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 bp loaded cartridges

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56 kodiak shooter

Number of posts : 31
Age : 60
Location : biglerville, pa.
Registration date : 2015-12-29

PostSubject: bp loaded cartridges   July 13th 2017, 10:23 am

I have a gonic arms ga 93 stainless, I'm shooting 90 grs. of 2F swiss black powder with a 460 no excuse conical, on the target the holes appeared to be oblong, what to do to solve this thanks for any advice- randy
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Number of posts : 369
Age : 64
Location : Delaware
Registration date : 2011-11-27

PostSubject: Re: bp loaded cartridges   July 16th 2017, 10:15 am

If they are oblong that  usually means the bullet is keyholing in other words not being stabilized by the rifling twist.  There are usually 2 causes for this one is that the bullet is to long for the twist rate, or that the bullet is not sealing the bore tightly and gas blow by is upsetting the bullet upon exiting  the barrel.

For number one check the length of the bullet vs the twist rate in your barrel.  For number two check your bullet diameter.  You may have to use a wad or a mmp sub base to help you stop the blow by .

Good luck !
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Number of posts : 144
Age : 71
Location : Ohio
Registration date : 2017-07-17

PostSubject: Re: bp loaded cartridges   July 22nd 2017, 11:16 pm

I can't find any information on the web about the twist rate.
Twist rate would be an important piece of information to have.
Long bullets need a faster rate of twist vs. round balls.
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Number of posts : 5862
Age : 75
Location : central Florida
Registration date : 2012-08-22

PostSubject: Re: bp loaded cartridges   July 23rd 2017, 9:49 am

You can measure the twist rate yourself with a ramrod/cleaning rod and a tight patch.


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