Blimey Fred never heard of that before!Hey Les, I was using a mix of RedShot and Oro last weekend both 24gm. The Oro are firmer in the shoulder than RedShot make of that what you will. I came in contact with the Olympic skeet shooters who seem to have an obsession with choke. They swear their patterns get tighter as a single round progresses and one walks the ground rodding his barrels another has a chamber brush on a rechargeable drill and keeps giving it a whirr. Come to think of it I've seen sporting shooters keep winding their finger round in the barrel.