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J.T., if the primer question is your main question, it should be perfectly ok to substitute another similar primer for the Fed 150's. When the books say don't mix primers, I believe what they mean is don't change primers, or any component for that matter, without first backing off your powder load at least 10% and work up from there. IOW, don't substitute brand y primers for a load you've already worked up with brand x primers just because you ran out of brand x and need to load a few more rounds and have some brand y lying around.
Most reloaders tend to standardize on one primer manufacturer anyway. The Fed 150 is a standard LP (not magnum) primer so any standard LP primer, such as WLP, should be fine (although Win says the WLP can be used with standard or mag loadings). It isn't necessary to use a LP magnum primer with any 45 ACP even a +P.
As I said in one of the lost posts, you might want to get a copy of Midway's 45 ACP LoadMap. They have lots of loads specifically for the Rem 230 FMJ.
You're on your own when experimenting with +P loads. When you start testing the edge of the envelope, several factors come into play that you don't normally need to worry a lot about - proper crimping, proper and accurate OAL, more accurate powder measuring, etc.
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