I just bought my first autoloader, the SPR 453. Made by Spartan, and imported by remington. These gun seems very well built and came with 4 choke tubes all rated for steel shot. My question is if I can fire lead shot through these steel choke tubes? I have heard not to fire steel through lead tubes but how about the opposite? Seems to me that the softer lead should easily pass through these tubes but I just wanted to ask some more experienced shotgunners. Thanks for any info or pointers you might have.