Take a look at these pellets. Same or different? Can you guess the brand on the left in second picture, and the brand on the right?
JSB pellet variance can-to-can
- Thread starter Daxx
- Start date
For you to name two different pellet brands you must think there is a difference?
Acutally, the pellet on the left is a JSB Exact King and the pellet on the right is a JSB Exact King.
I have Four cans of these and the first can I opened the pellets were ALL like the one on the left. The second can I opened the pellets were ALL like the ones on the right. So not so "exact" die-to-die. I see quite a bit of variance. Unfortunately I shot up the first can before noticing, so I can't really test the difference now. I can tell you the first can (pellet on left) had many more bent up skirts and deformations.
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The first thing that is really noticeable is the difference in skirt thickness, the other noticeable difference is the diameter of the punch at the bottom is a lot bigger on the left pellet.
Linsfreak, I noticed the difference immediately when I opened a new can, I just happened to have a couple of pellets left from the first can for pictures, so I cannot get a good test. And I just tuned my gun, so the results would be skewed.
Linsfreak, I noticed the difference immediately when I opened a new can, I just happened to have a couple of pellets left from the first can for pictures, so I cannot get a good test. And I just tuned my gun, so the results would be skewed.
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Kris, this is all there is. I don't see batch numbers. I also looked inside the can and under the foam padding.
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One of my JSB pellet cans has a rectangular sticker under the round sticker on the bottom of the can. I believe the rectangular stickers provide more details regarding the pellets and matches up with data found on website kris has link to above.
Check out this thread: http://airgunnation.dev/topic/jsb-heavy-diabolo-head-size/
Check out this thread: http://airgunnation.dev/topic/jsb-heavy-diabolo-head-size/
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I measured the last can of 15.89's I got and they were 75% 5.55mm heads!! The rest were 5.54. Usually they are mostly 5.52 with some percentage of 5.53 and 5.51 depending on the batch.
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To me that is the sort of thing that may well explain those flyers that seem to "Just Happen" out of nowhere.
I wonder what level of QC we can afford?
I wonder what level of QC we can afford?
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Regardless of slight changes in die stamp, the .22 JSBs are all batch tested and the pass standard is 50 yard groups of 16 mm and under for .22s and 12 mm for .177s average for 5 groups in a tunnel. If batches don't pass that test they don't get out of the factory. ... I know no other pellet maker who has any such standard.
Some batches will shoot better than others. I think the factory uses AA and Daystate rifles for testing but there may be others. Every manufactured item has a tolerance. .
Presently I have some H@N .177 Baracudas which are shooting exceptionally well, stamped 4.50 mm and last week had groups down to 0.18 " at 50 yards at 20 fpe from my TM 1000 and LW barrel. Have not seen H@N that good before.
If you want to make some comparisons, buy a tin of Gamos ! ... Kind regards, Harry.
Some batches will shoot better than others. I think the factory uses AA and Daystate rifles for testing but there may be others. Every manufactured item has a tolerance. .
Presently I have some H@N .177 Baracudas which are shooting exceptionally well, stamped 4.50 mm and last week had groups down to 0.18 " at 50 yards at 20 fpe from my TM 1000 and LW barrel. Have not seen H@N that good before.
If you want to make some comparisons, buy a tin of Gamos ! ... Kind regards, Harry.
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There are different size heads in the JSB tins i got. 5.52, 5.53,5.54,5.55, and 5.56's so i would have to say they are all not EXACT.
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With the new tin (of JSB 18.13gr) there are more flyers at 25meters so started weighing. Both new tins have a weight range from 17.90gr to 18.51gr.
Next to measure the pellets head diameter and skirt lengths and diameter.
Also, 12 or so pellets drop fully without any resistance in the FX Impact mag but 5-6 in the middle of the mag tend not to. Maybe mags issue as its almost always the same slots in all 3 mags. A few lead shavings in each mag as well now.
Next to measure the pellets head diameter and skirt lengths and diameter.
Also, 12 or so pellets drop fully without any resistance in the FX Impact mag but 5-6 in the middle of the mag tend not to. Maybe mags issue as its almost always the same slots in all 3 mags. A few lead shavings in each mag as well now.
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Daxx
Can to can? I have some 25 cal Kings with similar variance in the same can. They seem to shoot well and I get to blame the pellets when I miss.
Can to can? I have some 25 cal Kings with similar variance in the same can. They seem to shoot well and I get to blame the pellets when I miss.
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Yes there was a distinct difference from one can to another. That's the reason I didn't notice until I opened the second can.
Someone mentioned they get tested before leaving the factory, but I don't care what kind of test you run, if they are visibly different, then there is a change. Bullets, pellets, should always be the same for accuracy. Just because the change doesn't affect the poi of the guns the factory tests with doesn't mean it won't affect all the other guns out there.
Another comment was to compare Gamo to JSB. I don't expect variance in my high end pellets just because there are cheaper, worse pellets out there.
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I separated 18.1 grain JSB Exact Heavy 0.22 pellets by head size using a PelletGage and found no flyers with head sizes from 5.50 to 5.53. This was with a Daystate Pulsar on High power at 35 ft-lb.
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My JSB Kings, bought 2 weeks ago, have a hexagonal imprint on their bottoms. Batch number? 52061416.
My AA Field .25 sample, also bought 2 weeks ago, have thick skirts, similar to your right hand pellet, and they have a shorter bevel (just under the skirt).
They both weigh 1.64-1.66g
My AA Field .25 sample, also bought 2 weeks ago, have thick skirts, similar to your right hand pellet, and they have a shorter bevel (just under the skirt).
They both weigh 1.64-1.66g
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This gives some sort of idea of what varying pellet head size does. 25m distance. No change in zero, sim middle of target.
Awaiting delivery of 5.53 JSB 18gr as 5.52 (& 5.54) are not doing do well out of the FX ST barrel.
FX 16gr pellet tin says 5.52 but majority are 5.53. sorted some out on pelletgage and results below.
Pulled one (top hole) in the middle 10 shot 5.53 group and without it the group is 12.8mm.
Awaiting delivery of 5.53 JSB 18gr as 5.52 (& 5.54) are not doing do well out of the FX ST barrel.
FX 16gr pellet tin says 5.52 but majority are 5.53. sorted some out on pelletgage and results below.
Pulled one (top hole) in the middle 10 shot 5.53 group and without it the group is 12.8mm.
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