I traded a Beretta 682 Gold E combo last fall for a Kolar unsingle combo. I shot primarily 1 oz loads through the Beretta for singles, doubles and caps. The Beretta seemed to prefer 1 oz over 1 1/8 oz loads. Always shot better scores with the Beretta and 1 oz. The Kolar is just the opposite. Likes those 1 1/8 oz loads, the faster, the better. With a PFS stock on the Kolar, recoil is not much of an issue. But I have a boatload of 1 oz shells, both reloads and factory, to shoot. I had been shooting singles with an IM in the Kolar and scores were dismal with 1 oz. Lucky to break scores in the low twenties with it. So today, I thought I would tighten the choke, per conventional wisdom, to a light full. Scored a 19. Shot a 75 bird derby with 1 1/8 oz and did well enough to take home a buck or two. Decided to shoot another singles round with 1 oz but took the light full out and put a mod choke in. Scored a 24. What's up with that? So, two questions. Anyone else have a gun that prefers 1 ouncers over 1 1/8 ouncers or vice versa? And IS the conventional wisdom to tighten the choke for 1 oz or to open the choke for 1 oz?