Tell me about this graph. What program was used to generate it? What are the parameters?
QuickLoad with H110 powder and a 110 grain bullet, set to 55,000 psi.
I can really appreciate this kind of rationale.
You are making my wallet hurt.
ETA: Have you guys shot this 115 grain UMC round in some ballistics gel? With the open air pocket it seems it would yaw reliably much like the Soviet 5.45 is supposed to.
We did not gel test it. So someone can be the first to do that.
I hope it breaks apart more reliably than the Russian round, though. Yawing is good but it needs the fragmentation to make that temporary cavity more permanent.
-B
I’ve already convinced a buddy to buy an AAC 300 BLK upper, and its going to be the next upper I buy as well.
But $13 a box is still out of my price range for serious social work. I know its not 5.56 and it will eventually come down but for right now $650/1000 rounds is too much.
Is reloading worth it? From a cost standpoint, I’m not concerned with precision out of a 9" barrel. Consider I will have to buy a press, powder, cases, bullets, etc.
I really like this cartridge and that is the only thing holding me back. I even bought an AAC 762SD because I knew by the time my can is approved I’ll have the upper for it.
The UMC ammo will drive the ammo made from reformed brass down to $8-9 a box.
Off topic, but would you feel comfortable shooting 300BLK through a 762SD out of a 9" barrel?
Would using subsonic ammo lessen the blast the can receives to a point where wear is not an issue?
Yes, 9 inch is fine.
Subsonic should erode less.
How many bad guys do you need to shoot? 
I think the beauty of this (and 6.8 SPC would work almost the same) is that you can practice your skills and test most of your equipment (lower half, at least) with cheaper 5.56 ammo, then switch to the more effective 300BLK for “social work.” You still need some practice with 300BLK to break in and test the upper and ensure complete familiarity, but you don’t need cases and cases and cases if your platform is the same as a 5.56 you practice with.
For someone who already owns the reloading equipment and is ignoring the cost of dies (only about $30 anyway), I calculated that I could do cheap practice ammo (147gr FMJ) for 30 cents/rd and nicer quality ammo (125gr Sierra OTM) for 45 cents/rd. Some people could reload for a bit less still using cheaper bullets or buying in huge quantities or whatever. In comparison I can reload .223 for 20 cents/rd and don’t usually bother as long as factory ammo is 28-32 cents/rd.
There are 10 cents a case BLK cases now, if you don’t mind improper headstamps and made from once-fired brass. The fact that it can be made from free-range pickup 223 or 5.56mm brass ensures it will never go away.
Will these feed from a PMAG, or USGI only?
Most of AAC’s promotion has shown 30rd Pmags in use.
I have personally been using 30rd Pmags and 30rd Troy CBIR mags with my 300BLK upper with no feeding problems. However, I’ve done very limited testing so far.
All I’ve read is that 300BLK should feed from any conventional 5 to 30rd AR15 magazine as long as the bullet is seated so that the bullet diameter is below a certain diameter where it contacts the magazine rib. Apparently the round doesn’t feed reliably in the Surefire 60 and 100rd mags or in Beta-C mags.
Has anybody tried the HK ar15 mag with 300 blackout ?
My handloaded 300 BLK run fine in my HK mags. Bullet design limits OAL(where the bullet rides the rib), so I can’t use the longer OAL length the mag offers.
AAC is working with many bullet makers, and some projectiles in the future might be able to use the extra OAL the HK has, and we will see velocity improvement. With the Blackout still being New to the public at large, the tinker’ers haven’t had time to ring out the load development, the best loads are yet to come!!
Yes these UMC loads use a custom “long pointy” bullet.
I was wondering if these feed fine in a PMAG, which has the rib further back.
updated timeline on the UMC release? 
I know the ammo is in stock at Remington now. What I don’t know is if they ship on Saturday, and if they are even open on Monday. But that fact that it is now made and exists is 99% of the battle. If it does not ship on Monday, it will ship the day they reopen.