Hi there. Observations in no particular order.
- The recommendation of either Tubal propellant is founded in the reminiscence that Gehmann had their cartridge loading outsourced to Norma, who at some time used an unsuitable Bofors powder (probably not canister grade, I would surmise; and I have no idea whether it really was close to RP 5). Results (repeatedly): KA-BOOM.
When this was discovered (I think the DEVA e.V. was involved for expertise), they changed for a very progressive Vectan powder, either Tubal 7000 or Tubal 8000, and nothing bad happened ever since.
- Several German reloaders reported to be very content with H 1000.
- Careful with the bullets. Measure EACH bullet base with a micrometer before loading. Respective warnings were given for Degol and Romey.
- For obvious reasons, the 5,6x61R is a lot more dangerous than its rimless brother, if and when pressure goes wrongggg.
- 80 grains bullet weight seems feasible with the given twist, but is far above all European accustomed and recommended weights. I wonder whether a leadless projectile would not be the better choice then, e.g. HDB and Aero.

Carcano