I started shooting skeet with pump guns, Remington 870's and Winchester M12's and M42s'. All had skeet chokes, with both the 870 and M42 having 0.005" constriction in the .410. After 2 or 3 years, I went to a Remington 3200 with Purbaugh sub gauge tubes. The 20 gauge tubes had 0.014" of choke, and the .410s had 0.007". I don't recall the constriction of the 28ga tubes. My scores immediately went up, which can be partially explained by going to an O/U, but is also partially due to better centering oft the patterns on the target required by the tighter chokes. I shot a good many 100 straights with the 12, 20 and 28 gauges, but never managed more than 99 with the .410, but I did shoot a number of those. when I missed a target with any of the gauges, I missed so far that a stray pellet couldn't have helped! all but one of the single target misses with the .410 were misses in front of the target on low 6 in the last round - and were simply caused by becoming so wound up by having gone straight to that point that I either started early or swung too hard. The other 99 in the .410 was shot after missing the first target of the first round, then breaking the following 99, and that was the most difficult for me, because after blowing the easy high one, it was hard to concentrate on the rest.