Posted by Tom Martin on November 1, 2014, 6:24 pm, in reply to "Re: 12 to 20 woes"
I had a set of inserts that I have since passed on to a friend, and they worked well in all gauges, 20, 28 and .410. The brand of shell can make a big difference. I never had any trouble with Winchester or Remington target shells, but Estates and others with steel heads will stick.