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Some possibilities:
1. Are you shooting relatively fast, or letting the barrel cool between shots? If fast, then possibly barrel temperature is making the difference.
2. Are you shooting the 5-shot string starting with the same chamber in your cylinder each time? If so, it is not that uncommon for a revolver to have different chambers shoot to slightly different points of impact with the same aiming point. But, going from .75" to 3.25" at 50 yards in a little much for that particular issue. Still worth checking, though.
3. Since it is the LAST 2 shots that are fliers each time, there is a particular gun malfunction that will produce that. Your cylinder may not be latching for those shots. The problem occurs when the pawl that turns the cylinder does not QUITE get the cylinder to the point where the latch will engage. When the cylinder is pretty well balanced with ammo in all chambers, the cylinder turns far enough for the latch to finish turning the cylinder and drop into the notch. BUT, for the last shot or 2, the pawl is trying to lift bullets in the loaded chambers on one side that are not balanced by bullets in the already fired chambers on the other side, and the latch doesn't drop into the notch before gravity pulls the cylinder back a little. So, you fire with an unlatched cylinder and slightly misaligned chamber for ONLY those last two shots. I had a new revolver that did that because the pawl was machined slightly too thin. Once I realized that my gun was shaving brass from my bullets and leaving some in the forcing cone, I was able to find the cause.
4. Maybe it is YOU. Are you resting between shots, or do you get tired or lose focus by the 4th and 5th shots?
SL1
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