All the manuals I have read say to use mag primers with H110. So I do.

Oddly, some manuals call for mag primers with 2400 and some do not. I think I even read somewhere NEVER to use mag primers with 2400 due to pressure issues.

And some people say that mag primers are OK in 9mm and .40 as long as the charge is on the low side. I've done that with no issues.