How do you change recoil springs on an M&P? DO you have to buy a new spring and rod, a whole new assembly, or is there a way to take out the little black hex end that keeps the unit together so I'd only have to buy the springs?
I had pretty much the same thing as you except for W231 for powder so I could load all pistol with the one powder. The 550B keeps me more than happy shooting 1000 rounds a month or so. It does well with .223 and H335 powder.
I kept the RockChucker for .270 and my .223 varmint gun.