I just wanted to share my experience and encourage someone in the quest for round shot. I have little space and 5 kids And I've always felt compelled to use water soluble coolant. I've used TrimE206 mixed about 1 quart to 3 gallons of water, for about 1500 pounds of slightly dimpled shot. I switched to cheap antifreeze and got a small hole instead of a dimple, but good looking shot otherwise. I read that thinner viscosity causes the dimples and holes. I added liquid detergent ( couple of pints) to my antifreeze until the dimples went away. Just thought I'd share.