I came across a good deal on 10k #41 primers they say for 5.56, was wondering if anyone had used them in anything other than an AR or 5.56
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Wrong forum. There is a specific Reloading & Ammunition forum for questions like this.
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I’ve done half of that. Used them in subsonic 300 blackout. Ar platform.
They seat well, even in crimped brass, and all 1000 fired. No probs here. I would still choose #400 primers if side by side, oy because ive used those more. But I wouldn’t turn them down either, esp if they were given to me or a good deal.
From what I know the #41 primers have a thicker cup. If your rifle has a strong ignition setup they should be fine. I recently bought some from the LGS for $39/1K
Did not have problem igniting them with JP Enterprises Trigger Spring Kit Reduced Power on the 200 primers I had.
In my chrono testing of near max loads of H335 (25gr), H322 (23.5gr) and TAC (26gr) with 55gr Hornady FMJBT bullets CCI#41 primers consistently gave 80-100fps higher velocities than Wolf SRM, Win SMR (old chrome ones) and Rem 7 1/2. The best SD and ES were with The Wolf primers.
I am not recommending these loads they are just what I ended up with after working up from about 1-2gr less powder. They showed no pressure signs in five NATO chambered AR rifles even with the CCI #41s. Velocity was in the 2800-2950 fps range from 16" barrels.
I like the #41s with H335 but I prefer the Wolf SRM or Rem 7 1/2s with H322 and TAC with the 55gr bullet.
Correct. Also the CCI #550 is the same exact primer as the CCI #400. CCI just packages it in a different label. Easier to do that than explain why they labeled it as “small pistol magnum or standard small rifle”.
Keep in mind that these are magnum primers when working with established loads.
Yes.
From CCI:
Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a “slam-fire” can occur before the bolt locks. The military arsenals accomplish this using different techniques and components—including different primer sensitivity specifications—from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*. If you’re reloading for a military semi-auto, look to CCI Military primers.
*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential.Mil-spec sensitivity
Initiator mix optimized for ball/spherical propellants
Available in large (No.34) and small (No. 41) rifle
Use the same data as CCI Magnum primers
I ran into this early this year after working up hot loads last summer with #400 primers. All I had left was #41 and realized no load had been worked up with those.
Shot off an email to ask the differences rather than relying on speculation. Straight from the horses mouth:
Ted, the #41 primers are a magnum primer, the 400 are standard primers. There is also differences in the makeup of the primer itself. They are not interchangeable
I am going with 300 Blackout and Barnes X 110gr. So it sounds like I have a lot of work ahead of me before November gets here.
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I ave used small rifle primers 4000 so far in all of my pistols and revolvers , The guns are all stock. I have used CCI. Federal and Winchester and they all fired and actually seemed to work well. The CCI #41 will not fire in any of my pistols or revolvers. Load a few rounds with the #41 primer only and see if they go bang in your rifle.
Like mentioned, they’ve got a thicker cup and therefore more slamfire resistant apparently. Alot of guys who reload 6.8SPC use them consistently
The #41 and #34 have the same thickness and hardness cups as their magnum primers counterparts. The difference is the anvil is shorter than standard primers requiring more force to set the primer off.
On the M14 and M16 rifles when a single round is loaded without the magazine in place, bolt velocity is higher and the floating firing pin can set off the cartridge with standard primers.
My LGS has #41 primers at $50/1k…:eek:
How much tougher are they than regular primers? I bought a K in preparation for my making some mk262 ammo with some 77gr nosler custom competitions to chunk out of my 20" barrel. I know these loads are going to need to be pretty hot and it seems people have better luck with these and hotter loads. Just don’t want to get too hot of a load and blow something up.
The #41 and #34 primers are mil-spec primers, all commercial contract military ammunition must meet these requirements.
Guess what primers are used to load this ammunition.
You also have people here saying they use CCI 400 primers in their AR15 rifles and they have thinner cups and are more likely to have slam fires due to there thinner cups. (Very bad idea with rifles with free floating firing pins)
CHOOSING THE RIGHT PRIMER - A PRIMER ON PRIMERS
http://www.sksboards.com/smf/index.php?topic=56422.0
I have used them in a 300 Blackout AR. I recorded no appreciable difference in group size, velocity, or pressure signs from CCI 450.
I’ve loaded and fired a couple hundred thousand rounds (~200-250K) with #400 primers and never had a slam fire. If it was that bad of an idea, I would have expected it to have happened already.
I would expect the military did more extensive testing than what you claim you did and the military laid out the milspec requirements for primers. If you want to use primer with the thinnest cup and increased sensitivity go ahead BUT you may want to a little research on the subject before bragging about it.