hi. i am currently using 100grns of 3fg wano powder. on top i use a 240gr .44mag lead bullet in a sabot. accuracy not quite good enough. has anyone got any advice for me on how to get an accurate load for 100-200m distance

Have you looked at the one-hole-100-yard-3-shot target I posted?
Use this load:

3 pellets of 777 (about 150 grains total)
209 primer CCI or Winchester
Hornady 300-grain SST/ML sabot for 50-cal muzzy.

That gave 1942 fps at 15 feet from the muzzle of my Lyman Mustang Breakaway 209 Magnum muzzy.

Lessee sumbuddy top that load.

I killed Bambi with that load 11 days ago. That reminds me to go pick up the fresh-frozen meat at the processor.

Everybody is raving about Blackhorn 209 powder.
Sounds good to me. Must try.
TC Shockwave bullets are reported to come as bonded or nonbonded, otherwise very similar/same as the Hornady SST/ML.
Both changes might be improvements ... if they shoot as accurately.