Can you even move enough copper to make a .224 into a .223 or .222? Just asking. Anyone here smart?
If you work with metal much, you know it is fairly easy to move small amounts of lead and copper around with steel. The issue is, what happens when you do it, thus your concern about pressure, and to a lesser degree, whether the bullet remains structurally sound.
(BTW - no claim to be "smart.")
All revolvers are individuals - in fact, almost like a family of individuals in one gun - since you have six chambers. My "thinking" is that I am not nearly as concerned with pressure as the bullet goes down the barrel as I am with it getting out of the cylinder. In both of my remaining Jets, a .224 diamter bullet will drop nicely through EVERY chamber, in both cylinders, with no discernible resistance.
I do not hotrod any gun. I am always more than willing to buy a bigger one, if needed, so I don't have any reason to crank one up to the red line. My typical Jet loads run in the 1500-1800 FPS range, and usually will shoot a pretty nice group. If you shoot five groups in a row, invariably, you will get one that will make you shake your head (among other things).
I do not suggest that anyone use .224 bullets, based on my experience. The Jet shooter needs to evaluate his gun carefully, and do some careful measuring before trying anything out of the ordinary. If he doesn't have tools to do this, he should buy some and practice using them before making any judgments, since precision measuring tools do take a little skill to use.
I have never had any Remington component bullets to reload. I do know factory loads shoot better than anything I can make, but that doesn't necessarily mean the bullets are the only thing making them work. I also know new or once-fired brass delivers substantially better accuracy than brass that has been loaded 5-6 times. But even with new brass, I don't seem to be able to duplicate Remington's results either for accuracy or velocity, using the bullets I have to work with.
I would sure love to have about 1000 Remington bullets to monkey with. It would be just what is needed to get me interested in breaking out the Jets again and doing some more R&D. As things stand, I am happy with the loads I have, and not concerned about the safety aspect, but they are not factory equivalent. I have seen more than one ruined Jet cylinder, but (knock on wood) so far, none of them have been mine.