I forgot what it was called, but years ago Remington made a little bolt action pistol in their 221 Fireball. This was a little pistol cartridge that fired the 223 bullet.
A friend of mine brought me one of the little bolt guns and wanted me to re-chamber it for a 223. Before hand, I wanted to play with the gun to see how it shot, and try to determine if there would be any advantage to chambering the gun in 223.
I declined the job, thinking Remington spent millions of dollars to develope a 223 cal pistol round that would work in the short barreled bolt gun.
My friend was disapointed but I couldn't see modifying the gun knowing I couldn't improve on the factory offering.
He took the gun to someone else who did re-chamber it to 223. He never could get it to shoot as well as the 221 fireball round that Remington Chambered it for.
I wonder if this is what Mr. Duane Thomas had in mind when he made that statement.