I am a relatively new shooter for distance. I am in need of some advice. I have a Howa 1500 with MDT HS3 chassis. It has a heavy varmint barrel in 1/12 twist. It shoots 55gr bullets very well but accuracy diminishes as the bullet size increases. So I want to change barrels to a heavy Palma barrel or MTU barrel at 1/7 twist. I am also looking to possibly pick one bullet (the best) and developing loads with it. I’m looking for advice on bullets, loads, barrel length and any other ideas. Thanks to all in advance!