I do the pvc pipes. Haven't had that problem yet. I did fill them with water with room to expand and froze them standing up on end. Capped after froze solid and ice flush with top. Maybe that prevented this?
I own a knight ultralite that I procured to hunt Washington State. I upgraded the sights to a peep and was very accurate on the range at 100 yards. I didn't work the gun past that point for the hunt I had in mind, but I am sure with load prep and practice it would likely be capable of a but...