I have both 243 and 6.5 creedmoor and have used both for all uk deer species and both are capable (usual put the bullet in the right place caveat applies)
As you already have a 222 I would pick the 6.5 creedmoor. If rifle and ammunition costs are a concern look at a second hand rifle and reloading. Realistically how many rounds a year will you be firing in the 6.5? When you have an idea of the number, work out how much diesel you’ll buy travelling to and from your ground. Ammunition costs are a small spend in comparison. All the best
As you already have a 222 I would pick the 6.5 creedmoor. If rifle and ammunition costs are a concern look at a second hand rifle and reloading. Realistically how many rounds a year will you be firing in the 6.5? When you have an idea of the number, work out how much diesel you’ll buy travelling to and from your ground. Ammunition costs are a small spend in comparison. All the best

