I'm not sure about most sensitive, but I bought a bunch of Aguila recently, and have found they have really hard primers. The duds almost always fire on second strike, but it is annoying.

 

I suspect that "primer sensitivity" is more a function of the case annealing, the shape of the firing pin, and the strength of the primer hit in rimfires rather that the actual sensitive of the primer. Then you have to take into account the lousy priming of American ammo versus the European priming. One is kind a hit and miss affair, some missing or all missing while European priming is very uniform and I have yet to have a misfire caused by missing priming.

Aquila priming used to tout "Eley Primed". I've pulled several bullets from different lots and always find powder stuck to the primer. I believe that Eley, probably as well with Lapua and RWS, that they prime in air conditioning and keep the cases in that until completely assembled. I suspect that Aqyilla does not and since the priming compound is activated with water, that means it is hydroscopic and oif not kept in low humidity it either doesn't dry out or absorbs some humidity before the powder and bullet is assembled. For some reason, that doesn't sound like a good thing to me????

 

Thank you both for the reply!

I am researching this before I purchase a S&W 317 or 63. Rimfire revolvers, and J frames in particular are notoriously picky eaters. And prone to light strikes.

I am hoping that CCI SV or Federal SV (714) will run ok. I don't plan to shoot any bulk ammo.

 

cci sv will run with lighter strikes.
aguila won't.

 

And some ammo, I won't mention any names Remington, won't go off no matter how hard you hit it due to a lack of priming compound in the rim.
I agree that in modern mainstream .22LR, Aguila is the only one I know of that needs a harder hit than the others.

 

If Aquila is difficult to "go bang" it isn't because the primer is "less sensitive" but due to the brass hardness. The type of priming they use is the same as Eley, Lapua and RWS usein their high end ammo. Maybe not as well done but still it shouldn't be any less prone to igniting 'unless' they don't have as much ground glass in their mix which I doubt.

Both my self and my buddy have shot Aquila Rifle Match and although it does not shoot to our expectations, we've never had a miss fire. But both of us are shooting rifles that have good primer strikes and my firing pin has been reshaped to make it more efficient and better ignition. It will ignite anything unless the primer is missing.

 

The Aguila always seems to go off with a second hit in the same place, so I believe you're correct about tougher brass.

 

here's what i know for sure.
i picked up a case of aguila sv, before i knew
it wasn't accurate enow for me.
i decided to use it up in my single 10, which isn't all that accurate anyway.
my single 10 had light springs that i find pleasant.
everything else works with these springs.
but i got 3 out of 10 FTF with every brick i tested.
i had to replace the factory springs to get this stuff to work.
it does work with factory springs, but it's irritating not to be able to use the springs i prefer.

 

The real solution is easy; just hop on down to your local five and dime and buy a Freedom Arms Model 97 with dual firing pins at 180° offsets. If any round doesn't fire, it's safe to say you need to stop buying that brand ammo.
gkn

 

I'm not sure about RWS, never pulled any but on another thread some said they did use the dry priming method.

This what my firing pin strikes looked like before re shaping and after.

 

Available (or) lack of room in those rims?

Compared to Eley the Mexican ammo looks a lot on the tight side?

Doesn't look all that good for the amount of primer that gets pinched?

Maximize this picture for the best view.

 

This brittle priming compound talk got me thinking what if some of the cases of ammo get dropped a few feet, tossed and bounced around during handling, you know, like UPS has a habit of doing with boxes marked fragile?