SS109 is a bullet construction specification and it isn't AP.
Second, NONE of those propellents are what is used for M855 Ball. Just because someone claimed H335 is the civillian equivalent of WC844, it isn't an accepted lot of WC844, otherwise St. Marks/Primex, the current supplier of WC844 to Lake City Army Ammunition Plant would have sold it as such under contracrt. Instead, it is a lot that was probably rejected for one reason or another. Using the specified charge in TM 43-0001-27 would not be a smart thing.
Likewise, pulling what appears to be real LC M855 might lead you to believe they are using another powder or a different charge weight. Don't do it. Even if your buddy snuck some out of Fort Leavenworth after his last summer FTX with the National Guard, the ammo produced under TM 43-0001-27 has to conform to pressure AND velocity standards. Unless you have the same equipment to measure PRESSURE, keep within the PUBLISHED data.
Sorry to sound like an ass but 55,000 PSI letting loose inside the receiver of an AR15 is a BAD THING. It WILL split bolts, DESTROY magazines, BALLOON RECEIVERS and VAPORIZE brass. Ask me how I know. Because I had a near starting load of AA 2520 let loose in a Federal American Eagle brass case, The right side of the ejection port was GOLD from the vaporized brass. Had I been a southpaw, it might have been permanenly scarring. I escaped without injury. My rifle wasn't as lucky. Upper, bolt, magazine and charging handle were toast.