Hummm. The Federals are usually pretty reliable
as far as firing. The only issue I see with them
is sometimes a round might seem a tad weak
compared to normal.
I was shooting a brick of the 550 box Federals,
"36 grain hollowpoints", and also the Federal
Champion 40 grain ball not long ago, and I
didn't have a single misfire in 600-700 rounds
or so.
Might look at the pin strike on the rounds that
wouldn't fire and see how they look vs the ones
that did.
To me, it sounds more like a pistol issue, vs
the ammo, being as you had so many misfire.
To me, 31 out of 235 is a pretty high number,
and I haven't had any misfire problems from the
Federal I've been using lately. Not a one in my
10/22. So makes me wonder about your pistol,
firing pin, etc.
If it does it with other brands, I'd take a
look at it. See how it does with some mini-mags.
If they misfire, I'd say something is not right.
I consider those pretty reliable.
Course, I guess you could have got some funky
ammo, but I've had pretty decent luck with the
Federal, so makes me wonder.