.223 no bang

[ar15barrels]

The 7 that failed still could have been the longest of the batch.

Exactly.
Try screwing the die down another 0.001" or 0.002" for your next test batch and see if the problem goes away.

My trick for knowing how far you are turning a die goes as follows:
Cut a trip of masking tape around 3" long.
Lay a mm ruler next to it and make marks on the tape for every mm.
The fancy version is to buy or print out an adhesive backed mm scale.
Wrap the scale around the 7/8" threads of the die just above the lock nut.
Make a pencil or sharpie mark on the lock nut that points to one of the mm marks.

In use, you count the mm marks that go past the mark on the nut as you are adjusting the die.
Each 1mm mark gives you about 0.001" of die movement.
Depending on your tape thickness, this method is within about 0.002" over a full rotation but you don't need to worry about additive error when you are only looking to make single digit corrections.

[divingin]

Guffey was actually right on this one. Take a fired piece of brass, run it into the sizing die, leave the ram at it's uppermost travel, and use a feeler gauge to see how much space is opened up between the bottom of the die and the shell plate. Assuming you need the full travel to set your shoulder back, lower the ram and adjust your die down by that amount.

Brass that has been fired in a looser chamber or brass that is insufficiently lubed will exacerbate this problem, making a case for trying to be consistent when reloading.

Reloaders don't know this (sorry; couldn't help myself.)

[ar15barrels]

Take a fired piece of brass, run it into the sizing die, leave the ram at it's uppermost travel, and use a feeler gauge to see how much space is opened up between the bottom of the die and the shell plate.

I have posts about this going 15 years back.

[divingin]

I understand that. OP may not though.

I was just pointing out that Guffey posted something that made sense (that time, anyway.)

[edgerly779]

Limp hammer spring. Light strike.

[baih777]

I don't know. I think it's a RRA SS NM LPK. seems heavy but it's really smooth so I'm not sure. RRA NM triggers are my go-to

I have those triggers in 4 of my ARs .
2 in a AR15. And 2 in AR308.
One trigger was nothing but a headache. Light primer strikes. I even tried bending the spring for more tension. Tried stock springs. Nothing worked. Trigger is still sitting on my bench.
Try a stock trigger to test.
Ended up with ALG trigger with JP springs. Set with the red hammer spring.
JP set with yellow hammer spring gave me light primer strikes.

[five.five-six]

I have those triggers in 4 of my ARs .
2 in a AR15. And 2 in AR308.
One trigger was nothing but a headache. Light primer strikes. I even tried bending the spring for more tension. Tried stock springs. Nothing worked. Trigger is still sitting on my bench.
Try a stock trigger to test.
Ended up with ALG trigger with JP springs. Set with the red hammer spring.
JP set with yellow hammer spring gave me light primer strikes.

[MongooseV8]

Those primers dont appear to have been burned at all, the compound is still intact. So you either have bad primers or light strikes.

Sometimes after a light strike you cant set the primer off due to the deformation.

[five.five-six]

Those primers dont appear to have been burned at all, the compound is still intact. So you either have bad primers or light strikes.

Sometimes after a light strike you cant set the primer off due to the deformation.

Right!


Eye protection and a framing hammer?

[ar15barrels]

Sometimes after a light strike you cant set the primer off due to the deformation.

Most of the time.

[ar15barrels]

Eye protection and a framing hammer?

8 shots of jack, half hour break, framing hammer and no eye protection.

[five.five-six]

8 shots of jack, half hour break, framing hammer and no eye protection.

Pfft, I learned that on youtube decades ago

[FLIGHT762]

Pfft, I learned that BEFORE Youtube.

[five.five-six]

so here's my plan

there's still 40 primers in my 550

I bought 1k processed brass from a seller here on calguns spotchecked and they seem almost lose in my Dillon gauge


I'll load 40 with the CCI41's in this new brass and mark them with a red sharpie

then I'll load another 40 with wolf KVB556M and mark them with green sharpie

I'll bring 2 guns out Saturday morning and report my findings.

[quig]

I'm sure it's just an optical illusion, but your primers all look like they are set too deep.

This is my vote as well. Tough by photos, but I think they are pressed in too deep.