit all single stage presses. Getting one manufacturer to produce some would be pretty easy.

To sell the brass in quantity, you need to attract folks that shoot enough that they would use the faster progressive presses. Here you need new shell plates for those progressive loaders and every manufacturer uses a different plate.

It will be very hard to convince manufacturers to make 10MM AR plates. Or it will be very expensive to have one custom made for your press

Then depending on which dies you are using, most likely the crimping die would need to be replaced. Yes, you could take your crimping die to a grinding wheel and shorten it yourself but most folks won't.

The sizing die will also have to be redesigned to get all the way down to sit against that auto rim. In 40S&W, 10MM Auto and 10MM Magnum we do not have to size all the way down, we just size down to the extractor groove. This is a non-issue with 45AR since there is enough case web there to contain this low pressure cartridge.

OK you could strengthen the 10MM AR case web to handle 37,500+ psi and not need a new sizer. However now you have reduced the case capacity, so 10MM Auto loading data is no longer valid for this cartridge.
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