I have found that for K-frame or larger, I prefer either an exposed backstrap or a backstrap covered by only thin rubber that does not significantly change the shape of the backstrap. For my medium sized hands, this allows me to grip the gun so the central axis of the barrel is in line with the central axis of my forearm when viewed from the top, while still getting the right amount of finger on the trigger. This forearm/barrel alignment makes a straight back trigger squeeze easier to perform.
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