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Conversely I’ve had a factory PMC projectile from my 223,Mini14 ( remember them?) go through a large red hind, made a neat hole between ribs, through the lungs and out between ribs on the far side....

Hmmm.. grandpamac.’’CAC problems’?
When did they occur and what were they?

I used to religiously use CAC 180 hollow-points in my Finnwolf with no issues ever.

Must have been a North Island thing as I knew a few NZFS guys way back and only ever heard of 303, 222 and 270 being used by them.
Oh and the odd 308.

223 is an ok round for clear shots accurately placed but not so good for punching through scrub or poorly placed shots.