Well since the thread said Cal most often carried , and not gun or load :
More or less equal split of .38spl , 9mm , .45acp, oftem mixed or matched at same time. Next most common when emphasis in the woods and mtns - .45Colt .
My current prefered .45acp is Ruger P90. Still a single stack equiv size and weight to Combat Commander. Because I shoot it well , and it fits my hand better than my Combat Commander as presently configured.