I had a LT A-5 in my younger days. It had it's indigestion when changing brands of light dove/quail loads . I even had to use Breakfree (teflon lube) on the mag tube for some of the lighter loads to get it to work even with the friction ring in the "light load" orientation. Putting a high tech lube on the tube really made a difference in reducing the friction and allowing certain light loads to cycle.