With the primer shortage going on around the country I find my self without (standard) small rifle or small pistol primers. However I do have small pistol (magnum) primers. My pet load for my Ruger No.3 22 Hornet was with H-110 and(standard) small pistol primers. Are the magnum small pistol primer an option?

I doubt you, a chronograph, or a strain gauge would notice any difference.

I've used both in my Hornets, as far as I can tell, they are pretty much interchangable.

A chronograph and/or a strain gauge will in fact tell the difference. I have both and have chronographed and pressure tested numerous .22H rounds with different primers including the above with H110. With the higher brsance primer the ES is usually larger with a corresponding increase in average velocity and pressure with a given powder charge. For example; with a Sierra .224 40 gr Hornet bullet over 12.5 gr H110 the velocity runs 2852 fps with a psi(M43) of 30,700 when a WSP primer is used. When a CCI 450, 7 1/2 or WSR is used the velocity runs 2937 fps with 33,800 psi(M43). That last load is to much for the WW cases as after several firings the primer pockets are enlarged. It, of course, is not too much pressure for the #3 Ruger (test rifle).

My advise is, if those are the only primers you have is to dorp back and rework up the load so that the velocity average equals what it was with pistol primers.

Larry Gibson

My best accuracy has been with the CCi 550, small pistol magnum primers when matched with LiL Gun and 35 or 40 grain bullets.

Larry's posting above is right on!
My pet load for a Ruger 77 Hornet is 10.2 grains of H-110, 45 grain Sierra Hornet bullets and Federal small pistol primers. The bullets are crimped too. That is by no means a max load, but the most accurate one.
If I had the small pistol magnum primers, I would use them and drop back a grain of the H-110 and work up to find the sweet spot in your rifle.

Don