The best way i've been able to use an M6 trigger is to hold the trigger finger in the notch at the end of the trigger, and pull straight back. The hook kind of pulls upward while doing this. Feels a little awkward, but it will go bang without disturbing the sights too much.
The M6 is much thinner and therefore lighter than either the 22/410 or the Savage 24. Originally, the 22/410 Stevens, and later Savage, was sized for a 410. The Savage 24 was made slightly heavier in order to handle the 20GA round. When the centerfire calibers came out, it was strengthened up some more on the top of the action. I've had campers, LR over both 410 and 20, 357, 3030,223,357 max, and now have a few of the 12GA models. It seems as time went on, the gun was made heavier and heavier. Same can be said for the H&R Handi Rifles. The older ones, in 22 Hornet, 223, 3030, even 4570, seem to be lighter than the newer models made for higher pressure rounds. For serious use, i'd stick to the 22LR/20GA models, and preferably 24" barrels. The M6, and the Savage 24 Camper models, are great, but just like the 20" M16 vs 14" M4 barrel issues (less velocity, etc) it just seems that i can hit easier with longer barrels and sight radii.