The King Heavy shoot well for me @ 100 yards (10shots). I have not tried the MK2 version in my 700mm impact. Which version shoots best out of your STX? 
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.25 JSB MK1 or MK2?
- Thread starter bestuse
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MK2 pellets at 100 out of my 700mm STX slug A. Three through the same hole up high. I left them cuz it never happens. Yes it was cherry picked groups usually they looked allot as yours.
You might want to try some MK2s but with it shooting the MK1s like that it's hard to get much better than that with the pellets.
You might want to try some MK2s but with it shooting the MK1s like that it's hard to get much better than that with the pellets.
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Not sure what the differance is I was told one was made more slud like than pellet,,,,
Not sure which one, My Prophet 25 likes the MK 1s at 920 FPS , Have not tried the MK2s yet,
I have been limited to a 48 yard range , Shooting the MK 1s in 25 caliber has turned me off on a 30 caliber gun, The 25 caliber gun hits hard and very very LOUD at 48 yards, Some of my spinning targets I knock over at times, And i have destroyed some of my targets, They were getting old anyway, LOL.
Mike
Not sure which one, My Prophet 25 likes the MK 1s at 920 FPS , Have not tried the MK2s yet,
I have been limited to a 48 yard range , Shooting the MK 1s in 25 caliber has turned me off on a 30 caliber gun, The 25 caliber gun hits hard and very very LOUD at 48 yards, Some of my spinning targets I knock over at times, And i have destroyed some of my targets, They were getting old anyway, LOL.
Mike
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They (MKIIs) shot decent for me at 52. I think the MKI has a thicker skirt than the MKIIs, which the MKII's skirts are able to expand better in the bore when fired. Forgot to add 600mm STX standard at 920 or so.
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I’ve been looking at this for months. A while back JSB screwed up and put Mk1 in Mk2 tins, which made it even more confusing.
The Mk1s have a significantly deeper cavity, thinner skirt and skirt is slightly larger in diameter. The Mk2 has a shallower cavity and thicker skirt. The FX brand heavies are Mk2.
From what I can gather, the .25 Pellet A liner was designed to shoot the Mi2 which is why the FX pellets are Mk2. In my .25 Impact with Slug A liner the gun like the Mk1s better which is also what Ted discovered in his video.
The Mk1s have a significantly deeper cavity, thinner skirt and skirt is slightly larger in diameter. The Mk2 has a shallower cavity and thicker skirt. The FX brand heavies are Mk2.
From what I can gather, the .25 Pellet A liner was designed to shoot the Mi2 which is why the FX pellets are Mk2. In my .25 Impact with Slug A liner the gun like the Mk1s better which is also what Ted discovered in his video.
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I may have forgot which one had the thicker skirts. I ran out of MKIs a good while ago and only have been shooting the MKIIs. I wonder now which ones are better overall. I don't see a detectable difference between my STX and my Superior in .25 cal. shooting JSBs. Only when shooting slugs does the Superior shine more.
I know in .30 cal my STX standard shoots JSBs a lot better than the Slug A does.
I know in .30 cal my STX standard shoots JSBs a lot better than the Slug A does.
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Triggertreat, thanks for the info on Superior liner. My STX shoots better than I can. Slugs maybe down the road.
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