H322 and both the 4198's are good. I found H322 to be VERY accurate in all my .45's over the years, but I obtained top ballistics with H335 and H4198 as well as IMR4198.

The ballistics below are given for a 24" bl. & are straight from Hodgdon. Everyone should purchase Hodgdon's Annual Mannual if you already don't have it - every year. It is the most up to date loading data out there.

Hodgdon lists, for the Lever Marlins, 350gr. Hornady:
IMR4198 - 50.0gr. for 2,131fps at 36,600cup
H4198 - 54.0gr. for 2,191fps at 39,300cup

They do not list H322 with the 350, but list it for the 300 and 400gr. bullets - with 300gr. 63.0gr. compressed for 2,252fps at 32,600cup. and 55.0gr. with the 400gr. at 1,984fps at 39,200cup.

These are full capacity loads - note that H322 is a bit slow burning to deliver top-end speeds and pressures for that rifle. Lackl of capacity beats it due much to the necessarily deeply seated bullets and 2.55" oal.

IMR 3031 and IMR8208XBR are sightly more suitable and deliver higher speeds, both also with compressed loads and sub-max pressures. Both of these run over 2,100fps with the 350gr. Hornady.

The Marlins have a ceiling of 43,000psi. Usually only the very fast powders like Re#7, the 4198's and ball or sperical powders like H335 are capable of delivering & exceeding this pressure level in that case. 43,000psi/cup is exceeded only for bolt guns and single shots like the Ruger.

Note in this ctg. psi and cup are actually the same number. That means 43,000cup is 43,000psi. This happens only rarely.