You are right, the Dillon trimmer is not designed to hog off that much material - it gets hot and burns up. Matter of fact, due to heat, it is a bit marginal even for regular trimming. A friend of mine owns a small ammo manufacturing concern and went through a dozen of them in short order. He ended up installing two of the trimmers and taking a half-bite with each one. Then we piped clean instrument air into both motors to keep the temp down. That worked pretty good, but he has since gone to a custom rig using a different (larger HP) motor and hasn't experienced any further problems.

I have air & vacuum on mine and I try to keep the cycle speed reasonable. For now.

I have enough brass on hand now that I won't "need" it any time soon, other than to satisfy my curiosity.

I would like to get some factory 300Blk brass and see how it works neck wise in my 300W.

I had an AR upper once… almost twice. lol I found it rather boring to shoot, expensive compared to .223, so I sold it fairly quickly.
Next upper was a .50 Beowulf so so much for "expensive compared to…"

I think they'd make a heck of a weapon though.

The only hitch to me is the ribs in the standard AR magazine. They can be removed, but hopefully someone will make a dedicated 300BLK mag eventually. That will clear up feeding issues with a LOT of appropriate bullets.

One day, will have an SBR and take-apart can to shoot cast subsonics.

I LIKE IT!

My brother in law took a couple deer and a russian boar with his (the only 300 barrel I own now, his 10" SSK barrel).

I believe the first deer was with a Sierra 130gr SSPB (single shot pistol bullet) though it worked and the deer went right down, we weren't thrilled with the expansion at such close range, about 30 feet. The other note on this deer was once it was down and kicking he hit it in the middle of the sternum (so basically shot from "underneath" anatomically) with a 220 grain Sierra Match King. The bullet went in caliber size, turned and made 2" wide wound through the heart as it tumbled.

Second deer was shot with a 125 ge Noslar ballistic tip. Bullet wasn't recovered but it drop at the shot about 35-40 yards away.

The boar was 200-250lb? 50-60 yards away with 150gr Noslar ballistic tip. When hit it rolled right over and was done.

(I then shot one with my 500 Linebaugh. 465 gr SWC @ 1350, right through the boiler room and it ran away like I'd missed. I guess he hadn't read all the magazines. ;) )

I will caution that a 223 upper will chamber a 300BLK. We keep our 300BLK stuff separated. I keep the 300 rifle broken down in a takedown case.

Now, it is a "rip-off" in the same way that the .375 JDJ is a "rip-off" of Ken Waters' .375 Express.

THAT is what the AAC people are claiming, that that was the problem and that they standardized the industry.
My comment to them was, that's what the guy before them thought too until you came along. And that's what the next guy can say as well.

SAAMI, marketing and the "black rifle crowd" have made it a success, at least for now. But the misconception of many is quite amazing. It's funny to read what some people expect from the round, thinking it's somehow a .308Win or better class cartridge, or built for long range.