I recently replaced my Lilja barrel with a Hart barrel. I have a Rem 700 action and a Jewel trigger. It is a 22-250. This is my third custom barrel. Is it normal for it to take up to 600 rounds until it shoots good. By that I mean under 1/2". This barrel was shooting at 3/4 or more until I hit 600 rds. Yesterday 8 5 shot groups averaged .41 at 100 yds. One group was .17.