I agree with Vapo. Shooting specials should not effect accuracy of the mag loads. However if you shoot a lot of specials, it may foul the area at the front of the chamber and make chambering magnums a little difficult. Keeping the chamber clean will cure that problem. Specials may or may not be as accurate but only in the same way as two different Mag loads may differ in accuracy. If I do want lighter loads I usually just load down the magnum cases a bit but I have done both as I have a lot of 44 special brass as well. I love cast bullet special loads for small game and even self defense.