Should be. 6.2grs is a middle of the road load. I get around 850fps of velocity. Lyman's Cast Handbook shows 6.0 to 7.5grs of Unique as there load data with a COL of 1.235" That is for a 200gr Lead SWC.
I use 1.245" as a COL (I dont remember the source of that figure it was over 15 years ago that I developed the load) but like I said Lyman used 1.235" with their data.
The 7.5 Unique load is a 1150 fps+ load in my 1911's, so consider that as excessive for most use. 6.5 grains, depending upon bullet seating depth, is likely in the upper range of 900's to just below 1000 fps for me.
I am shooting the MiHec 200 SWC (H&G #53 clone, I think...) w/ an OAL of 1.250". Load the cartridge to an OAL and then drop one in your bbl - the rim of the case should be even with the edge of the bbl. How I worked mine up and works great.
FWIW - Unique was ok, but Power Pistol was better for me. My buddy's 45 (brand new) shot the PP and a Clays load superbly.
My bullseye pistol load for the .45 ACP is a 200 gr SWC & 4.2 grains of Bullseye -- gives me right at 800 fps, and is absolutely accurate in my 1911. Standard Deviations with this load are 8 fps in my pistol.