I think the heavy-load particle balls are much less prevalent, but you can still find some great lighter-load particle balls on the market.
Heavy-load balls for the average league bowler aren't too practical because 1- they require greater volumes of oil to retain enough energy to still hit and carry, or 2- the bowler needs higher ball speeds for the same reason.
The heavy-load particle balls can, however, be a great arsenal piece for those bowling more demanding conditions such as sport shots, and others like the PBA Shark pattern.
With the advent of newer, stronger, reactive covers that handle plenty of oil, the average bowler prefers them for the majority of conditions they face.
Particle additives provide extra friction, but friction too early on the lane can cause the ball to lose energy prematurely, and the bowler finds himself pounding the pocket with regularity, but not carrying strikes. Particle covers are also more porous than others causing them to soak up oil even faster, which means a little more maintenance, too.
Am I a fan of them? Yes, but only when the lane conditions warrant their use. If a ball company introduces a heavy-load particle ball nowadays, they are probably just trying to fill that "gap" for their tournament bowlers, because otherwise they can probably count on sales being somewhat limited.
Lighter-load particle balls, such as the Sidewinder and the like, can be very important additions to any arsenal. They react very similar to the strong reactives, but can handle carry-down better. They are also great for "blending" out the over/under that we sometimes see with the pearl reactives. I hope this helps.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah
Brunswick Amateur Staff