http://www.meisterbullets.comI see an 85 grain bullet listed there, it is a plain base, no gas check.
Being a bottle necked case, I'm pretty sure you'd have to buy
a Lyman "M" die to flare the case mouths before seating the
lead bullets. Unless you can seat them without shaving lead
by simply inside chamfering the mouths with a hand tool for that purpose.
Dies for bottle necked cases don't usually come with an expander die
for the mouth like straight cased die sets do.
You'll have to look around on line for a source of gas checked bullets,
unless somebody else has more info on that.
Don't forget to use a light crimp also, since the rounds will be
used in a tubular magazine.
According to the #48 Lyman manual, several pistol powders might work
ok for you in the .25-20 also.