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I remember Remington produced their Accelerator round decades ago; saboted .223 projectile in both .30-06 and .308. Advertised as (IIRC) ~3800 fps.
I read an interesting analysis about 10 years ago about .223 jacket frangibility at high revs; guy did some FEA and found that 55 gr FMJ (I think) .223 became unstable and jackets failed at about 300K-320K rpm.
5000 fps MV from .308 with 1-12 twist would be ~300K rpm, 1-11 would be ~330K rpm, and 1-10 around 360K rpm. I'd bet you'd need a pretty substantial jacket to avoid disintegration at those rpms; using a super-light projectile (like 35-40 grain, or even something in .17) would have even thinner jackets that I bet wouldn't hold up to the revs. Maybe a super-light solid or sintered projectile?
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Dale
1985 Carrera 3.2 -- SOLD
2026 Jaguar F-Pace / 2025 Ford Bronco Sport
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