Hi break Will change a barrels barrel tune. I use a barrel tuner on my long range target rifles and i can move them 4 thou along the barrel and the groups will open or close up. any change to your bedding weight or length of barrel will effect the final tuning. You can then re tune the barrel with your loads to get the best accuracy out of the rifle. I would also check that with the extra weight on the end of the barrel it is not touching the stock in any area now.
Cheers Bill
Australia
Cheers Bill
Australia