Gert,
My main discipline is muzzle loading and to date I have just been using components I had to hand. The Postell and Swiss #4 gave me adequate enough results to have a go at a match before the competition season ended. Now I have some work to do.
I don't have any #5 but plan to try it. The PP mould I have is for my muzzle loader, but I'll give it a go. Don't know yet whether to go for bore or groove diameter for a new mould - I need to do a little home work yet. Where did you get your Metford mould from?
My wife, Kim, has a Browning 45-70 and we have had some good results with a mould by Thomas Laumer from Germany - the bullet weighs about 560 grains. I also have a NASA style bullet to try which has worked well with Kim's rifle.
Winter will give my plenty of practice time (weather permitting

!). I have a 200yd range I can use that is a little less than 30 minutes drive.
David