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Author Topic: Impact 25 Mag and JSB Kings  (Read 297 times)

ncrary

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Impact 25 Mag and JSB Kings
« on: August 18, 2017, 04:54:27 PM »
The JSB 25s will all drop into the magazine freely.  The MKI heavies drop freely for the first 5 and then they have to be seated (pushed in manually) for the cover to have clearance to rotate.  I can load about 9 pellets this way and have the magazine index while shooting.  More than nine and the magazine will not index.  I only had to "seat" one pellet when I load MKIIs.  I know the skirts on the MKIs are longer than on the other ones but, if there is room to "seat" and the magazine move freely to the next slot, that leads me to believe there is room in the mag for the longer pellets. I'm thinking shouldn't the pellet fall into the magazine?  I wonder if taking a fine sanding disk and “polishing” each of the little compartments in the magazine would solve the problem.  I have seen videos where that is done on the Wildcat mags with goods results.  However, these are expensive magazine and I don’t want to mess one up.  Anyone have similar problems?  What was your solution?


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rsterne

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Re: Impact 25 Mag and JSB Kings
« Reply #1 on: August 18, 2017, 05:46:51 PM »
The skirt on the 34 gr. Heavy Mk.I's is not longer, it is just larger in diameter than the Mk.II's, from my experience.... My guess is that your difficulty in indexing with more than 9 pellets is that because they are a tight fit, they cannot rattle end-wise, and so drag on the end (or side) of the magazine.... Does your gun not shoot well with the Mk.II's ???

Bob
« Last Edit: August 18, 2017, 05:48:23 PM by rsterne »
  • Coalmont, BC

Martin

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Re: Impact 25 Mag and JSB Kings
« Reply #2 on: August 18, 2017, 07:26:07 PM »
Bob, you know all kinds of stuff.  My guess is to free up memory for all that, you have to write your name and address in your underpants so you don't get lost.  One day I hope to know just a little.  For now I will rely on guys like you.  I'm lucky to remember to order the right pellets.
  • Madera CA
Sheridan Silver Streak
Crossman 760
M-rod .25 Gen 1 STOCK
WARP .25 12" barrel

ncrary

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Re: Impact 25 Mag and JSB Kings
« Reply #3 on: August 18, 2017, 09:25:45 PM »
Bob,

The MKIIs fit much better, but I still have to mechanically push one in and it is the same one all the time.  The gun shoots great with  the MKIIs. When I got the 25 cal barrel I ordered two tin of all 3 JSBs to see which ones shoot best.  So far, i like the MKIIs the best, they seem to be more consistent in my gun.

Why would my magazine load the first 5 pellets so loosely and then the rest of them have to be pushed in?  That would leave me to believe that the diameters of the scalloped sections of the mag wheel are not all the same dimension.  It is the same 5 slots all the time.

I will shoot 9 shot groups with the MKIs until they are gone.   ;D

The 25s shoot well enough, but they are not nearly as accurate or consistent as the MKIIs.  So  I will use them for the grandkids when they visit.   8)
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rsterne

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Re: Impact 25 Mag and JSB Kings
« Reply #4 on: August 19, 2017, 08:37:51 AM »
If a Mk.II sticks in the same hole/slot in the magazine every time, my guess is that one is tight....

Does the mag. have slots (like an MRod mag) or holes through it (like a Hatsan mag.).... If slots, then the oversize Mk.I's are likely pushing it over to the opposite side when you load the first 5, and so the remaining ones are tight.... and the drag on indexing is around the outside of the pellets....

Just a WAG.... I would fix the one tight hole/slot and use the Mk.II's....

Bob
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ncrary

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Re: Impact 25 Mag and JSB Kings
« Reply #5 on: August 19, 2017, 06:10:10 PM »
Bob,

It is basically the same as Mrod, except not all plastic.
  • Kennewick, Wa
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rsterne

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Re: Impact 25 Mag and JSB Kings
« Reply #6 on: August 20, 2017, 08:15:53 AM »
Probably dragging on the outside....

Bob
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ncrary

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Re: Impact 25 Mag and JSB Kings
« Reply #7 on: August 23, 2017, 09:30:18 AM »
I took the mag apart and the center wheel with all the scallops passed pellets with no hangups.  So that left the outside case.  I took a Dremel with a sanding wheel and relieved the outside a little and then polished it up.  The mag will now load all three 25 caliber JSBs and cycles nicely.  You would think for $75 for a magazine there would be some checking to make sure it would function with the ammunition the gun was supposedly designed for.
  • Kennewick, Wa
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rsterne

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Re: Impact 25 Mag and JSB Kings
« Reply #8 on: August 23, 2017, 03:19:43 PM »
Oh, you want hand tuning of the magazine?.... That doubles the price, Sir....  ::)

Bob
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