I have had good sucess with my 79, drilled 4x4, 2-1/2" pin, pin over ring, pap 5-3/8 x 3/8 up. On mediums to light heavy it is very predictible, clean up front with a very angular move at 45 feet on clean backends, yet not a skid/snap. Used it last night, 684, 4 opens, 2 splits and two wiffed 10's.
Good ball for medium oil with fresh clean backends.