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Hi Craig
I would hesitate to switch barrels because there are so many other possible causes for variable accuracy. Also if the rifle shoots 150 grain well I doubt its the barrel. The Tikka .308 is a 1 in 11 twist which can handle loads a lot heavier than 155 grain, so something is not right. I shoot 165 grains with my t3 lite and get moa groups which is all I ever hope for or need in a hunting rifle. Mine would NOT shoot certain powders though. It would give me poor groups using Hodgdon Bl-c2, but fine groups with IMR 4320. So here are some things to consider instead of changing instead of the barrel 1. the type of powder and the amount of powder – there's a lot to play with here 2. Your case shoulders might be shy – have you checked them with a case length gauge? – believe me this can make a difference 3. Have you considered what your jump rate is? If your bullets are sitting too far from the rifling things will never be very accurate. I always make a dummy round and set the bullet long without a crimp and put it into the actual chamber of the rifle I'm loading for to find out just how far I have to set the bullet to just get to the rifling – There are plenty of articles on how to do this. . Some precision shooters have their bullet actually engage the rifling and have zero jump. For a hunter not a good idea, but you want that bullet close even touching is ok. These are just some of the variables to consider before even thinking of re-barreling. Again if it shoots 155 well I doubt its the barrel. If it were it would not shoot anything well. I hope this helps
