you DON'T want to do that unless you're going to using LIGHTER loads all the time, and are done with load development- just changing the spring can and often does introduce a number of malfunctions , just as going to a heavier spring does- all guns are manufactured for a certain RANGE of bulletweights, and power factors- just that some springs have more oomph than others- play with bullet weights and powder charges BEFORE you go mechanical-
incidentally, as far as the 45 goes, stick to STRAGHT LEAD- you'll NEVER get enough velocity out of that case to justify going to a jacketed round- the ONLY reason i use a jacketed is to clean out the barrel and make it easier to clean the gun at the end- ie you load the BOTTOM round in the mag as a jacketed, but also respect the same bullet weight, oal, and powder charge- that way you don't get a "flyer" at the end of the run
