Upgrade to .223 wylde for caliber availability and operability and this is an OK starting point.
A small cartridge for an accordingly small rifle, but one that permits the kind of accuracy that amounts to fast and clean kills. Popular among metallic silhouette and long range shooters for its low recoil and high accuracy. By no means an obscure cartridge, many manufacturers produce the 243 Win with every conceivable bullet type. More than six decades on the market means a great variety of rifles available.
Seems to address all concerns of OP.
.223 wylde gives access to .223 Rem + 5.56 NATO. Ultimate operability for replacement parts (barrel, etc) and ammunition.
243 Win is an obscure caliber compared to either of the above individually, let alone combined.
You may love your round in an endearing boomer-tier way, but it's bad advice for OP.
You're super tacticool bro, I get it..
.243 is more accurate and a better cartridge, an ar-10 platform chambered in .243 makes your other points moot.
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