I had trouble getting 155's to group well in my model 700 tactical, but I'm having good success with 168's and 175's. 20 inch, 1in 12.
Tried 4064, h335, Varget, 8208 XBR powders, nothing to work in the remington. But they group well in a Win 70 with a 26" varmint barrel.
Just my 2 cents.