Brunswick Battering Siege Bowling Ball


SKU: 60-105262-93X Categories: ,
Core TypeMACE
Finishing Steps1,000-Grit Siaair Pad Finish
RG Max2.546
RG Min2.490
RG Differential0.056
RG Average2.8 / 10Center Heavy (1 – 10) Cover Heavy
Hook Potential170 / 250Low (10 – 250) High
Length100 / 235Early (25 – 235) Long
Breakpoint Shape85 / 150Smooth Arc (10 – 150) Angular Arc

Propel Coverstock

Propel™ is a evolutionary coverstock developed by Brunswick to improve the mid-lane and
backend traction of the ball on today’s slicker oils and lane surfaces. The Propel coverstock
was discovered through testing of new formulation additives and process changes in
coverstock manufacturing.


Mechanical Asymmetric Core Engineering. The MACE core has three major benefits: ultra
low RG core system to engage the Propel coverstock, high RG differential to aid in traction
through heavy oil and high RG asymmetric differential to quicken the response time to friction.
Designed as a two-component elliptical core system, the MACE core is dynamically the
strongest asymmetric core ever produced for a Brunswick ball.

Ball Motion

The Battering Siege™ unites the Propel coverstock and the MACE core to produce a ball motion
that is both aggressive in the oil and aggressive on the backend. The Battering Siege is your ball
when your game needs help battling heavy oil conditions and poor pin action.

Reaction Setup

The Battering Siege can be drilled using the standard drilling techniques developed for
asymmetric bowling balls. Please visit to view the
drilling instructions for specific reaction characteristics and layout details.

Lightweight Engineering

The unique core shape of each Brunswick ball is used for weights from 14 to 16 pounds.
This approach to lightweight ball engineering provides bowlers with consistent ball reaction
characteristics across this weight range. The same drilling instructions can be used for
12- and 13-pound balls. This is because Brunswick uses a generic core shape with an
RG differential that is close enough to the 14-16 pound shape.


12 lbs (pounds), 13 lbs (pounds), 14 lbs (pounds), 15 lbs (pounds), 16 lbs (pounds)




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