Mt Al,
Mike Harrel's advice is correct, but mine is only additional. I suggest you examine the front sight under magnification to see if a "bead" has broken off (will cause "high" shots). You asked about cleaning between shots, you should shoot both barrels as quickly as you can line the sights up for the second shot (it helps to shoot on two side by side targets, right barrel right target left barrel left target, so you don't take time trying to see where the first shot hit. You can transfer point og impact from one target to the other to determine if the barrels are shooting "wide" or "crossing"). You should let the barrels cool to ambient temperature between each pair of shots, if you clean the barrels, you can do it while cooling between the pairs of shots. You should shoot three pairs of shots at first and it might be helpful to see how cleaning between each pair of shots differs from cleaning after 3 pairs with regard to points of impact. As indicated by Mike Harrel's advice, if the barrels shoot "wide" more velocity is needed, and if they "cross" less velocity is needed. Velocity can be varied by power charge or bullet weight. When reloading, I advise against setting the shoulder back since this will cause "head separation" and case loss and Bertram doesn't give theirs away. The way I avoid setting the shoulders back is to smoke a fired case neck/shoulder or color it with a magic marker and then adjust the sizing die to just kiss the shoulder. Adjust a little at a time and the progress will be obvious from the die rubbing the smoke/magic marker off. If you set the die according to the die maker's instructions will likely result in setting the necks back. Rimmed and belted cases are notorious for this because they don't headspace on the shoulder and its location is not as strictly controlled in chambering. I hope you find this helpful.
Mike
