Bowling ball core · Storm
Storm Booster Core
The core inside the Storm Rocket line
A symmetric core with later rev-up, more length and medium flare, built for medium oil. 1 of the 6 balls with this core are in stock at BowlersMart.
- Symmetric
- RG 2.540
- Diff 0.046

Specs
RG AT 15 LB
2.540
Later rev-up, more length
82% of the reactive and urethane balls we stock have a lower RG.
DIFFERENTIAL AT 15 LB
0.046
Medium flare
44% 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.
| Weight | RG | DifferentialDiff | Mass biasMB |
|---|---|---|---|
| 16 lb | 2.530 | 0.044 | None |
| 15 lbUsed on this page | 2.540 | 0.046 | None |
| 14 lb | 2.550 | 0.048 | None |
| 13 lb | 2.590 | 0.045 | None |
| 12 lb | 2.650 | 0.035 | None |
Source: Storm published specs, as shown on BowlersMart’s original Storm Booster core page (2022). 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 Storm Booster Core
1 of the 6 balls with the Storm Booster Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Storm A1S Pearl Reactive
Medium oil
Show 5 balls no longer available at BowlersMart
| Ball | Cover | First seen |
|---|---|---|
| Storm Rocket AI Pro Pin Bowling Ball | Storm A1S Pearl Reactive | June 2026 |
| Storm Rocket Bowling Ball | Storm R2S Hybrid Reactive | January 2015 |
| Storm Sky Rocket Bowling Ball | Storm R2S Pearl Reactive | May 2015 |
| Storm Rocket Ship Bowling Ball | Storm R2S Solid Reactive | May 2016 |
| Storm Rocket Booster Overseas Bowling Ball | Storm R2S Hybrid Reactive | January 2020 |
Where the Storm Booster sits
Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
Nearest cores, zoomed in
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
This core 1 Nearest cores Other cores
| Core | Brand | Shape | RG | Diff | vs this core |
|---|---|---|---|---|---|
|
|
Brunswick | Symmetric | 2.540 | 0.045 | RG 0.000 · Diff −0.001 |
|
|
Hammer | Symmetric | 2.545 | 0.047 | RG +0.005 · Diff +0.001 |
|
|
Epic | Symmetric | 2.540 | 0.049 | RG 0.000 · Diff +0.003 |
|
|
KR Strikeforce | Symmetric | 2.530 | 0.047 | RG −0.010 · Diff +0.001 |
|
|
Columbia 300 | Symmetric | 2.550 | 0.043 | RG +0.010 · Diff −0.003 |
|
|
Motiv | Symmetric | 2.550 | 0.043 | RG +0.010 · Diff −0.003 |
Matches use 15 lb RG and differential.
Drilling and tools
Equipped with a mid-range RG and moderate differential value, the Booster Core offers excellent value for a mid-line ball. Because of its long and continuous motion, the Booster Core has been sought after by bowlers of all styles. Should this amount of hook be available at this price? We think so.
Questions bowlers ask
What is the RG of the Storm Booster Core?
At 15 lb the Storm Booster Core has an RG of 2.540. It ranges from 2.530 to 2.650 across the listed weights.
What is the 14 lb RG of the Storm Booster Core?
At 14 lb the RG is 2.550.
What is the differential of the Storm Booster Core?
At 15 lb the differential is 0.046. This is a symmetric core, so mass bias is not applicable.
Which bowling balls use the Storm Booster Core?
Storm Rocket AI Bowling Ball, Storm Rocket AI Pro Pin Bowling Ball, Storm Rocket Bowling Ball, Storm Sky Rocket Bowling Ball, Storm Rocket Ship Bowling Ball. 1 are in stock now.
How do the Storm Booster Core specs change by weight?
At 16 lb: RG 2.530, differential 0.044. At 12 lb: RG 2.650, differential 0.035.
How does the Storm Booster 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. Storm published specs, as shown on BowlersMart’s original Storm Booster core page (2022), as published by the manufacturer.
Baseline. The baseline is 265 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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