Originally Posted by 2alphas
One observation though, Winchesters' LARGE pistol primers box states "For STANDARD or MAGNUM pistol loads". I figure if it didn't matter for the larger bb's (45 ACP), it shouldn't for the 'lil' guys'. Hope this helps.
Actually it's the other way around. The .45 is a relatively low pressure round with quite a bit of leeway when it comes to pressure concerns.
9 mm, .40 cal and 10 mm pose more potential pressure concerns than does the .45. A general rule of thumb is to reduce your loading by 10% when using magnum primers if you're anywhere near max. If you're at or near a starting load magnum primers are really a moot point.
You are correct about Winchester... they stopped marketing separate standard and magnum primers years ago.