If you deliberately throw your statics out of whack to require more than normal weight removal, maybe 5oz or so.  But you can only really do that if you can get statics out of whack enough.  If your hard-to-find ball has 2.5oz of top weight, you can only remove so much before it's illegal the "other way" (i.e., too much side weight on the other side of the ball).  Same for finger, thumb, top, and bottom weight.

I did hear of a guy who sanded a 16# ball down to 15#, maybe that's an option.  

I don't think you'll get that 15.11# ball down to a normal 15# weight.

SH

Edited on 9/25/2007 11:52 AM

most 15 are 15 1 oz to 15 4 oz

with that in mind

i call that ball about 15 1/2 lb after drilling

which usually does take out about 3-4 oz

like mentioned before
depends on size of hole/depth/weight hole

but 3-4 is typical

if you cna throw 15 no problem-get the 15.5 lber

Jeff, are you still finding that you're only taking 2.25 - 2.5 oz. out in Lanemasters/Legends balls?  I'd think that taking out big chunks of coverstock would take more weight out than taking chunks of coverstock and light density intermediate core filler.
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice."  Bill Cosby
"Never argue with an idiot. They bring you down to their level and beat you with experience."

This isn't very accurate these days due to various internal density differences used in modern bowling balls, but it's a rough guide.

http://www.jayhawkbowling.com/Pro_s_Corner/Pro_Shop_Forms/weightremoval.pdf
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"A word to the wise ain't necessary -- it's the stupid ones that need the advice."  Bill Cosby
"Never argue with an idiot. They bring you down to their level and beat you with experience."