Stop in for a cup of coffee

Sublime one said

I was one of the early supporters of Dillion reloading equipment. Not because of any science or intelligence I was simply a young competitive shooter and could not afford anything else. They had/do have great customer service. My first Blue press the head was not removable and you had to spin the RCBS lock rings on your lathe to get them to fit with each other. Changeovers were a total PITA, circa 79 maybe? Wish I still had that press, it was cutting edge at the time, very innovative.

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I don't know if I'd ever get into it or not. Only so many things a person can do. Never mind do well.
I do pay attention because sometimes they compare with commercial and also to understand the mechanics.

Also because the carbine development was done a bit on the fly, there was a change in ammo early in production. It involved a very slight change in the case taper and an increase in velocity. Unfortunately the full details are not really accessible as you would think. Even simple things like velocity distance from muzzle. It looks like the Army may have been measuring out at 50' not close in as one might expect.

Right now there are five threads about reloading on the Carbine Collector forum page.
Safety/ Accuracy/Shooting/Ammunition/Care and Maintenance - The Carbine Collector's Club - Page 1

And over in CMP forum, there is a long thread bookmarked that people still add to. CMP Help: Stock Cleaning, Ammo, Mag ID & Accuracy - Page 3 - CMP Forums

Considering the limited range of allowances available for this cartridge, one would have thought this was all very cut and dry. Clearly not!