Ever had a gun that takes more than one fouling shot to get it to group right? Cleaned a gun until no copper was in the bore. Took it out and shot a 5 shot group. First and second shot were an inch vertically apart. 3rd through 5th were pretty much a ragged hole but about an inch left of the 2nd shot. Never had a gun like that before. It's a buddies of mine and he has probably never cleaned but a few times since he has had it.
Fouling shots
- Thread starter Korhil78
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Broz
Well-Known Member
Sounds like a chromemoly barrel and the type of cleaning process to me. Some moly tubes do need to settle back in for a number of reasons. But I have found big differences in cleaning solutions for this problem. Try Boretech Elimiator, do not use oil in the barrel and finish with 5 dry patches before you shoot. My rifles are spot on with the first shots even at well past 1000 yards. But they are stainless tubes too.
Jeff
Jeff
Its just a factory Model 70 300 RUM blued barrel. Its also a sporter contour so it is a thin barrel which in my view is not good for a large magnum caliber such as the 300 RUM.
I also use Boretech but I use the CU+2 stuff that they came out with. This barrel copper fouls SUPER bad. I even let the Boretech sit in the barrel overnight and was still pulling copper off of the rifling this morning.
I have also found that all of my guns that I own are spot on with the first shot as well with Boretech. That is why I use it. But this is not my gun, and the only differences I can think of are:
1. I break in all of my barrels.
2. I clean them regularly.
I also use Boretech but I use the CU+2 stuff that they came out with. This barrel copper fouls SUPER bad. I even let the Boretech sit in the barrel overnight and was still pulling copper off of the rifling this morning.
I have also found that all of my guns that I own are spot on with the first shot as well with Boretech. That is why I use it. But this is not my gun, and the only differences I can think of are:
1. I break in all of my barrels.
2. I clean them regularly.
Broz
Well-Known Member
I would agree and add, it is probably time to seat the bullets out farther in the RUM to try to keep up with the erroding throat.
Jeff
I wish that I could seat them out further but he doesn't want a single shot. So, I am loading them out to mag length and just doing the best I can from there.
Broz
Well-Known Member
Yeah I have been there. Once the throat starts going out (and it dont take long) you add that with the freebore of the rum and you have a pretty large gap to jump.
Jeff
WildRose
Well-Known Member
Yep, sounds like a rough/poorly/improperly lapped bore.
Most of the factory rifles I've had over the years were similar which is why I just never bothered to clean them frequently and always followed up a cleaning with three fouling shots before sighting in.
Yup, that is pretty much what I told him. Told him to just fire 2 shots after cleaning it and put it in the safe.
WildRose
Well-Known Member
How many rounds does it have down the tube?
To be honest, i never asked him.
WildRose
Well-Known Member
Ask and let us know as that would make a difference.
I had one I was just having hell getting to shoot for me new, went through the regular break in, still not shooting well, so I devised my own way of doing a light lapping and afterwards it's shooting well under MOA.
Cleans like a dream now as well.
I seem to be having the opposite problem, i also have a new model 70 but mine is in .300 WM
I was working on developing a new load, magazine length COAL and IMR 7828 starting with 65 gr and moving up .5 every three shots, first 3 were sub MOA the next 3 were about MOA following 3 increased to about 2.5 MOA and my 10, 11, and 12th shots were in a 5 inch vertical line (was waiting a couple min between shots and longer between groups)
Then i took it and cleaned it pretty good and fired three more shots that had 67.5 gr powder, two almost touching and the other i pulled on a bit and was 1.5 in away.
Could this be from the barrel simply fouling up or could the powder difference really cause that much of a variation?
I was working on developing a new load, magazine length COAL and IMR 7828 starting with 65 gr and moving up .5 every three shots, first 3 were sub MOA the next 3 were about MOA following 3 increased to about 2.5 MOA and my 10, 11, and 12th shots were in a 5 inch vertical line (was waiting a couple min between shots and longer between groups)
Then i took it and cleaned it pretty good and fired three more shots that had 67.5 gr powder, two almost touching and the other i pulled on a bit and was 1.5 in away.
Could this be from the barrel simply fouling up or could the powder difference really cause that much of a variation?
Broz
Well-Known Member
It could be a lot of things, but first thing that comes to my mind is solid copper bullets. I have owned a few rifles that needed cleaned every 10 to 15 shots to maintain decent accuracy with solids due to the amount of copper they left in the tube. If you are shooting solids try another bullet. If you are not thenI think you have a really rough bore and need to do a good brake in process ar lapping of some sort. Another thing that could help is a better cleaner to get all the copper out. I recommend BoreTech Eliminator, I have tried it against most all of them and it does a better job.
Jeff
cummins cowboy
Well-Known Member
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- Nov 21, 2010
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most of my barrels need at least one fouling shot, only one I own that does not is my new 5r 243 barrel from krieger.
