Greetings @Sanctuary and all,
One thing that only @caberslash has brushed on is the need for a faster twist to stabilise the heavier and longer high BC projectiles that you want to use. I wouldn't go below 1 in 8 inches and some projectiles will need a faster still twist. Some rifles chambered for older cartridges will have slower twists and will not stabilise the projectiles you may want to use. Last year I was taken along to the local full bore range by my son. He was shooting a .308 at 1,000 yards. Believe me 1,000 yards is a long way and the .308 is up to the task. Go along to your local range when they are shooting FTR and F Open one day.
Greetings Grandpamac.
PS. You WILL need to handload.
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