Hello from the UK!

Welcome from Central Arizona! Glad to have a different perspective. I certainly would look at cartridges/components that are readily available and figure out which is more intriguing to your distance. You can always modify larger volume brass to shoot traditional bullets. The 6.5 mm is making a lot of people happy here. I use 7mm currently. Just start researching.
Good luck!

Very good point Bob, thanks! Always easy to get sucked down a particular route without regard to whether I'd be able to feed it (at least for me it is!)…
 
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