@Old Sea Dragon I had issues like that with my CZ pistols. After investigating my primers were not 100% seated all the way and would move during the firing pin strike thereby negating the round going off and giving a light strike. Made an adjustment to the 1050 and issues resolved. And you may be well aware of this, make sure your primers are seated all the way, not necessarily flush. A few may have squeaked by as it was with me.
Some good primer info here: disregard the error name in link, it works.

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Yeah, definitely a possibility. I will play with seating depth. They should seat slightly below flush. Pain that this Colt is more sensitive to this than my Smiths and Rugers. I will load a batch after thoroughly cleaning primer pockets.

 

CCI primers are indeed "hard". But a stock gun should fire them, if well seated.
If.

 

Yep. They’re the hardest that I’ve run across.

 

I've had light strikes loading 454 with cci srp. Switched to federal srp to load the casull for the past few years and haven't had a single light strike since.

 

Federal primers, small and large rifle, are known to have thin cups and pierce easy in rifles. I'd think any hammer fired gun could handle rifle primers if the main spring was good.

 

Fortunately I have primers, unfortunately they are all CCI. Another member suggested extra power springs but it does not seem Wolff or Springco make them. Brownells yielded zip also

 

BH Spring Solutions Browning Hi-Power, 1911, CZ75, Makarov Home (bhspringsolutions.com)

 

I've heard of hard cci primers, but I've used them for years and noticed nothing. Most of my firearms utilize stock spec springs. Primers should be deeper than flush, but I bet you know that. At any rate, I hope you get it sorted, sucks 2 trips to mothership already. Frustrating, at least

 

CCI primers are definitely harder than Federal. But they're not so hard that any working firearm shouldn't work with them. I personally prefer CCI simply because they seem to feed the most reliably in my reloading press.

If you want to see if it's the gun or the ammo, buy some CCI Blazer Brass or S&B loaded ammo. They use harder primers but should still fire in your gun. If they don't fire reliably, you have a firearm problem. If they do, then you have a reload problem.

As others mentioned, not seating the primer deep enough could definitely cause problems. It's happened to me. I also prefer to decap spent brass before cleaning to let the primer pockets get good and clean too. That's likely overly OCD on my part.

Good luck and let us know how it all works out.

 

A friend has some S and B and I bought some Norma to try tomorrow . Thanks. This batch of reloads has run fine in my Smith model 66

 

I had an issue with my Charter Arms Bulldog & light primer strikes. Probably CCI, but could have been Win. I replace the hammer spring with a new factory one and all was well. Tried a Wolff extra power spring and it made the trigger pull horrible. I’m not sure if Colt is using a spring or leaf style, but a new one may solve your problem?

 

I was speaking with a friend about 454 reloads using CCI rifle primers that the gun won't set off. It turned out in this instance to be the hard primers. I suggested use of factory loads for his bear ammo. You don't want click to be the last thing you'll hear in a bear attack

 

i’ve had problems with cci primers in factory guns. they are hard. switched to federals and never had another problem.

 

I believe that Federals are the softest, then Winchester. I don’t know where Remingtons fall.

That said; I’ve never had problems with CCI primers in guns with standard rate mainsprings (hammer springs) or standard rate striker springs.

 

Has the Colt been tuned for a lighter DA trigger pull? That usually includes replacing the mainspring with a lighter one.

Do the King Cobras retain the leaf mainspring like the new Pythons?

My original Cobra (snubbie) of course has a leaf mainspring.

 

it is a leaf mainspring similar to the new Python and factory stock.

 

There’s a YouTube video of a guy having these same issues with a new Cobra. Might be worth checking out

 

They are only 'overly hard' if your heater does not pop them.

 

I don’t know about hard to get a good strike on the primers. Sounds like a firing pin.. but I will say,, CCI primers in my experience invert more than Winchester, Remington, or Federal.. loading 38’s with cci I get 5-10 inverted primers.. SO,, I don’t buy CCI PRIMERS anymore.. try Federal or Remington. Mite work better.

 

I fired 100 rounds of Norma factory without incident so it looks like I am occasionally not seating the primers deep enough. I will be exploring that the next time I load 38. Probably I will start depriming as a separate step before I clean the cases. I will make sure the pockets are very clean. I will also shoot a little more factory ammunition through this to insure that the good luck continues.

 

That’s OK. They’ll work fine for me regardless.

 

I prefer CCI primers.

 

Pistol yes, Rifle? Depends on the rifle. M1s shoot the best with Winchester.

 

So I let this project simmer on the back burner a bit but recently deprimed 150 mixed headstamp’d cases, cleaned them, and then brushed the primer pockets. After consulting the Dillon 550 guide I set the shellplate a bit tighter than I might normally and loaded them up with 158 grain unknown brand semi wadcutters over a near max charge of Bullseye. All 150 fired without any light primer strikes or misfires so I think the extra steps are the cure for the issues I had. Some of this brass I use could be 30 years old and I do not count how many times it has been reloaded. The target was shot double action at seven yards, and has a 5/8” bullseye. I am pleased with the results. Recoil out of this gun was mild.

 

the cci primers are indeed harder than the likes of federal. 3 or 4 years ago i got 20,000 cci small pistol primers. i shot about half of them and still have the other half. it didn’t matter what gun i shot them in, including my glocks, the cci primers wouldn’t go off sometimes where the federal and remmys would every time. i expressed my unhappiness with one of the good folks at powder valley and they said i wasn’t the only person that had that problem. this problem was not limited to any specific lot number. so i went federal and haven’t looked back.

 

The weird part is I tend to do 1000 round batches of pistol rounds and the ones giving the Colt fits function fine in my Smith’s and Rugers. It is what it is I guess