Every year we pick a bunch of wild black raspberries and make jelly. It
isn't really jelly because most of the pulp is in it, but we get rid of the
seeds. Wild black raspberries have small seeds and many of them pass thru
the finest screen of our Moulinex sieve thingy (they also pass thru the cone
of our juicer which resembles a meat grinder), so we end up using a jelly
bag to strain the output of the Moulinex. The jellybag plugs up on the pulp
(wild raspberries have a lot of pulp too), so we squeeze it to get more
stuff thru. This is a real pain.

What would work better as a means of separating seeds from the juice and
pulp? We really don't want the seeds (they are very gritty), but the rest
of the berry is just fine.