Do to recent shortages on Winchester SP primers I switched to S&B SP primers. They have worked fine in 2 different M&P pistols, a Taurus and a SR9c. Hundreds of rounds down range so far and no issues.
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I hear that Sellier & Bellot primers can be harder than most. I looked into this because I was experiencing light hammer strikes in my Kel Tec at the range (first time I shot the gun). I automatically assumed it was my gun, since some work but some didn't. I would have about 2 to 3 light strikes per 7 round mag (pretty frustrating at the time thinking I had to send it in). However, I've ran hundreds of other rounds through my gun since then without experiencing anymore light strikes.
After this, I did some searching on the internet and found a lot of people complaining about the Sellier & Bellot primers with the same issues (in multiple different guns). The general consensus was that their primers are harder than others. However, other people would pipe in and say they have used Sellier & Bellot in a large range of different guns and it has always worked.
My guess is that their primers ARE harder than most other brands, but probably only affects particular firearms. If it works in your guns 100% of the time, then I see no reason not to use them. I just stay away from them in my particular gun. Hope this is useful for you!
This is my understanding as well. I bought 2k spp's anyways, because I don't own any finicky guns. I believe it is only a problem if your gun is cheap basically (i.e Kel Tec, Taurus, Sigma, Jennings, etc).
Thanks. I'm mainly using revolvers and lever guns in these calibers. I would think these guns are more forgiving than semi-autos.