My self imposed rule is to not post exact loading data on the internet, for various reasons. I used to be a moderator on three different reloading forums and I saw some really bizarre data posted.
With that said, Loaddata.com has loads listed for a 185 gr. cast GC bullet and LilGun from 14 gr. to 16 gr. I've avoided the 16 gr. loads, just because I didn't feel the need, but the 15 gr. load shows 1,710 fps across my PACT Professional Chronograph, and it's accurate enough in my light little Marlin leverguns that I stopped right there and called it good.
I've stopped hunting deer, and only hunt elk these days, but I'd have no qualms about using that load on deer. For elk, I use either a 444 Marlin or a 45-70 Marlin. Both do the job well and I have a love for leverguns. About 20 years ago, I dropped a Northern Alberta moose with one shot from my 45-70 Marlin at a measured 125 yards. The Indian guide was impressed, to say the least. He said it sounded like a kettle drum when that 405 gr. bullet hit my moose.
Hope this helps.
Fred