Bowling ball core · Brunswick

Brunswick Rampart Core

The core inside the Brunswick Combat line

An asymmetric core with mid-lane rev-up and high flare, built for medium to heavy oil. 2 of the 3 balls with this core are in stock at BowlersMart.

  • Asymmetric
  • RG 2.502
  • Diff 0.051
  • MB 0.019
Brunswick Rampart symmetric core shape inside the ball

Specs

RG AT 15 LB

2.502

Mid-lane rev-up

Revs soonerRevs later

52% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.051

High flare

Less flareMore flare

68% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

0.019

Strong asymmetry

MilderStronger

75% of the asymmetric reactive and urethane balls we stock have a lower mass bias.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
Brunswick Rampart Core specs by ball weight (reference ball: Brunswick Combat Solid)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.515 0.043 0.016
15 lbUsed on this page 2.502 0.051 0.019
14 lb 2.513 0.051 0.019
13 lb 2.597 0.041 0.014
12 lb 2.593 0.041 0.014

Source: Brunswick published specs, as listed on the Brunswick Combat Solid product page. RG and differential change with ball weight; use the row for the weight you throw. The highlighted 15 lb row is the one used on this page.

Balls with the Brunswick Rampart Core

2 of the 3 balls with the Brunswick Rampart Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Solid covers

Solid covers grip the lane soonest and suit heavier oil.

Brunswick Combat Solid Bowling Ball

Brunswick Combat Solid

Brunswick Alpha Premier Solid HK22C2 Reactive

Medium to heavy oil

Sale price $194.95 Regular price $289.95In stock

Hybrid covers

Hybrid covers mix solid grip with pearl length.

Brunswick Combat Hybrid Bowling Ball

Brunswick Combat Hybrid

Brunswick Alpha Premier Hybrid Reactive

Medium to heavy oil

Sale price $169.95 Regular price $289.95In stock
Show 1 ball no longer available at BowlersMart
More bowling balls with the Brunswick Rampart Core
Ball Cover First seen
Brunswick Combat Bowling Ball Brunswick Alpha Premier Pearl Reactive June 2025

Shop the 2 available balls with this core

Where the Brunswick Rampart sits

Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.

