Why first shot of each magazine low and or left 1" at 50 yards?

[Joe L]

I've only had a Mark II BTV for a couple of weeks, but I have about 600 rounds experience now, including on benchrest rimfire match.

On two very windy days 20-30 mph, with the wind at 12 to 2 o'clock, the first shot from each magazine hits nearly 1" low or low left at 50 yards, even after leaving the bolt closed while loading the magazine. I can't figure out what I'm doing differently on the first shot of each magazine. Time from last shot of previous magazine to first is maybe 20 seconds. I use a bipod and rear bag. BTV barrel is free floating in thumb hole stock. Groups are excellent except for first shot of five. Action screws are tight. Stock is not bedded. Stock Accutrigger. Norma Tac 22 lead nose 40 gr and Federal GMM ammo do the same thing.

I'm open to any ideas. Will try on calm day as soon as we have one just to see if it is some quirk of barrel cooling or something like that. Most likely shooter doing something wrong in my opinion.

I will also check to see that there is a lot of clearance at free float, not just a dollar bill's worth, cold and no load on the bipod.

Joe