I roll a 15lb ball. Tried a 16 and didn't get any higher pin count. 15 also gives me a little extra speed for dry lanes without having to change to a different ball. I hear you on the shoulder thing, but my issue is carpal tunnel. Being an IT admin hasn't helped out as I'm sitting at a computer typing all day. Hasn't helped my game a bit.
I wouldn't trade it for any bowling ball past or present. It is so forgiving it's not even funny. I've rolled multiple 297's and 298's with it and choked, but definately not the balls fault. I'm a decent bowler, but far from good. I think my highest avg a 7 years ago was 225, but I bowled 2 or 3 times a week. I just started bowling again in a church league last year with my son after taking off for probably 7 years. Still a little rusty only bowling every other week. I hate 10 pins, but pick up about half of them.
I will say that the one I have was not approved for the pba national tour at the time. I don't know if they make anything close to this one anymore.
The Low RG (2.50), High Differential (.073) weight block is illegal by today's USBC standards, but since it was approved prior to the rule change it is perfectly legal for all USBC and PBA Regional competition.
The Sure Griptm solid reactive coverstock is a performance proven winner over the last several years and is still one of the highest friction coverstocks on the market today.
SD-73 CLASSIC� Ball Facts
Coverstock Sure Grip� Solid Reactive
Weight Block High density cylinder with "flip" block
Ball Color Purple
Ball Finish 1000 Abralon
Durometer 73-75 Rex D-scale
Flare Potential 9"+ (High)
Fragrance none
Weights 12 - 16 lbs.