To the OP's original issue, and before he shoots the gun: as stated already, double-checking the make of the gun is critical here, and a more exact description of the issue is necessary. Otherwise, there are too many wrong-way rabbit holes to run down trying to guess at the cause.
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Originally Posted by RoyceP
While the posts above may be well intentioned I find that the 146 grain bullet shoots several inches low in my revolver. When I switched to 200 grain bullets the point of impact was very much the point of aim.
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Post #2 also pointed out that the POI would shift. Your result is typical of all revolvers. In a semi-auto pistol, the barrel stays relatively stationary (if the shooter doesn't yank it out of alignment) until after the bullet exits (before the slide starts passing much of the equal and opposite-to bullet momentum to the frame). But a revolver's muzzle starts to rise as soon as the bullet begins moving out of the case, and the heavier and slower the bullet, the more rise occurs before the bullet clears the muzzle. For this reason, it throws heavier bullets higher.
I remember doing a bunch of experiments with revolvers in the 1980s, and I found that changing bullet weight always had more effect on POI than changing the charge weight. The reason is simply that though a higher charge causes greater muzzle-raising recoil, the bullet is also out of the muzzle sooner, allowing less time for it to rise at that faster rate. So, there is a degree of compensation present when changing charge weight, whereas changing bullet weight doesn't have that.
Once the gun is sorted out, this kind of weapon is great for cast bullets, so you can get a bullet weight that matches your POI as perfectly as possible. New brass is available at starlinebrass.com, so you can roll your own without having to buy commercial loads first.