DV8 Larceny Core, RG 2.471, diff 0.028DV8 Renegade Core, RG 2.499, diff 0.040Track I-Core Gen4, RG 2.480, diff 0.053Brunswick Vintage Light Bulb Low RG Core, RG 2.568, diff 0.032Brunswick Dual Centric Core, RG 2.509, diff 0.047Ebonite Big Time Core, RG 2.508, diff 0.054Hammer Stacked LED Core, RG 2.545, diff 0.047Hammer Vindicator Core, RG 2.474, diff 0.053Radical Vexed Variant Asymmetric Core, RG 2.490, diff 0.045Radical Modified Intel Symmetric Core, RG 2.483, diff 0.032Motiv Affliction V2 Core, RG 2.480, diff 0.055Storm Element Tour A.I. Core, RG 2.470, diff 0.035900 Global Conduit A.I. Core, RG 2.590, diff 0.050Roto Grip GEM A.I. Core, RG 2.490, diff 0.057Hammer Obsession Tour Core, RG 2.469, diff 0.034Hammer Super Offset Core, RG 2.524, diff 0.053Hammer Gas Mask Core, RG 2.500, diff 0.058Ebonite Turbo Core, RG 2.517, diff 0.040Ebonite Centrex Symmetrical Mass Bias Core, RG 2.466, diff 0.056Motiv Excel Core, RG 2.550, diff 0.030Motiv Detonator Core, RG 2.470, diff 0.055Storm Solarion A.I. Core, RG 2.480, diff 0.054SWAG Insanity Symmetric Core, RG 2.520, diff 0.034SWAG Fusion Core, RG 2.540, diff 0.036SWAG Watcher Symmetric Core, RG 2.510, diff 0.048SWAG Dragon Asymmetric Core, RG 2.490, diff 0.050Motiv Predator V2 Core, RG 2.470, diff 0.054Storm C3 Centripetal Control Core, RG 2.490, diff 0.029Roto Grip Rondure MaxD Core, RG 2.500, diff 0.058Hammer Vibe Core, RG 2.510, diff 0.042Hammer Aftermath Core, RG 2.520, diff 0.052Brunswick Alert Core, RG 2.478, diff 0.037DV8 Collision Core, RG 2.462, diff 0.052Track MC2 Asym Core, RG 2.473, diff 0.046Radical Evil Eye Symmetric Core, RG 2.495, diff 0.046Ebonite Iron Fist V2 Core, RG 2.473, diff 0.053Radical No Doubt Symmetric Core, RG 2.485, diff 0.051Storm Surge Core, RG 2.580, diff 0.024Roto Grip Hyped UP Core, RG 2.500, diff 0.042Brunswick Fury Core, RG 2.524, diff 0.038Motiv Sigma Core, RG 2.470, diff 0.047Roto Grip Hustle Core, RG 2.530, diff 0.030900 Global Blast A.I. Core, RG 2.470, diff 0.055Radical Guru Core, RG 2.503, diff 0.044Track I-CORE 3.0, RG 2.486, diff 0.056Brunswick Infinity Core, RG 2.521, diff 0.051Storm Catalyst A.I. Core, RG 2.480, diff 0.053Hammer Raw Hammer Core, RG 2.537, diff 0.038Storm Atmos A.I. Core, RG 2.530, diff 0.042Storm Booster Core, RG 2.540, diff 0.046Track Shuttle Core, RG 2.480, diff 0.040Brunswick Light Bulb Core, RG 2.524, diff 0.030Radical Sneak Attack Core, RG 2.544, diff 0.036Motiv Gear Core, RG 2.480, diff 0.034Hammer Huntsman Core, RG 2.470, diff 0.050Hammer Super LED Core, RG 2.632, diff 0.034Ebonite Enhanced V2 Core, RG 2.480, diff 0.048DV8 Dualistic Core, RG 2.496, diff 0.045Radical Vexed Asymmetric Core, RG 2.498, diff 0.036Motiv Quadfire Core, RG 2.550, diff 0.043Track Stealth Core, RG 2.482, diff 0.056Brunswick Tiered Hexagon Core, RG 2.540, diff 0.045Columbia 300 Piranha Core, RG 2.554, diff 0.043Storm Torsion A.I. Core, RG 2.470, diff 0.050Storm Element Max A.I. Core, RG 2.470, diff 0.055Storm Radius Core, RG 2.610, diff 0.020Roto Grip Rondure Tour X Core, RG 2.480, diff 0.034SWAG Unreal Core, RG 2.510, diff 0.047SWAG Craze Core, RG 2.520, diff 0.030SWAG Serpent Asymmetric Core, RG 2.510, diff 0.048Radical Torpedo Asymmetric Core, RG 2.480, diff 0.052Motiv Overload Core, RG 2.480, diff 0.050DV8 Duality Core, RG 2.480, diff 0.036Hammer Spheroid Core, RG 2.480, diff 0.048Motiv Apex Predator Core, RG 2.520, diff 0.055Brunswick Danger Zone Core, RG 2.501, diff 0.048Storm RAD-TQ Core, RG 2.560, diff 0.051Storm Velocity Core, RG 2.480, diff 0.051Hammer Modified LED Core, RG 2.586, diff 0.027Epic Spark Core, RG 2.540, diff 0.049Motiv Hadron Dual Density Core, RG 2.500, diff 0.045Track Criterion ID Core, RG 2.496, diff 0.047Brunswick Zone Asymmetric Core, RG 2.478, diff 0.048Ebonite Entity Core, RG 2.515, diff 0.052Roto Grip Rocker A.I. Core, RG 2.480, diff 0.050Motiv Flux Core, RG 2.570, diff 0.015DV8 Mantra Core, RG 2.498, diff 0.047Hammer Gas Mask Low Diff Core, RG 2.500, diff 0.034Roto Grip RST A.I. Core, RG 2.520, diff 0.055Motiv Impulse V2 Core, RG 2.550, diff 0.050SWAG APX V1 Core, RG 2.500, diff 0.042SWAG Judge Core, RG 2.490, diff 0.052900 Global Magna A.I. Core, RG 2.490, diff 0.044Columbia 300 Pulse PowerCOR Core, RG 2.468, diff 0.045KR Strikeforce Launch Core, RG 2.530, diff 0.047900 Global Ellipse Asymmetric A.I. Core, RG 2.480, diff 0.050Motiv Halogen Core, RG 2.550, diff 0.037Storm C3 A.I. Core, RG 2.480, diff 0.031Motiv Gear APG Core, RG 2.470, diff 0.036Radical Snapshot Symmetric Core, RG 2.523, diff 0.050Hammer High Rev Offset Core, RG 2.489, diff 0.053Hammer Huntsman Tour Core, RG 2.472, diff 0.036Hammer LED Core, RG 2.650, diff 0.015Storm Inverted Fe2 Core, RG 2.570, diff 0.046Storm Capacitor Core, RG 2.570, diff 0.022SWAG Executioner Asymmetric Core (pictured: SWAG Executioner Solid Bowling Ball)1DV8 Unholy Core (pictured: DV8 Heckler Hybrid Bowling Ball)2Radical Outer Limits Asymmetric Core (pictured: Radical Outer Limits Black Hole Bowling Ball)3Hammer Gauntlet Core (pictured: Hammer Spawn Bowling Ball)4Roto Grip Morph-Wing Core (pictured: Roto Grip Transformer Bowling Ball)5900 Global Strobe A.I. Core (pictured: 900 Global Viking Bowling Ball)6Brunswick Rampart Core (pictured: Brunswick Combat Solid Bowling Ball)EARLY REV-UPMID-LANELATER REV-UPHIGH FLAREMEDIUMLOW FLARE2.442.482.522.562.602.642.680.0100.0200.0300.0400.0500.060RG at 15 lbDifferential at 15 lb← Revs up soonerRevs up later →More flare ↑Less flare ↓

