I have a Winchester Model 70 Super Shadow in .270WSM. I put the barrel/action in a Boyds laminated stock and had a gunsmith bed it and adjust the trigger. It used to shoot 2-1/4+ inch groups at 100 yards so I thought this would make it group better. I took it to the range last weekend and the shots were perfect windage wise but they were stringing vertically. I'm not talking a little, I'm talking up to a 24" variance! I talked to a friend at BPS and he said that was a bedding issue. Go figure. I called the sport shop and the gunsmith is on vacation until 9/5. Does anyone have any ideas what is going on without actually seeing the rifle? I know that's a tough one but I want to appear more knowledgeable when I bring it back to the gunsmith.

To answer questions before they are asked:

The Leupold scope bases and rings have been checked and are tight.
The Leupold VXII scope held a zero before, or as close to zero as the rifle would shoot.
The bottom 2 piece metal is new from Winchester. The front and rear screws are tight.
The barrel is free floated from the taper forward. About 3 inches from the lug.

Thanks in advance as I am aggrevated after dropping another $300 trying to get this thing to shoot and it's worse.