ruger357w, have you tried any factory ammo in your new pistol? If so, how does it feed? If it works OK, you need to compare the external dimensions of your handloads to those factory rounds that work OK - length. and the diameter at several ponts on the cartridge case, such as case mouth, midway back, and just in front of the extractor cut.

A .452" bullet COULD be the problem. But if so, you have a very tight chamber! Did you try just using the barrel as a "cartridge gauge" as I suggested? If so, what id you learn?

I seem to recall that GI Ball ammo used bullets that were quite a bitunder groove diameter, and that this caused excessive gas-cutting, thus considerably reducing barrel life. I just don't remember the size of those bullets, but I believe they were around .450". I also don't remember WHY the Army used the small bullets, unless it was related to a need for reliable feeding under combat conditions.

You could load up a couple of dummy rounds with .451" bullets and see how they fit into your chamber. If they go all the way in, load them into the magazine and see how they feed.