Question about Lyman GPR ball/patch sizes
05-17-2010, 08:09 AM
#11
Nontypical Buck
Thread Starter
Join Date: Aug 2005
Location: Phoenix, AZ
Posts: 3,813
Thanks Chet!
I have been giving this some though, but did not want to post until I was able to test my theory. Well here goes anyway...
Maybe the powder is not dropping all the way to the bottom of the barrel. Then as I push ball and patch down, the powder granules are getting wedged in between the rifling and the ball/patch. Basically acting like a door jam, the wedged powder is what is causing the resistance. What I have also noticed is that the resistance while running the ball/patch down the barrel is not even. That is at some parts it is really tough and then it will be easy. Almost as if the barrel has widened, which I do not think is the case.
I haven't had a chance to test this theory, was planning on doing that later in the week and reporting back. After pouring the powder, I am going to run just a patch down first. The idea is to make sure all the powder gets pushed down first and then run the ball/patch to see if I encounter as much resistance.
Details to follow...
I have been giving this some though, but did not want to post until I was able to test my theory. Well here goes anyway...
Maybe the powder is not dropping all the way to the bottom of the barrel. Then as I push ball and patch down, the powder granules are getting wedged in between the rifling and the ball/patch. Basically acting like a door jam, the wedged powder is what is causing the resistance. What I have also noticed is that the resistance while running the ball/patch down the barrel is not even. That is at some parts it is really tough and then it will be easy. Almost as if the barrel has widened, which I do not think is the case.
I haven't had a chance to test this theory, was planning on doing that later in the week and reporting back. After pouring the powder, I am going to run just a patch down first. The idea is to make sure all the powder gets pushed down first and then run the ball/patch to see if I encounter as much resistance.
Details to follow...
05-17-2010, 01:46 PM
#13
Guest
Posts: n/a
Thanks Chet!
I have been giving this some though, but did not want to post until I was able to test my theory. Well here goes anyway...
Maybe the powder is not dropping all the way to the bottom of the barrel. Then as I push ball and patch down, the powder granules are getting wedged in between the rifling and the ball/patch. Basically acting like a door jam, the wedged powder is what is causing the resistance. What I have also noticed is that the resistance while running the ball/patch down the barrel is not even. That is at some parts it is really tough and then it will be easy. Almost as if the barrel has widened, which I do not think is the case.
I haven't had a chance to test this theory, was planning on doing that later in the week and reporting back. After pouring the powder, I am going to run just a patch down first. The idea is to make sure all the powder gets pushed down first and then run the ball/patch to see if I encounter as much resistance.
Details to follow...
I have been giving this some though, but did not want to post until I was able to test my theory. Well here goes anyway...
Maybe the powder is not dropping all the way to the bottom of the barrel. Then as I push ball and patch down, the powder granules are getting wedged in between the rifling and the ball/patch. Basically acting like a door jam, the wedged powder is what is causing the resistance. What I have also noticed is that the resistance while running the ball/patch down the barrel is not even. That is at some parts it is really tough and then it will be easy. Almost as if the barrel has widened, which I do not think is the case.
I haven't had a chance to test this theory, was planning on doing that later in the week and reporting back. After pouring the powder, I am going to run just a patch down first. The idea is to make sure all the powder gets pushed down first and then run the ball/patch to see if I encounter as much resistance.
Details to follow...
05-18-2010, 03:42 AM
#15
Fork Horn
Join Date: Feb 2009
Posts: 107
You can use a jag end to seat the ball. That is all that I have ever used. Never had a problem.
You might try - just to see - putting a thin cardboard/fiber wad down the barrel after the powder is in and before you seat the PRB.
Ditto the advice about thicker patches. I have the GPR as a .50 and 0.010 patches give fine accuracy out to 100 yards. I do have a .54 barrel but it is a smoothbore; PRBs in that get a tight patch but since there are no lands or groves to fill, the thickness is not what you'd expect, usually a 0.010" (again) and a .530 RB (though I am always working on it.)
Pete
You might try - just to see - putting a thin cardboard/fiber wad down the barrel after the powder is in and before you seat the PRB.
Ditto the advice about thicker patches. I have the GPR as a .50 and 0.010 patches give fine accuracy out to 100 yards. I do have a .54 barrel but it is a smoothbore; PRBs in that get a tight patch but since there are no lands or groves to fill, the thickness is not what you'd expect, usually a 0.010" (again) and a .530 RB (though I am always working on it.)
Pete
