I have used Gauge Mates, those that stay in the chamber, with good success. I use 20 ga. in a 12 ga. and the pattern results have been excellent. Much better than I can get any of my 20 ga. guns to shoot. I have also shot a few hundred starlings using the combination and it performs well.

I would say go for it as you will like them if yor results are similar to mine.

Lenard