I think a pellet is a pellet - within reason.

This in no way equates JSB with H&N or Benjamin , predator , or others. This example is strictly JSB products . Notably JSB , FX , Edgun JSB , AA pellets. I have sorted thousands of pellets in the 25 cal 25.3 - 25.4g as well as the 33.9-34g weights. Using pellet gage , these pellets ALL come in head sizes of 6.36 - 6.39 mm with THE vast majority falling into 6.37 - 6.38 mm . Now i have seen less variation in skirt thickness between different " brands" than from different tins in the same batch of one brand. I also notice that each tin of FX or Edgun JSB have a tighter variance of size Than regular JSB does. Does that mean they will shoot better in your gun? Not necessarily , your gun has a head size preference , period. every FX barrel i have had enjoyed a specific pellet size just as my LW barrels did. It's just that FX barrels seem to have more flexibility with different head size pellets. 

But , back to the pellets , I whole heartedly believe you can purchase any of these brands , and some will shoot better or worse because of the predominent head size contained within that specific tin regardless of brand label. If you sort them based on head diameter , I feel that they will ALL shoot the same to each other. The variable head diameters contained in each tin accounts for the spread on a grouping or fliers. I believe you can mix all these brands together as long as they are sorted by head diameter , as well as weight , and you will have very consistent ammo. I don't think there is ANY difference between all these JSB products. 

Now i have NOT had the chance to prove this , but from studying the appearance and measurements of diameter and weight and spotting no significant differences. I stand behind this claim. Now if there are other serious pellet folks out there , which I'm sure there are , I welcome your findings.
 
My observations have been that consistency of the pellets in a given tin is more important than a specific head size. For example, many barrels will group one tin of pellets with a head size of 5.49mm just as well as a tin of 5.52mm, but never have I had a tin of pellets group well that contains heads varying all over within that range.
 
My observations have been that consistency of the pellets in a given tin is more important than a specific head size. For example, many barrels will group one tin of pellets with a head size of 5.49mm just as well as a tin of 5.52mm, but never have I had a tin of pellets group well that contains heads varying all over within that range.



This sounds logical. Have you seen a poi shift between the 2?


 
Definitely subscribed! ✔️ 😄

Just recently I have been trying to get to the bottom of this....:

🔶 Are the pellets from AA, FX, EDgun, and Daystate pellets

▪simply "rebranded JSB pellets"

▪or are they "pellets with different specs" — meaning a difference in design which is larger than just the unavoidable variances between different dies of the same design?



It seems the answer does not lie in comparing the pellet specs and performance from say an AA can with a JSB can. Because even between cans of the same brand there are differences — because they might come from different pellet dies.



🔶 Instead, it seems we'd need to compare pellet specs and performance of say an AA can manufactured with die no. 43 with a JSB can, also from die no. 43. 

(PyramydAir's habit of selling us JSB pellets with that generic sticker instead of JSB's sticker with the die number are of course obfuscating this greatly, thank you very much.)





🔶 This question has been debated for years and years, the world over. ➔ It seems like by now we should have a clear statement by the manufacturers, right? 🤔

❓ WHO GAINS from keeping airgunners in the dark about whether buying one brand of 15.89-grainers covers it all — or whether one needs to buy and try JSB, and AA, and FX, and EDGun, and Daystate — in order to truly find the best 15.89-grainer for one's gun?



Matthias 
 
Except the number on the tin is a lot number not a die number. According to AEAC's tour video of JSB the lot number is changed every time the spool of wire is changed which seems to average 75,000 pellets.

I am also pretty sure he confirms in the video that AA has their own dies. Whether they are made for them by JSB is not answered.

Anyway that is my recollection, but here is the video link:

https://www.youtube.com/watch?v=-AAQzSkRZVg
 
This sounds logical. Have you seen a poi shift between the 2?


Yes sir, I almost always see at least some POI difference between different batches...say, a tin of JSB 18.1gr bought 2 years ago and a tin bought last month. They may group equally well (slightly different POI) despite one tin having a nominal head diameter of 5.49mm and the other 5.52mm.


It seems as long as the heads are large enough to at least skate along the surface of the lands (won’t tip in the bore), they have as much opportunity to group well as another batch of pellets large enough to pick up substantial engraving. In fact some of the best-grouping pellets I’ve ever had showed nothing more than slight burnish marks on the heads. No engraving whatsoever.


The skirt alone picks up the necessary spin just fine. 


So I’m much more interested in pellets that are a consistent size than I am with any specific size, within reason. That seems to be where JSB excels, followed closely by RWS and H&N.

I can’t tell you how many times I’ve gotten Crosman pellets that form two distinct groups. They’ve even managed it with their boxed pellets that are supposedly from a single die. Measurements said otherwise.
 
That was my understanding as well. The rebranded JSB’s are assigned there own dies, there not just all mixed together.
Now, weather or not the rebranded versions are being made to different specs? Hard to say.
@Jungleshooter - I agree, I think we could all do without the mystery.

I did notice this on Edguns website. Read into this as much as you like.

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