There's a cap on the maximum damage you can do via attacking with weapons on p99, and it's calculated on a level range basis. It is as follows:
levels 1-9 - damage cap is 20
levels 10-19 - damage cap is 28
levels 20-29 - damage cap is 60
levels 30+ - no cap
This overrides the normal max damage calculation (2 * weapon damage). So to avoid having your damage capped prematurely capped, you want to use a weapon with:
levels 1-9 - up to 10 dmg
levels 10-19 - up to 14 dmg
levels 20-29 - up to 30 dmg
levels 30+ - as much as you want
Suffice to say, I'd hold off on the Bone Bladed Claymore til 20. Also, everything JimJam said
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