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Muzzleloader Hunting Techniques For Muzzleloader Hunting


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vertical stringing

 
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  #1  
Old 01-09-2013, 08:52 PM
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Join Date: May 2009
Location: roanoke,va.
Posts: 208
vertical stringing

I got to shoot my Bergara barreled Encore today. Very disappointing! Nothing but vertical stringing; and I mean three inches or more! I know the scope in on tight and it's a fine Zeiss. I'm shooting 110 gr. by vol. of BH209 and a Boat tailed 250 gr. Barnes with a blue sabot. Win 209 primers. Not the Win 7 primers. Tried another bullet and sabot , no change. I also shot 100 gr. BH209 with the Barnes and got a little better. Do you think I'm just not at the sweet spot in the charge? Oh, and no horizontal dispersion at all. I don't shoot this bad and neither should the Encore. It has a wonderful trigger and hing pin. It's tight. Any one suffer this before? What's up ?
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Old 01-10-2013, 01:37 AM
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Join Date: Aug 2010
Location: Boncarbo,Colorado
Posts: 99
Re: vertical stringing

could be barrel heat, i get that when i dont let the barrel cool down.

Does the hinge pin fit tight in the barrel lug itself? Remove the barrel and run it through the frame first, and then try the barrel lug. I had one that fit the frame real good but going through the barrel it was loose.
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Old 01-10-2013, 11:25 AM
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Join Date: Apr 2011
Location: NE Michigan
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Re: vertical stringing

Quote:
Originally Posted by FrontierGander View Post
could be barrel heat, i get that when i dont let the barrel cool down.

Does the hinge pin fit tight in the barrel lug itself? Remove the barrel and run it through the frame first, and then try the barrel lug. I had one that fit the frame real good but going through the barrel it was loose.
Very good advice.

If the fit in the barrel is to loose, it can be a contributing factor. If it is, then I would suggest you visit Mike's site and purchase the proper reamer. Mike Bellm TCs - Tools, Hinge Pin Reamers, Misc

You would be VERY wise to purchase the HD locking bolt spring from Mike also.

Check the mount carefully again. Make sure its tight and loc-tited down with BLUE. There's also the remote possibility of springboarding.
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  #4  
Old 01-10-2013, 11:34 AM
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Join Date: May 2009
Location: roanoke,va.
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Re: vertical stringing

Encore, what's springboarding? And what is the HD locking bolt spring? I will double check the pin; but it shot great with the 20 TAC so I doubt that's it. I am positive the mount and scope are good. And yes, blue was used on the mount. All good advise from both of you!Thanks
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Old 01-10-2013, 11:36 AM
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Join Date: May 2009
Location: roanoke,va.
Posts: 208
Re: vertical stringing

I just realized the new barrel doesn't have the same hole for the pin. Duh. I will check it. ( Hate getting old!)
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Old 01-10-2013, 01:37 PM
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Join Date: Apr 2011
Location: NE Michigan
Posts: 281
Re: vertical stringing

Quote:
Originally Posted by woodnut View Post
I just realized the new barrel doesn't have the same hole for the pin. Duh. I will check it. ( Hate getting old!)
Getting old just gives you more experience and our minds are working so fast, that sometimes we can't keep up with it. That's my reasoning behind it and I'm sticking to it.

Thank God you don't have the FLU......... that both the wife and I picked up. After having the shot back in October!!
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  #7  
Old 01-10-2013, 02:19 PM
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Join Date: Apr 2011
Location: NE Michigan
Posts: 281
Re: vertical stringing

Quote:
Originally Posted by woodnut View Post
Encore, what's springboarding? And what is the HD locking bolt spring? I will double check the pin; but it shot great with the 20 TAC so I doubt that's it. I am positive the mount and scope are good. And yes, blue was used on the mount. All good advise from both of you!Thanks
Bear with me here.... its hard to concentrate, let alone type. But, in my moments of clarity with this flu, this does give me something to do other than moan and groan. Thank God, as I appear to have started to get over the hump.

Springboarding..... is a term that is used when a shooter's scope and mount moves at the precise moment of ignition and prior to the bullet leaving the barrel. This is most noticeable with long range centerfire shooters. With both the Encore platform rifles and the CVA Apex, this can be a problem. Its caused by the mount over lapping the taper on the barrel. Any minute amount of space between the front mount and the barrel...... MAY.... notice I said .. MAY.. be the cause or a contributing factor. Again, this has been most noticeable with centerfire shooters. Now.. as crazy as this may sound, this is what the professionals are discussing.

I had considerable conversation with Kurt Bellm about this concern, in which he informed me that to his knowledge, I was the first to bring this to their (Bellm) attention when shooting a muzzleloader. Again, this is something that the centerfire shooter's complain of. There are a couple things that can be done to correct it, if, it is actual springboarding of the scope. Some have added another ring to their mounts. Others send in their barrels and have additional mounting screws drilled and tapped.

Kurt also explained another concern that .... MAY.... cause vertical stringing. It has to do with a slight excess in the frame for the locking bolt. I'm to darn tired to remember exact wording but, when the locking bolt locks when the rifle is closed, it there's an excess amount of space, it can also create vertical strings by the slightest of movement. NOTICE........... this can be present in ANY break open rifle. Bellm has welded and re-ground these for a tighter fit.

I spent hours on the phone with Kurt and Barnes Bullets ballistics experts over this issue. I actually got a math professor involved, who proved that the locking bolt could definitely be the cause. I experienced the issue and couldn't figure it out. I was shooting 200yds and right to left, wasn't varying 1/2" but, I was getting 2" to 2.5" vertical strings and it was driving me completely nuts.

The locking bolt spring is located on your barrel above the hinge pin. The factory spring is somewhat light, which is why Bellm sells the HD spring. Its a bugger to do by yourself. You want that pin inside a towel when you tap out the pin holding it. If not......... you'll be looking for both and you certainly don't want anyone hurt. Its just as hard or harder to install the HD spring. There's two ways, one someone drives the pin into place while you're trying to hold it in or..... you can use a very small "C" clamp which works very well. Wear eye protection.
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