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Subsonic 223 reloading data8/3/2023 ![]() ![]() I have found weight and capacity to be basically the same between the two, contrary to what you will read online. I talked with one case manufacturer about the differences between their 223 and 5.56 cases: only an additional annealing for 5.56. One of the best sources for load data is Hodgdon’s online Reloading Data Center:Ĭases are for the most part interchangeable between 223 and 5.56. Specifically, in the Hornady Handbook of Cartridge Reloading, there are three sections for relevant load data: Both cartridges were designed/optimized for 55 grain bulletsĢ23 Remington and 5.56 ammunition is almost identical in many cases, but there can be a slight difference between the two when it comes to load data.Same external case dimensions (shoulder transition may have different radius).Here are some similarities between .223 Remington and 5.56 NATO Ammunition: Dimensionally, these cartridges are essentially identical on the exterior with the exception of some bullet profiles used for 5.56 NATO ammunition. 5.56 ammunition will have a cannelured and crimped bullet, where 223 Remington ammunition may or may not have a cannelure or crimp. There may be other differences externally as well. Here’s a side by side comparison of the case rims for 223 Remington and 5.56 NATO: (click/tap to enlarge) On the case rim, you’ll notice that 5.56 military ammunition will have a crimp around the primer pocket (not the case for new 5.56 cases hand loaded in the civilian market).On the case rim, you’ll notice “223” stamped on 223 Remington brass, where 5.56 NATO brass may only have a date, initials (Ex: FC) and one or more symbols.There are some differences you’ll notice right off the bat between. It's just plain neat to shoot something even quieter than an air rifle, but with way more power.Here’s an excerpt from my 223 -vs- 5.56 Deep-Dive: Plus, I had everything, just took stuff that I wasn't using off of the shelf.Īnd yes, there is the "cool" factor as well. The load uses a primer and 2.0 gr of green dot, brass lasts forever. Expense? I don't remember what I paid for surplus and blem 33 gr V-Max bullets, but they were very inexpensive. Besides, my load is much more accurate than any. Yes, it can be cheaper to shoot, but not in my sealed can designed for 5.56 Nato.22lr but rarely through the can, the subsonic centerfire fire is for shooting vermin through the can. Maybe as a trainer that's why my dealer wants it? I dunno, I didn't ask.Ībout. Suppressed subsonic requires no hearing protection whatsoever. I'm guessing supersonic ammo is no good for the hearing after firing lots of it- heck, supersonic is still plenty loud. My bet is that it can't be solved unless the gun is modified, or has an adjustable gas port. To recap, I asked for another individual, but I find it an interesting problem and was wondering if anyone has solved it yet. I'm saying that I have no need of a load that cycles the action. If I ever had to drop game silently, so as not to give away position it doesn't need to function the rifle IMHO. Myself, If I have to shoot "other" vermin with the AR-15 I want supersonic ammo so that their buddies don't know where I am. The third thing he did was say," I'll never hear you exterminating red squirrels anymore.". The second thing he did was ask, "What the hell just happened?". I've been working on it on and off for about 15 years now.īTW, when my neighbor experienced the sub sonic load, the first thing he did was paste a big s-t eating grin on his face. Personally though, I find it an interesting problem in reloading and I'm an experimenter, that was another reason I asked the question- curiousity. For the AR-15, well, if you read the initial post, I was asking for my dealer, he's in LE (and a trainer) and I didn't ask why he wants it. I don't like bothering the neighbors when dispatching vermin, hence the Contender subsonic load, and I value what's left of my hearing. ![]()
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