With the magnet holding the ball is there a small drop off in speed? Any data on this?
Yes but i mean the force of the magnet pulling against the momentum of the bands/ballThere is a reduction in speed, of course, because the weight of the bag is comparable to the weight of the projectile. Even if the pouch weighs only 2 grams, it is equal to the weight of an 8 mm steel ball. In the descriptions on various sites came across pouches weighing and 4, and even 6 grams, this is a very large parasitic weight. This is the reason why I never bought them.