Most hollow point .223 ammo I have loaded are for precision shooting. An HPBT (hollow point boat tail) bullet has a higher ballistic coefficient and (arguably) flies truer than a FMJ. For those who use an AR-15 for a home defense gun, you can buy HPBT ammo, but its probably not designed as defensive ammo. You can also buy soft point ammo, generally designed for hunting with the AR, with the idea that a soft point will not penetrate as much (or as many walls) as a FMJ.
Having said that, there is data and a school of thought that FMJ is fine for home defense because, as anyone who has experience shooting 223 might know, a 223 bullet in flight can be deflected by as little as a brush twig, so passing through a house wall is likely to tumble and deflect the bullet trajectory as much or more effectively than using a hollow point or soft point. I personally use soft point 223 for my AR platforms that are staged for home defense, but I wouldnt stop to change a mag if I picked it up with FMJ.
Thanks. Which makes the prosecutor’s ‘testimony’ incorrect?