Re: what do you think
I sure wouldn't recommend it. That .001" isn't much when working with lead bullets of moderate hardness, but the jackets on slugs intended for rifle use tend to be thicker and harder than those used for handguns, so right there you are asking the load to do more more work and putting more strain on the mechanical components even before trying to swage down an extra .001" of hard (er than lead) material. The twist in the barrel is optimized for a certain weight range - the heavier .35 caliber rifle bullets are above this - accuracy is going to suffer. The bullets are longer, so to keep the OAL within spec (i.e., to be sure the cylinder will rotate), the base will protrude deeper into the case, reducing space and affecting - quite possibly in a dramatic way - the pressure curve. Etc. If it made sense, the bullet makers would offer heavier bullets out of the factory. If you want to shoot heavier bullets in a handgun, go to a bigger bore. My $0.02, anyway.