![]() ![]() I had some 300 blackout brass, but I also knew how to convert 223 brass to 300 blk. I bought a 300 blackout gun at the start of the covid-19 pandemic but couldn’t find ammo, so I knew I’d have to reload it. He used Lee, I learned with Lee, I tried to stick with Lee. Lee is basic, and less expensive than a lot of other options, but that’s what my mentor had taught me on. Separating Bullet Seating from CrimpĪll my other dies are Lee dies. At this point I wasn’t even suspecting the projectiles themselves. I needed to separate the seating from the crimp. I didn’t want the bullets to get seated too deep when loading and have a catastrophic failure from too much pressure. I really needed the crimp though, as I was going to be shooting it out of an AR platform. I was able to finally start getting bullets to seat reasonably consistently, but without a crimp. It seems like an uncommon problem, but the variation I had had with the 125 gr bullets had made me lose faith in the RCBS dies. I did some research and it said that the bullet profile could cause troubles with this brand of die. It was about a full half inch above where it has been, but some bullets kept getting seated deeper, and I could see the markings on the lead projectiles. ![]() I figured this out by unscrewing the bullet depth seater all the way up. I figured that the crimp was catching the bullets and pushing them in further. ![]() Also, neither of these was the desired OAL I was trying to get. ![]() As can be seen below, the difference was about an 1/8″. The trouble was, the overall length was different for every single one, noticeably different. I was using RCBS dies, and I was having trouble getting the 300 blackout projectiles to seat even close consistently. The 217 grain projectiles were even more of an issue. From my experience and research, this is the list for what you should check if your bullets are not seating consistently- Trouble Seating Heavier 30 cal. The variation in the bullet seating was within a few thousandths of an inch, so it wasn’t crazy, and the variation wasn’t enough to notice until I threw the calipers on it, but I hadn’t ever gotten any variation in my other dies. It was important that I had that wiggle room because as I went back to check, there was some variation in the bullets made from these RCBS dies. According to my reloading handbook, that was just fine, and it gave me a little wiggle room to be a little high or a little low. The 125 grain projectiles I had tried first had worked ok, but those I was seating at 2.080″ OAL which is far below the maximum OAL, and above the minimum OAL with some wiggle room. I was trying to reload 300 blackout with 217 grain projectiles. I didn’t have any trouble until I tried reloading heavier grain bullets. I was having trouble getting the 300 blackout bullets to seat consistently with my RCBS dies. The first time I attempted to load the 300 blk subsonic though I had problems. In terms of reloading, I also love that it is a 30 caliber round, which I reload for other cartridges, and it can be loaded subsonic. It’s a fun, lower velocity round that can really pack a punch. I’m a huge fan of the 300 Blackout round. If you’re having trouble with RCBS or Hornady 300 blackout dies not seating bullets consistently, this should help. ![]()
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