I used the old style in 8mm in surplus Mausers and I thought they were magical (as a kid). This German Co. still lists them, most of the new ones are the capped point type.
https://en.strobl.cz/bullets-rws-rifle/ not sure about exporting them. Huntingtons imports the brass and in the past I believe the bullets as well. Midway sells some ammo but not the full line. Probably due to high costs there isn't more of a market here. RWS Ruag developed several interesting bullets and had a dual core design long before Speer did.
I bet John Nosler was aware of the H mantel as it came out some 13 years before he developed the partition.