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Its been a while since I've used any magnum primers for any of my AR loads. My inclination is to ignore the difference as I typically use all primers interchangeably.
Do you typically load down for Magnum primers or do you load with what you normally load?
The batch I am working on now will use TAC under a 77gr SMK. I used 24.5 gr with a standard primer.
If the load is near the top end of pressure/velocity, I'd drop a half grain and test it. Nothing more annoying than loading a bunch of ammo where the primers pop out. Believe me.
Thanks, that is wise advice. This batch will be 100 rounds, so I don't want to pull 100 bullets.Quote:
Originally Posted by markm
I just end up shooting them, but it sucks if a primer gets lodged in the upper.Quote:
Originally Posted by HKGuns
I don't change anything, based on whether the primers are magnum, or standard, for ARs.
For that matter, neither with pistol.
I don't load anything for rifle at max. I do for pistol.
I used 24.2 grains of TAC and CCI 450 primers under Nosler 77 grain CC bullets in LC Brass . This yielded me the best accuracy and 2677 FPS from my 18" barreled 5.56 chambered AR. Quickload says that's a 54,961 PSI load.
I've found that TAC getting a bit squirrely in high heat as often found in NC in August, and I'm transitioning over to VV N140 for more temp stability for my 77 grain loads that are for longish range use.
Won't be able to finalize this N140 load until it gets hotter here, but 24.4 grains of VV N140 looks like the ticket.
I'm relegating TAC to my 62 grain Gold Dot Loads (25.2 grains of TAC) were it's more comfortable, with 50000 PSI loads, as shots with that combo are used for mostly under 200 yd targets.
I try to wring out every bit of velocity I can for long range, so primer swaps can really tip a hot load over the edge.Quote:
Originally Posted by ViniVidivici
With the Garmin Chrono, we are learning way more about our ammo because we can monitor EVERY shot fired out of every barrel if we want.
Is there a way to specify primers in QL? I've never seen that as an option? 24.5 is fairly aggressive so I may back it down to the level you've shot as those are the primers I am now using. (Didn't realize I had bought magnums, but they were in stock and I grabbed them at some point back when prices were reasonable.)Quote:
Originally Posted by BobinNC
HKGuns,Quote:
Originally Posted by HKGuns
Specify primers?? Not that I'm aware of in Quickload.
Ok, thanks, didn't think so.......Quote:
Originally Posted by BobinNC
Military ammunition uses magnum primers to ensure complete and consistent ignition in cold temperatures. They also have thicker cups for pressure containment, while the entire primer is also staked into the primer pocket -- all precautions to prevent failure in automatic fire and in high-temperature climates.
Compare cup thickness between CCI 400s and 450s, Fed 200s and 205Ms, and Rem 6 1/2 and 7 1/2. The "Standard" cups are for rifles like M1 Carbine, while "Magnum" small rifle primers are for .223 and 5.56 through .22 Hornet and 22-250.
https://accurateshooter.net/Blog/calhoonprimers02.png
Thanks Sinister, that is great information that I've not seen before, or don't remember and I've been reloading for over 20 years.
N140 has shot very well for me under the 77 SMK. Even with blems, I was getting well under MOA out of the bolt gun with a 223 chamber.
77 SMK, 24.0 N140, LC brass, Federal 205, 2.270 OAL.
I would move to a CCI450 if I bumped up the charge. With a 24" barrel, there isn't a need to push them hard.