Tell me it’s not true!

JSB still prints the original Mk1 labels at least, but everyone who had ordered the .25 Mk1 heavies in the last year or so has received Mk2 pellets in Mk1 labeled tins. The shipment of Mk1's I received last month were Mk2 pellets in Mk1 tins.

I have 5 tins coming from AoA this week. Will let everyone know if they are real King Heavy or Mk2 in King Heavy tins. 

Thank you. I thought it was my bad shooting until you pointed this out and I started checking my stock. Since I am not a competition shooter and do not sort/weigh pellets, I may have never figured it out.

Just got the .25 King Heavy in today. Good news. They have deeper cavity and slightly thinner skirt than my Mk2. Bad news. They aren’t exactly like the older King Heavy Mk1s. So let’s call these Mik1.5. We’ll see how they shoot this weekend in my .25 Delta Wolf. More to follow.

Just got the .25 King Heavy in today. Good news. They have deeper cavity and slightly thinner skirt than my Mk2. Bad news. They aren’t exactly like the older King Heavy Mk1s. So let’s call these Mik1.5. We’ll see how they shoot this weekend in my .25 Delta Wolf. More to follow.

Click to expand...

Can you post pics, and provide a measurement of the cavity depth? Because they sound different than the king heavies I received just a couple weeks ago which sure look like Mk2's.

The lack of consistency on JSBs part is disappointing...

Here's the king heavies I received a couple weeks ago... New shipment on left, 2018-ish Edgun branded king heavies on the right. Very obvious differences, and what I received certainly aren't Mk1 king heavies.

Will follow up with measurements but this is the photo. Old (Mk1)) King Heavy left, new King Heavy Mk1.5 center, Mk2 on right. Clarity could be better but you can see that the cavity on the Mk1.5 is deeper than the Mk2 but not as deep as the Mk1. I do not know if this affects performance from a polygonal barrel or not. We'll see...

Thanks for the pic, that's clear enough to see the cavity difference. As you said, it's not a mk1, but not a mk2 either, and certainly isn't what I received just a couple weeks ago.

So now there's at least 3 variants of the 33.4s out there... Lol. Sure makes things confusing if your rifle likes only 1 particular variant and you never know what JSB is going to send you.

Hopefully the Mk1.5's work better in your rifle than the Mk2's. I haven't tried my Mk2's (in Mk1 tins) in my R5M yet, ever since I received the new .22 impact M3 last week that's all I have been playing with.

Unfortunately, the Mk1.5 has the same skirt diameter as the Mk2, and NOT the Mk1. Both the Mk1.5 and the Mk2 are 6.60. The Mk1s that I have are 6.68mm. I just measured the three again to confirm. Cavity depth Mk2 is 1.25mm, Mk1.5 is 1.75mm and the Mk1 is 2.20mm. Accuracy testing to follow sometime this weekend... The skirt thickness of the Mk1.5 and the Mk1 are similar, with the Mk2 being noticeably thicker...

Better news. The .25 King Heavy Mk 1.5 shoots as well in my Delta Wolf as the older version King Heavy Mk 1.0. I haven’t tried them yet in my other polygonal barrel gun the .25 Cricket2. Looks like JSB improved their QA and actually listened to the customers…. Thanks JSB!

Good news!

Now the challenge is going to be getting the right pellets in the right tins on future shipments.

I had totally given up on JSB. Returned my last order to Pyramyd and they were kind enough to refund without hassle. 
Mike, this is good news, thanks for testing and posting. So did JSB actually listen? Looks that way.