Blackhorn 209 blowback

Blackpowder72

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Jun 11, 2015
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52
Location
Iowa
I made the switch to BH 209. I'm having serious trouble with blowback in the primer , breech plug. The primer is solid black and I have to pull it out with pliers. I'm shooting a CVA Accura MR , 110 gr powder , Barnes T ez , and Federal 209 A primers ( witch BH recommend ) . Also bought the new BH CVA breech plug . I assume switching primers wI'll fix this problem? Going to try to find some CCI and Winchester.
 

Md reloader

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Apr 22, 2012
Messages
244
I use the same 110gr. with 300 gr. SSTs and CCI209M and have no problems in my CVA. I also use the BH breech plug .
 

ENCORE

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Apr 6, 2011
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Near a lake with no fish
You can try the CCI209M primer, or the WIN209 primer which is the longest of the primers. One other method is to shim out the firing pin to get more crush on the primer. Check with CVA about the blow back problems. I think they have shim kits they'll send you.
 

Bigeclipse

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Aug 10, 2012
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1,935
You can try the CCI209M primer, or the WIN209 primer which is the longest of the primers. One other method is to shim out the firing pin to get more crush on the primer. Check with CVA about the blow back problems. I think they have shim kits they'll send you.
interesting. I was getting stuck primers after switching to BH209 as well but not after just one shot so I simply shoot and then swab the primer hole after each shot. seems to work. I never heard of these shims...where do they go?
 

ENCORE

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Apr 6, 2011
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Near a lake with no fish
interesting. I was getting stuck primers after switching to BH209 as well but not after just one shot so I simply shoot and then swab the primer hole after each shot. seems to work. I never heard of these shims...where do they go?
I'm not a CVA shooter, that said, its my understanding that they go behind the firing pin.
 

26Reload

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Dec 25, 2016
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SE Idaho
I am not a mzldr expert...but I believe the shim for the CVA is an o-ring placed in front of the primer....
If you look on the modernmuzzleloader site they have sticky's for simple things like that...and of course if you search the forum there it is bound to pop up....
 

ENCORE

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Joined
Apr 6, 2011
Messages
1,130
Location
Near a lake with no fish
I am not a mzldr expert...but I believe the shim for the CVA is an o-ring placed in front of the primer....
If you look on the modernmuzzleloader site they have sticky's for simple things like that...and of course if you search the forum there it is bound to pop up....
Actually, the guys on M-M were the ones that started the "O" ring. If you check with some of those guys, they'll tell you also how to shim.
 

26Reload

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Dec 25, 2016
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2,613
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SE Idaho
I have two knight Ultralites....both shimmed with metal shims...
I know a lot of the guys talk about the orings for cvas...dont recall if any used the metal shims in cvas....
 
Last edited:

pooldoc

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Sep 3, 2012
Messages
56
Location
Opelousas,LA
I experienced similar problems with my Knight Disc Extremes when I installed their bare primer breech plugs and used heavy loads of BH209. At the time I was using CCI 209M primers. Switching to the regular Winchester 209 Primers (not the ones made for Muzzleloaders) helped but did not eliminate the problem. I used the info from the Modern Muzzleloader blog and ordered the stainless steel shims and installed them as directed. That has solved the problem. My total cost was about $25. There are several very competent folks that can do the job for you as well. The shims are installed in the primer pocket on the Knights. Not familiar with other makes.
 

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