GBertolet
11-01-2013, 12:21 AM
I had been orientating the sprues on the .735 round ball up when seating in the hulls. I was kind of wondering if they stay centered when fired, or do they cock to a side before they engage the rifling. I believe this would cause a slight imbalance during the projectiles flight.
I had filed off some sprues to test with, but had not had a chance to fire them yet. Removing the sprue lightened the ball by about 15 grains, or about 2.5% of the 600 gr RB weight. I had been consistently getting groups in the 2 inch range at 50 yards, sometimes even smaller, with sprues intact, and I am trying to better this accuracy if I can, even though this level of grouping is satisfactory.
I am using a NEF slug gun with rifled barrel. My load is 40 gr of Blue Dot, BP Air Wedge gas seal + 1/2" hard wad +.125 hard wad + AA White gas seal, cut off a shotcup, inverted to form a cup for the RB + .735 RB wrapped in 7 inches of 1/2" teflon tape. Chronographed velocity of 1300 fps.
Has anyone done any testing themselves on this?
I had filed off some sprues to test with, but had not had a chance to fire them yet. Removing the sprue lightened the ball by about 15 grains, or about 2.5% of the 600 gr RB weight. I had been consistently getting groups in the 2 inch range at 50 yards, sometimes even smaller, with sprues intact, and I am trying to better this accuracy if I can, even though this level of grouping is satisfactory.
I am using a NEF slug gun with rifled barrel. My load is 40 gr of Blue Dot, BP Air Wedge gas seal + 1/2" hard wad +.125 hard wad + AA White gas seal, cut off a shotcup, inverted to form a cup for the RB + .735 RB wrapped in 7 inches of 1/2" teflon tape. Chronographed velocity of 1300 fps.
Has anyone done any testing themselves on this?