Dairt "Reising SMG ammo"

[Bruce Canfield]

I acquired to box of ammunition years ago as I thought it would go nicely with my Reisings. I've always wondered what made the ammunition "specially adapted" for the Reising. The box contained various .45 ACP military ball cartridges dated from 1941-1943 (mostly FA and WCC) so I don't have any of the original head-stamps to go by. I assume it's commercial ammo but can't find out anything about the Dairt Co. Any ideas?

[StrangeRanger]

A quick search gave me this but nothing about the basis for the Reising-specific claim

https://www.oldammo.com/march12.htm

[inertord]

Bottom of Reising FAQ Section: http://www.machinegunboards.com/forums/index.php?showtopic=9688&do=findComment&comment=82789

[inertord]

Also some interesting info related to an FBI Investigation of Dairt Co: https://forum.cartridgecollectors.org/t/dairt-oilite-45-ammunition/2922

[Bruce Canfield]

A quick search gave me this but nothing about the basis for the Reising-specific claim

https://www.oldammo.com/march12.htm

Very interesting. The cartridges listed in the article are exactly what is currently in the box. I always assumed someone had just put them in as a filler and didn't realize the company sold reloaded military cartridge cases. Great info. Thanks.

[Bruce Canfield]

Bottom of Reising FAQ Section: http://www.machinegunboards.com/forums/index.php?showtopic=9688&do=findComment&comment=82789

I hadn't seen that. Thanks.

[Bruce Canfield]

Also some interesting info related to an FBI Investigation of Dairt Co: https://forum.cartridgecollectors.org/t/dairt-oilite-45-ammunition/2922

Fascinating info.

[StrangeRanger]

https://forum.cartridgecollectors.org/t/dairt-oilite-45-ammunition/2922

This may explain the Reising-specific part. I mentions that the Oilite bullets are almost 100 grains lighter than the standard military ball. Several of us have played around with bullseye pistol loads of 185 grain bullets in our Reisings and have found that they run substantially slower (more than 100 RPM less) and have noticeably less muzzle rise. A 135-140 grain bullet would be even better with the proviso that it would have to be driven a bit faster to cycle the action reliably

Edited December 26, 2021 by StrangeRanger

[Bruce Canfield]

https://forum.cartridgecollectors.org/t/dairt-oilite-45-ammunition/2922

This may explain the Reising-specific part. I mentions that the Oilite bullets are almost 100 grains lighter than the standard military ball. Several of us have played around with bullseye pistol loads of 185 grain bullets in our Reisings and have found that they run substantially slower (more than 100 RPM less) and have noticeably less muzzle rise. A 135-140 grain bullet would be even better with the proviso that it would have to be driven a bit faster to cycle the action reliably

That makes sense. I couldn't figure out what would make the cartridges "specially adapted." for the Reising SMG.

Edited December 27, 2021 by Bruce Canfield

[StrangeRanger]

FWIW this:

https://fedarm.com/product/45-acp-150-grain-lead-free-solid-alloy/

...seems to be pretty similar in concept if not in chemistry.