AG-H,
thanks for the link to the CastBoolits forum — yeah, I think I will spend some time there....!
I have been looking at the Corbin swage presses — wow, a LOT of money to get started. But hey, this airgun bug has bitten me pretty bad, so it seems like I would be shooting a lot to make this not just an "expense" but an "investment."
And LongShot has really worked overtime to convince me this is the way to go.....! — What a
ruthlessly effective pack of enablers you AGN'ers are!
I have to take the long view of this — as I heard the Corbin dies have waiting periods as long as a year.
But that's OK. It gives me time to find a gun on the classifieds. Maybe get it modified. Figure out what projectiles I really want to make myself (and which projectiles I will try to buy from dealers in the US and Peru).
You asked about slugs — yes, I'm thinking of possibly making both:
▪
Slugs for my extreme long range gun (existing in my dreams, however, the scope for the gun is arriving on Saturday — one piece at a time).
▪
Pellets for angled shots, where I don't want a high BC slug travel for a mile or more downrange.
➔
And they must have a huge hollow point for maximum expansion.
➔
For these I want a BC of around 0.040 maximum. 
I still do like some advice on
what dies exactly I would need to buy — and what kind of pellet shapes are possible with those dies.

Or what dies exactly do I need to make a WC HP (wadcutter hollow point)?

Or should I rather go with a SWC HP (semi-wadcutter hollow point slug)?

Or simply a slug with a hugely gaping HP?
This is all very new to me.... — but another exciting rabbit hole of our airgunning hobby to fall into....!!
Matthias