AA1680 or N110, also flat base bullets need to aligned up with case mouth before seating. Case walls are thin and will collapse when seating bullets if your not careful. I have owned several hornets and almost all liked a 40 grain pill the best which maybe due to rifle twist and velocity.
You can try a 50 grain bullet and see. The little cartridge also develops high pressure signs with reloading data near the max. Usually primer pockets blow out,or case swells ahead of rim.
If you can find some Calhoun double hollow point bullets, try em. They make big holes!