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New to 222, some initial questions, suggestions

I was able to score an 8 pound jug of IMR 4198, but have not tried any loads with it yet, through a local Facebook listing, amazingly enough. The weather here in Central Oregon is turning to winter fast, so probably the end of load development for now. Just when it was starting to get interesting too!

Yesterday I was shooting a ladder test with 50 Vmax, N133 and Rem 7 1/2 primers. When I got to my last test load I had a weird thing happen, the trigger broke, I heard a click, no boom. I checked the round, the primer had a strike, but I thought, maybe my first primer dud! Put it back in the chamber, click, no boom. Put in the second round, click, no boom, same thing.

222 Primer Strike.jpg
This photo is of the tops of two fired cases of the last 12 that went off without a hitch. The two on the right are the duds. They were all primed and loaded at the same time, should be no difference in specs.

I assume the 1957 Sake 222 had the original firing pin spring, maybe it just ended it's usable life cycle. I was getting colder as I was shooting, from about 48 degrees down to about 38, might have had some effect on the spring?
I found and ordered a couple replacement springs from Wolff, one for this rifle, and a spare for my 1954 Sako in 20 Vartarg, just in case. Never had this happen before, but these are both the oldest rifles I've ever owned as well. Any input as to the likelihood of it being the striker spring, or maybe some other possible things to check?
 

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