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  #1  
Old 05-17-2017, 05:53 AM
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Have a Question about cast bullets


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Am working with an 8X57 MM Mauser with original military barrel
Shooting a cast bullet .325 dia 200 grain Made by BRP industries before he sold out.
First eight rounds at 100 yards are to point of aim
Using 28 grains of IMR4895 I am getting 1845 fps average.

Starting with round 9 fps jumps to 1980 and accuracy goes totally south.
Becomes 1 inch of berm at 100 yards.
Shooting partner thought lands and grooves carboned up.
Ran cleaning brush through bore and a couple of patches.
Totally black.
Finally cleaned up after 5 patches and accuracy returned for 4 rounds and then same as before.
There are no signs of leading in the barrel.

Need ideas or solutions ( other than stop shooting the 8 MM)

old beekeeper
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  #2  
Old 05-17-2017, 06:16 AM
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My first thought was leading. Are the bullets gas checked?
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  #3  
Old 05-17-2017, 06:17 AM
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Are these bullets conventionally lubed?
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  #4  
Old 05-17-2017, 06:47 AM
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Quote:
Originally Posted by old beekeeper View Post
Ran cleaning brush through bore and a couple of patches.
Totally black.
Finally cleaned up after 5 patches and accuracy returned for 4 rounds and then same as before.
There are no signs of leading in the barrel.r
I suspect that you are not getting all the lead out.
After that fifth patch that came out clean (+/-), do the brush again and followed with patches to see?
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  #5  
Old 05-18-2017, 05:00 PM
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I have found that every barrel seems to have its own personality with cast bullets and to find the right load at the right velocity is often an adventure. Most of my rifles with some notable exceptions seem to like velocities around 1800 fps with gas checked bullets. I am assuming you are using gas checked bullets. If you aren't gas checked your ought to drop that velocity way down to about 1300. I haven't had much luck with 4895 and cast lead personally. I would start working with Unique
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  #6  
Old 05-19-2017, 05:52 AM
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Sorry it has taken so long to reply. Seems life has a tendency to get in the way.
Bullets are gas checked with aluminum gas checks, lubed with Bens Red lube (it works on all other bullets).
Lead is 50 % wheel weight , 50% pure , water dropped and let set for 1 year( forgot I had them).
BHN on the bullets is 14 + read with a Lee lead tester.

Cleaned with a brass brush the barrel shows black patches (at least 5) and no lead ( not even tiny flakes)
Brush again and get the same, it never changes.
Barrel is coated with mobile 1 as Humpy suggested for storage and wiped dry before firing.

old beekeeper
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  #7  
Old 05-19-2017, 08:04 AM
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Now I remember.

https://www.shootersforum.com/gun-cl...e-barrels.html
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  #8  
Old 05-20-2017, 12:28 PM
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Well gosh Cheezywan,
I guess I got my forums mixed up.
Wow hope you did not throw up as you read my post.!!
Just to make sure I do not hurt your sensitivity again I will ask a moderator to remove my name from the membership so you do not have to see my handle again.

Maybe when you are 80+ years old you will not have as much trouble remembering as I sometimes do.

Good bye and best of luck to the forum.

old beekeeper
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  #9  
Old 05-20-2017, 12:45 PM
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Settle down, he was just trying to help.
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  #10  
Old 05-20-2017, 02:20 PM
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Quote:
Originally Posted by old beekeeper View Post
Well gosh Cheezywan,
I guess I got my forums mixed up.
Wow hope you did not throw up as you read my post.!!
Just to make sure I do not hurt your sensitivity again I will ask a moderator to remove my name from the membership so you do not have to see my handle again.

Maybe when you are 80+ years old you will not have as much trouble remembering as I sometimes do.

Good bye and best of luck to the forum.

old beekeeper
I'm sorry Beekeeper. I meant no harm. Please pardon me. Give this stuff a read (if you want to).
I've not tried it myself, but it fits the problem.

http://www.sharpshootr.com/wipe-out/

Good luck working this out.
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  #11  
Old 05-21-2017, 08:21 AM
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For what it's worth, I had some I worked up with 180gr cast bullet's, 30-06. The extreame spread was so wide I was surprise I hit the target. Funny thing is the load shot very well. ES about 80 fps+!
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