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JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

Overview
Testers

Doug Wall

Caliber

.22

Model Number

N/a

Test Date

September 3, 2018

Serial Numbers

N/a

Source of Supply

Supplied by Predator International

Condition

New

We Like

High quality.
Great value.
Strong impact downrange.

We Don't Like

Please can we have screw-top tins!
Need a powerful air rifle.
Not much else.

HAM Rating
Comparison to Makers Claims
90%
Most Common Head Diameter
50%
Variation in Head Diameter
70%
Most Common Weight
70%
Variation in Weight
60%
Most Common Length
90%
Variation in Length
60%
Dirtiness
90%
Hard Air Magazine Test Conclusions

JSB Exact Jumbo Heavy 18.13 Grain pellets are well-priced and give excellent quality of manufacture. It's easy to see why they win a coveted HAM Gold Award!

These pellets would be ideal for airgun hunting with a powerful PCP air rifle. But they're probably somewhat heavy for a mid- or low-power springer, resulting in a rather elliptical trajectory with lower powered air rifles.

JSB pellets have a great reputation for accuracy. If your gun likes these pellets and has enough power, why look further?

71%
HAM Rating
You have rated this
Full Review

VALUE FOR MONEY

JSB Exact Jumbo Heavy 18.13 Grain pellets are a high quality pellet from the famous Czech manufacturer. As we can see from the chart below, they’re not much more expensive than the Median (average) price for .22 caliber lead pellets at just 4.40 cents each in a 250 count tin. This makes them excellent value for money.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

In fact, if they are purchased in a 500 count tin, the price per pellet falls to just 3.70 Cents each, actually below the Median price per pellet. Predator International, the US distributor of JSB products, says these are their best-selling .22 caliber pellets. It’s easy to see why!

BUY FROM PYRAMYD AIR
JSB Match Diabolo Exact Jumbo Heavy .22 Cal, 18.13 Grains, Domed, 250ct
BUY FROM AIRGUN DEPOT
JSB Jumbo Heavy 18.13 Grain 250 Count

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

 

TEST DATA SUMMARY

Price per Pellet4.40 cents
Most Common Weight18.15 Grains
Pellets at That Common Weight18%
Variation in Pellet Weight (Smallest to Largest)2.23%
Most Common Head Diameter5.52 mm
Pellet at That Common Head Diameter54%
Variation in Head Diameter (Smallest to Largest)0.36%
Most Common Length7.77 mm
Pellets at That Common Length38%
Variation in Length (Smallest to Largest)1.81%

 

COMPARISON TO MAKERS CLAIMS

The manufacturer claims that JSB Exact Jumbo Heavy pellets have a weight of 18.13 Grains. The sample of these pellets tested by HAM gave an average of 18.15 Grams – just 1.1% less than the specification.

HAM found that there were 249 pellets in the tin we tested. One short of the claim. In our experience, this is very unusual and we wouldn’t get too excited about it.

Head diameter is given as a nominal 5.5 mm. In fact, the average – and most common – head diameter of the JSB Exact Jumbo Heavy 18.13 Grain pellets tested by HAM was actually 5.52 mm.

JSB does not publish Ballistic Coefficients for its pellets. However, HAM testing established a BC of 0.035 for these pellets.

 

CONSISTENCY

No damaged pellets were found in the tin of JSB Exact Jumbo Heavy 18.13 Grain pellets.

As we can see below, head diameter was well controlled, with 54% measuring 5.52 mm in the sample of 50 pellets tested by HAM. This is good consistency from the price being asked.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

As usual, weight was somewhat more variable. The most common weight per pellet was 18.15 Grains, with 18% of the pellets tested having that weight.

The variation between the lightest and heaviest JSB Exact Jumbo Heavy pellets tested was 2.23%. This is rather better than average, based on HAM’s highly standardized, precise test protocol.

As always, all weights are measured using on Hard Air Magazine’s incredibly-precise, laboratory-grade milligram balance. This is so sensitive that it even registers a person’s breath! That’s where HAM tester Doug Wall’s many years of research laboratory experience is vital for achieving such accurate measurements…

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

Normally in HAM testing, we find that pellet lengths are the least consistent. However, the JSB Exact Jumbo Heavy 18.13 Grain pellets showed good length consistency. As many as 38% of the tested pellets had a length of 7.77 mm. This is a very high figure!