Nearest cores, zoomed in

Hover or tap a dot for that core’s numbers. Click a dot to open its page. Drag to move around when zoomed in. The same RG and differential do not guarantee the same ball motion.

This core 1 Nearest cores Other cores

Nearest cores to the Brunswick Rampart Core
Core Brand Shape RG Diff vs this core
SWAG Executioner Solid Bowling Ball1SWAG Executioner Asymmetric CorePictured: SWAG Executioner Solid
 SWAG Asymmetric 2.500 0.051 RG −0.002 · Diff 0.000
DV8 Heckler Hybrid Bowling Ball2DV8 Unholy CorePictured: DV8 Heckler Hybrid
 DV8 Asymmetric 2.504 0.051 RG +0.002 · Diff 0.000
Radical Outer Limits Black Hole Bowling Ball3Radical Outer Limits Asymmetric CorePictured: Radical Outer Limits Black Hole
 Radical Asymmetric 2.499 0.051 RG −0.003 · Diff 0.000
Hammer Spawn Bowling Ball4Hammer Gauntlet CorePictured: Hammer Spawn
 Hammer Asymmetric 2.501 0.050 RG −0.001 · Diff −0.001
Roto Grip Transformer Bowling Ball5Roto Grip Morph-Wing CorePictured: Roto Grip Transformer
 Roto Grip Asymmetric 2.510 0.051 RG +0.008 · Diff 0.000
900 Global Viking Bowling Ball6900 Global Strobe A.I. CorePictured: 900 Global Viking
 900 Global Asymmetric 2.510 0.052 RG +0.008 · Diff +0.001

Matches use 15 lb RG and differential.

Drilling and tools

Brunswick drill sheetsLayout guides for symmetric and asymmetric ballsDual angle converterTurn a pin to PAP layout into a dual angle layout

Turn on JavaScript to compare with your ball.Balls with the Brunswick Rampart Core2 of the 3 balls with the Brunswick Rampart Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.Solid coversSolid covers grip the lane soonest and suit heavier oil.

From Brunswick’s description

Questions bowlers ask

What is the RG of the Brunswick Rampart Core?

At 15 lb the Brunswick Rampart Core has an RG of 2.502. It ranges from 2.502 to 2.597 across the listed weights.

What is the 14 lb RG of the Brunswick Rampart Core?

At 14 lb the RG is 2.513.

What is the differential of the Brunswick Rampart Core?

At 15 lb the differential is 0.051. The mass bias is 0.019.

Which bowling balls use the Brunswick Rampart Core?

Brunswick Combat Solid Bowling Ball, Brunswick Combat Hybrid Bowling Ball, Brunswick Combat Bowling Ball. 2 are in stock now.

How do the Brunswick Rampart Core specs change by weight?

At 16 lb: RG 2.515, differential 0.043, mass bias 0.016. At 12 lb: RG 2.593, differential 0.041, mass bias 0.014.

How does the Brunswick Rampart Core compare with my ball?

Type the ball you throw into the Compare with your ball box on this page. It shows the RG and differential side by side and saves your bag for every core page.

Sources and method

Specs. Brunswick published specs, as listed on the Brunswick Combat Solid product page, as published by the manufacturer.

Baseline. The baseline is 212 in-stock, published reactive and urethane balls. Plastic and polyester covers, 2-piece, 3-piece and pancake cores, missing covers and missing RG or differential values are excluded.

Percentiles. Percentiles are the share of baseline balls with a strictly lower or higher value; ties are not counted.

Nearest cores. Nearest cores are ranked by distance on standardized 15 lb RG and differential, with the same symmetric or asymmetric shape preferred among near ties (distance bands of 0.1).

Mass bias. Mass bias is compared among asymmetric balls with numeric mass bias only.

Updated. Catalog and page updated 2026-10-16.

Next lesson

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