has anyone ever tried Tac power is this cartridge ? thank you ,Pete53

TAC is way too slow-burning for decent velocities in either .22 Hornet. It's burn-rate is about like IMR4895.

I wouldn't even try it for "reduced-velocity" loads.

thank you that`s the answer i needed,Pete53

There are some oddball recipes on the data sheet packed with the Lee loader, but I never tried any. Might be something to try when you have a couple of tablespoons of 4831 left in the bottom of the jug, I suppose🤔

thank you,Pete53

I have both versions of the 22 Hornet. I recently picked up some Mpro 300, but can't find much data on it for the hornets. Any advise or links on loadings?
Thanks

Do you mean Alliant 300 MP powder?

https://www.alliantpowder.com/reloa...;type=1&powderid=29&cartridge=44

Yes, that's the one.