I have a winchester 1300 with a B-Square scope mount with high weaver rings. I am shooting a 28" vent barrell with a screw in riffled choke. I went with the high rings to minimize the amout of barrell I was seeing through the scope(Bushnell 1.57-4 x 32).

When I was at the range I would get 1 or 2 shots dead on at 100 yards then the next one would go 10" high, then low, then high, Very frustrating. When I got home I realized that with the mount so high, depending on how I settled in to look through the scope it would affect the impact of the crosshairs on the target. If I settled in and put the crosshairs on the target and then slightly lifted or lowered my head the crosshairs would move up and down from the bullseye. Does this make sence? Should I by low mounts and just deal with seeing more of the barrell.

Sorry fo being so long.

Sounds like you have parallax problems. IMO
I would suggest make it so you hold your head the same every time. (pad buttstock etc.) Or go to lower rings so you can rest on the stock.
Most shot gun scopes, if that is what you have, are set parallax free at 75yrds.

Upnorth,
You want to mount that scope as low to the barrel as possible with no contact being made with the bell and barrel. The higher you mount your scope, the higher you have to keep your face on you stock. You want to be able to have your face firmly on the stock and you will be looking from the same angle everytime. It also helps your jaw and cheek from getting beat up.

You' ve gotten some pretty good advice, so I won' t offer any. I will however tell you a little story.
I had a Bushnell scope once. It did the same thing yours is doing. When I came home from the range I took the scope off the rifle, cleaned the rifle and put it on the gun rack. I dropped the Bushnell in the garbage can. Haven' t owned one since.
This is not advice! Try everything else before you head for that garbage can!!
I did, and I knew what the particular problem was. I took care of it.

Best of luck.

critch