BLUEDOT37's pictures are excellent.
Agree with Groo1 comment regarding loss of velocity and heavy for caliber bullets. Individual guns will cause some variance, but for the most part, heavy bullets lose less velocity as barrel length decreases.
Not meant as a criticism, but I have a different outlook on the durability issue. With S&Ws lifetime, no cost to owner, warranty, I hope I'm able to shoot enough to wear one of these guns out. Very few will shoot enough .44 Mag level ammo thru these M69s to wear one out (especially the 2 3/4 incher.
For me, the M69 2 3/4" is GTG.
One last picture -- 2 3/4" M69, 265gr SWCGC, 23.5gr H110, offhand at 25 yards.
Certainly can't do that on demand, but this little gun is fun and easy to shoot, at least for me.
FWIW,
Paul