.25 Heavy pellet problem for guns with Poly barrels

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Centercut

Centercut

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https://www.airgunnation.com/topic/jsb-25-king-heavy-problem/

This could turn into a huge issue for all of us present and future that have or want to buy a .25 gun with a Polygonal barrel.
For example, my .25 DW LOVES the .25 King Heavy but has mediocre performance with the Mk2. My .25 Cricket 2 is in the exact same boat. 

The problem is that as far as I can tell and from talking to at least five other shooters that shoot .25 guns with Poly barrels is that JSB has been putting Mk2 heavy in the King Heavy tins and selling them as King Heavy.

An even bigger issue is will JSB actually make the King Heavy Mk1 anymore? Have they been making a mistake or is this a corporate decision?

It would/will suck to have an expensive gun that the correct ammo is no longer made. Perhaps JSB or Predator International will clear this up?
Thanks 

Mike
 
Last year, I purchased several tins of each(.25 JSB King Heavy AND .25 JSB King Heavy MKII)from 2 different large airgun companies. They ALL had the MKII pellets(shallow cavity/thick skirt) inside the tins, no matter what they were marked! Not that one is BETTER than the other, but they shoot markedly different. No one seems to know the difference or care?
 
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I just examined mine and I have seven 300ct. tins with a red sticker on the back with what might be the lot number. These are all King Heavy as marked on the lid. I have three 300ct. marked King Heavy, but are MK 2. These tins have a white label with a bar code on the back. The MK 2 300ct. tins have the white label with a different bar code. I have two 150ct. tins of King Heavy with a bar code that are King Heavy.
 
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.25 JSB King Heavy on left(deep cavity/thin skirt)

.25 JSB King Heavy MKII on right(shallow cavity/thick skirt)

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Thanks Phil. It’s super obvious when you hold them side by side and even more obvious when you shoot them. Yesterday i shot the .25 Cricket2 with Mk2 885 FPS at 50 yards and couldn’t keep it inside a quarter. Shot a magazine of King Heavy Mk1 and it stacked all ten easily inside a dime. Night and day. lol...

I’ll take you up on that deal dizzy, and trade 5 tins of them fancy pellets for a match grade LW barrel machined to perfectly fit my Delta Wolf. Thanks much!!!
 
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I thought it was strange to have 2 pellets made by the same people the same weight, until I finally shot some MKll’s. There was a reason they did it but I can’t remember. It was a while ago but I figured I’d try them when they came out. They definitely shoot different in my guns but seeing as how they don’t have 2 different 18.1’s or 25.39’s, I hope this isn’t a phase out of the originals. Hopefully it was just a mislabeled batch that came to the states. Hopefully someone from across the pond will chime in. I may have to use them some day and my one gun definitely likes the original ones better.
 
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It's been going on for a while, I've got a tin of what's supposed to be MKI but are MKII's I bought months ago. My condor prefers the MKI's.

And depending on who you buy from will depend on if they come packaged well or almost rolling around in the shipping box out of the tin.

I'm not sure what's up with Jsb but the quality control issue of either them or their vendors isn't getting any better.
 
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They are also putting out two types of .22 25.39 redesigned monsters, one of which with a deeper base, info as per Gregor, He is/was finding them less accurate out of the RTI Prophet, a gun designed (in LR configuration) around that pellet.
Click to expand...

The difference here with the .22 RD Monsters is they shifted from the shallow cavity to the deep cavity version. Any that you buy now, unless they are old stock, will be the deep cavity version. My Red Wolf HP didn’t notice the difference. And my Team member Derrick that has a .22 Prophet Performance shoots the deep cavity RD Monsters lights out... That’s good since JSB doesn’t make the shallow cavity versions anymore.
 
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Here’s what I’m going to do, and if we all do this it might effect a change at JSB.

If you order .25 King Heavy (Mk1) and you are sent the Mk2 in the King Heavy tin, RETURN THEM. That is not what you ordered, so you were sent the wrong item.

This will cause all the retailers to also complain to JSB so perhaps we can get them to pull their collective head out of their butt and implement some quality control. 
 
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