In my opinion if you are gonna use two differant loads, use two differant calibers. Say, .45 for the rifle and .38 for the pistol. Otherwise you are going to mix up the loads at the loading table, guaranteed. You will be in a hurry and whatever you do to mark or seperate the load will go out with the summer breeze. And if ya stand there and take too long sorting and loading, they'll probably skip ya. At the ranges we shoot it is simple enough to use the same load. I do with BP and when I shoot smokeless. It may not be the most effecint loads but it is the simplest. A word of advice, though. Work up a good load for the pistol first. It is MUCH easier to adjust your rifle sites to the load than trying to compensate with a fixed sighted pistol.