"Mac is a friend, but I disagree STRONGLY about the use of the so-called driving band monos in a double rifle."

I would be interested to know if this opinion is based on sound technical reasons or whether it is just an opinion, a gut feeling or hearsay.

I have said before: If a double is delaminated or damaged as a result of using GS Custom drive band bullets, GSC will pay for the repair.

We have proved that the lowest barrel wall pressure of all bullet types is found with GS Custom drive band solids and expanding HV type bullets. These bullets are 100% safe to use in all doubles, especially the fragile ones. We even offer custom made bullets for guns that are not exactly on spec with bore and groove sizes at no extra charge.

There is no logical reason for not shooting GSC drive band bullets in any firearm and, specifically excluding them from use in doubles, shows a lack of an understanding of the interaction of bullet with barrel.