Here's What the Sellier & Bellot Folks Say About Their Stuff:
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"Since 1825, when Luis Sellier started the manufacture of percussion cups in Prague, the Company has undergone a long and successful history. Today it ranks among the most significant engineering companies in the Czech Republic.
The Company deals with the research, development and sale of ammunition and pyrotechnic products, special equipment, tools, gauges, filling and other special machines. Its unusually wide product range includes shotshells, rifle cartridges, pistol and revolver cartridges, rim-fire cartridges, army ammunition, and components. Hunters, competition shooters and other shooting fans, for whom Sellier & Bellot cartridges are a guarantee of quality, accuracy, reliability and safety, will thus also get their money worth.
The world repute of the Sellier & Bellot mark is enhanced by outstanding success of competition shooters who traditionally obtain highest acknowledgements at top world competitions."======================================
The Shooters on the Smith & Wesson Forum (mostly an astute, knowledgeable bunch) generally speak well of S&B primers.
Always a good idea to buy a hunnert of 'em, load 'em up, check 'em out visually, shoot 'em (w/chronograph) and see what-the-heck.
Then if they work OK, buy a full brick.
FWIW--on just about anything under the sun, you can check it out and find Lovers, Haters, and In-Betweeners. Often best to check it out for yourself and your own circumstances to see what works for
You.
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Additional Info:bkoenig posted this commentary on this Forum about S&B cartridge cases/primers earlier this year:
http://nebraskafirearms.org/forum/index.php/topic,10090.0.html===================================================