Vaquero POI change...

[mannyCA]

My buddy just got a new stainless vaquero mfg approx june 2014 and dang it if the POI doesn't change as the gun heats up. Seems to go 5 inches or so to the left after about a box of 1100fps cast .357 loads. So far we got about 3 of us to shoot this thing and the same thing happens everytime. Could this be a sign of a barrel constriction at the frame? Haven't had a chance to drop a slug through it yet to feel for anything.
Anyone else experience this or is it just us?

[shoot-n-lead]

Shooter trigger pull problem...nothing to do with the gun...if it does not do it all of the time.

Some of the Vaquero's (new and original) come shooting left (I have one) but it does it all of the time.