I use a simple strainer and a pestle to remove seeds. I like to make syrups of fruit. Removing seeds has always been easy although one loses some of the pulp too. The more you work the pestle, the more pulp you push through.
Yesterday I made pink currant syrup, raspberry is next
The above method would help for jam, not so much for pies. Try Aurora honeyberries instead. IowaJer posted an excellent recipe for honeyberries. I tried it and liked it a lot with a little ice cream! (serve hot).