The difference between the shortest and longest pellets tested by HAM was 1.81%. Again, this was a good result.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

 

DIRTINESS

The JSB Exact Jumbo Heavy 18.13 Grain pellets tested by HAM had a total of 0.160 Grains of dirt per 100 pellets. Again, this is a good (low) figure.

Some residual dirt and dust is an inevitable part of manufacturing any lead pellets and a certain amount of it inevitably finds its way into the tin. The photograph below shows the amount of this “junk” which resulted from carefully washing these pellets.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

 

DOWNRANGE PERFORMANCE

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

As usual, the HAM Team has used the Chairgun ballistic software application to derive the downrange performance of JSB Exact Jumbo Heavy 18.13 Grain pellets.

As we can see, the relatively low power of our “1,000 FPS standard” Beeman 1074 air rifle, gave a rather curved trajectory. However, this would be much improved with a more powerful gun.

Sighting-in at 30 Yards gives effectively “flat” shooting from 9 to 33 Yards.

 

HUNTING USE

The high Ballistic Coefficient of 0.035 means that JSB Exact Jumbo Heavy 18.13 Grain pellets slow down gradually with distance. This means that they retain a considerable amount of energy downrange. In fact as much as 70% of the Muzzle Energy is still retained by the pellet as far out as 55 yards downrange.

Combined with the relatively-high his means that these are a great choice for airgun hunting in .22 caliber.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

Penetration into our standard ballistic soap block was a long 46mm using the Beeman 1074 air rifle. The diameter of the entry hole was 7.0 mm.

The photograph below shows the fired pellet after extraction from the soap – right. As we can see compared to an unfired pellet, the head diameter increased from 5.52 mm to 5.58 mm. At the same time, the length shortened from 7.78 mm before firing to 7.49 mm.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

 

BUYING AND OWNING

JSB Exact Jumbo Heavy 18.13 Grain pellets are readily available online, although you’re less likely to find them in a big box sporting goods store.

The pellets are well-protected in transit by a foam disk in the top of the tin. However – as always – we struggle with JSB’s standard push-top tins. A screw top would be much appreciated by most shooters, we believe.

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

 

TEST DATA

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

JSB Exact Jumbo Heavy 18.13 Grain .22 Caliber Pellet Test Review

For background details on HAM’s Pellet Test Review methodology, check out this link.

Chairgun is a product of Hawke Sports Optics LLC and is used with permission. Check out http://www.hawkeoptics.com

BUY FROM PYRAMYD AIR
JSB Match Diabolo Exact Jumbo Heavy .22 Cal, 18.13 Grains, Domed, 250ct
BUY FROM AIRGUN DEPOT
JSB Jumbo Heavy 18.13 Grain 250 Count

Understanding HAM Pellet Awards

HAM Pellet Awards come from the most rigorous, professional and comprehensive pellet testing by any independent publication. They are the result of much precise measurement and analysis using high precision measuring devices and highly-experienced testers.

Note that accuracy is a product of the complete “system” of airgun, scope, atmospheric conditions and shooter ability – not the pellet alone.

This means that no pellet test review can predict the accuracy of a particular pellet with YOUR individual air rifle. That’s why we do not measure accuracy in these pellet tests.

What HAM Pellet Awards do recognize is manufacturing consistency. Inconsistent pellets definitely will be inaccurate, consistent pellets are much more likely to be accurate.

HAM Awards also recognize value. There’s considerable variation in the price of airgun pellets. This means that an 8 cent pellet needs to score higher than a 2 cent pellet to achieve an award.

For full details of the HAM Pellet Award scoring methodology, please check out our Pellet Testing page.

For a full listing of HAM-tested Ballistic Coefficients, please see our Ballistic Coefficients page.

This entire article including scoring, data etc is Copyright Hard Air Magazine and may NOT in part or in whole be reproduced in any electronic or printed medium without prior permission from the publisher.