Bowling ball core · SWAG

SWAG Watcher Symmetric Core

Symmetric SWAG core

A symmetric core with mid-lane rev-up and medium flare, built for medium to heavy oil, medium oil. 1 of the 1 balls with this core are in stock at BowlersMart.

  • Symmetric
  • RG 2.510
  • Diff 0.048
SWAG Watcher symmetric core shape inside the ball

Specs

RG AT 15 LB

2.510

Mid-lane rev-up

Revs soonerRevs later

53% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.048

Medium flare

Less flareMore flare

55% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

None

Symmetric core

Symmetric cores have no mass bias marker to place when drilling.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
SWAG Watcher Symmetric Core specs by ball weight (reference ball: SWAG Unknown Solid)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.490 0.048 None
15 lbUsed on this page 2.510 0.048 None
14 lb 2.540 0.049 None
13 lb 2.580 0.042 None

Source: SWAG published specs, as listed on the SWAG Unknown 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 SWAG Watcher Symmetric Core

1 of the 1 balls with the SWAG Watcher Symmetric Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

SWAG Unknown Solid Bowling Ball

SWAG Unknown Solid

SWAG Mystery Solid AP26

Medium to heavy oil, medium oil

Sale price $149.95 Regular price $249.95In stock

Shop the 1 available balls with this core

Where the SWAG Watcher Symmetric sits

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

Storm Element Tour A.I. Core, RG 2.470, diff 0.035DV8 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 0.032Ebonite 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 0.055900 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 Dragon Asymmetric Core, RG 2.490, diff 0.050SWAG Executioner Asymmetric Core, RG 2.500, diff 0.051Motiv 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 0.037Brunswick Rampart Core, RG 2.502, diff 0.051DV8 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 0.055900 Global Strobe A.I. Core, RG 2.510, diff 0.052Radical Guru Core, RG 2.503, diff 0.044Track I-CORE 3.0, RG 2.486, diff 0.056DV8 Unholy Core, RG 2.504, diff 0.051Brunswick 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 Craze Core, RG 2.520, diff 0.030Radical 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 0.048Radical Outer Limits Asymmetric Core, RG 2.499, diff 0.051Motiv Apex Predator Core, RG 2.520, diff 0.055Storm 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 Unreal Core (pictured: SWAG Unreal Bowling Ball)1SWAG Serpent Asymmetric Core (pictured: SWAG Serpent Hybrid Bowling Ball)2Brunswick Dual Centric Core (pictured: Brunswick Strategy Logic Bowling Ball)3Brunswick Danger Zone Core (pictured: Brunswick Danger Zone Bowling Ball)4Roto Grip Morph-Wing Core (pictured: Roto Grip Transformer Bowling Ball)5Hammer Gauntlet Core (pictured: Hammer Spawn Bowling Ball)6SWAG Watcher Symmetric Core (pictured: SWAG Unknown 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 SWAG Watcher Symmetric Core
Core Brand Shape RG Diff vs this core
SWAG Unreal Bowling Ball1SWAG Unreal CorePictured: SWAG Unreal
 SWAG Symmetric 2.510 0.047 RG 0.000 · Diff −0.001
SWAG Serpent Hybrid Bowling Ball2SWAG Serpent Asymmetric CorePictured: SWAG Serpent Hybrid
 SWAG Asymmetric 2.510 0.048 Same RG and differential
Brunswick Strategy Logic Bowling Ball3Brunswick Dual Centric CorePictured: Brunswick Strategy Logic
 Brunswick Asymmetric 2.509 0.047 RG −0.001 · Diff −0.001
Brunswick Danger Zone Bowling Ball4Brunswick Danger Zone CorePictured: Brunswick Danger Zone
 Brunswick Symmetric 2.501 0.048 RG −0.009 · Diff 0.000
Roto Grip Transformer Bowling Ball5Roto Grip Morph-Wing CorePictured: Roto Grip Transformer
 Roto Grip Asymmetric 2.510 0.051 RG 0.000 · Diff +0.003
Hammer Spawn Bowling Ball6Hammer Gauntlet CorePictured: Hammer Spawn
 Hammer Asymmetric 2.501 0.050 RG −0.009 · Diff +0.002

Matches use 15 lb RG and differential.

Drilling and tools

Drilling layoutsLayout 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 SWAG Watcher Symmetric Core1 of the 1 balls with the SWAG Watcher Symmetric Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

From SWAG’s description

Questions bowlers ask

What is the RG of the SWAG Watcher Symmetric Core?

At 15 lb the SWAG Watcher Symmetric Core has an RG of 2.510. It ranges from 2.490 to 2.580 across the listed weights.

What is the 14 lb RG of the SWAG Watcher Symmetric Core?

At 14 lb the RG is 2.540.

What is the differential of the SWAG Watcher Symmetric Core?

At 15 lb the differential is 0.048. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the SWAG Watcher Symmetric Core?

SWAG Unknown Solid Bowling Ball. 1 are in stock now.

How do the SWAG Watcher Symmetric Core specs change by weight?

At 16 lb: RG 2.490, differential 0.048. The 12 lb values are not listed.

How does the SWAG Watcher Symmetric 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. SWAG published specs, as listed on the SWAG Unknown 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.

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