sabotloader,
I have been trying the Lehighs but even though they shot better after changing to the light blue smooth sabots from the CR sabots and increasing the charge of 209 to 115gr I still want to experiment. Ifeel I can get them to shoot better. The XTPs are just amazing. And Grouse I noticed the vertical stringing myself but I changed sabots. When using the Harvester light blue CR sabot they just piled up into one 1" spot.

bronko2200...I agree, the group is actually good even counting the first clean barrel shot. I have been using Montana X lately. Maybe it is helping. This is why I think with BH209 and this load I can shoot #1 clean and not worry.