A good Mk VI Webley will lock up tight when the action is cycled and the trigger held to the rear. A small amount of 'rock' is OK (about 5 thou each side). Wear in revolver timing generally occurs more or less evenly over all chambers. The correct way to check timing is with a 'range rod' which is a brass rod carefully turned to be a nice sliding fit in the barrel. Cycle the action , holding the trigger to the rear and the rod should slide neatly into each chamber. Mark any dicky ones with a felt pen and then you can observe the shooting results between good and poor chambers. I do have some Mk VI parts. I should add that that type of group on a pistol target is not uncommon and is caused by 'heeling' or pushing with the heel of your hand as the trigger breaks. This is usually caused by tight gripping with whole hand (especially the little finger). The correct grip is between the two middle fingers and the meaty base of the thumb, firm but not vise-like.
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