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Sighting Zero at what distance ???

 
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  #15  
Old 03-23-2010, 03:38 AM
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Re: Sighting Zero at what distance ???

I couldn't prove it one way or the other because I don't have the repetitive experiences, but I've read that velocity can reach a peak and barrels have a tendency to perfom optimally after ~50-60 rounds. Benchrest competition shooters would be the best source for answering this question. All I'm offering here is what I've read.
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  #16  
Old 03-23-2010, 06:36 PM
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Re: Sighting Zero at what distance ???

I would expect a custom barrel the bench guys are using to settle down quicker then a factory barrel. When I break a barrel in I let the barrel determine, even if you don't use a chrony at least you can tell when it doesn't collect as much copper fouling. The DPMS .308 I just bought has had about 20 rounds (cleaned after each) through it and fouls like crazy. I don't know how many rounds they put through it at the factory but it took several cleanings to remove all the copper. I am about ready to just go shoot the darn thing at the range and see how she does. She might like being dirty...real dirty. I usually don't clean my rifles till they tell me to anyways.
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  #17  
Old 03-23-2010, 10:38 PM
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Re: Sighting Zero at what distance ???

What are you planning on shooting at at a 1000 or more yards? Most high power, long range shooters I know recommend going to a 200 gr bullet for 1000 or 1000+ shooting, as it retains velocity better. I know one guy who's using 250gr bullets. These folks are hard butt shooters out to win. I was advised to use 190s in my 308 Winchester (not mag), since the lighter bullets tend to lose velocity too fast, and though a mag probably wouldn't , can go subsonic at a 1000 yds. Only have to get the 190s moving about 2550 to stay sonic at a 1000 yds (if a bullet goes subsonic, that is drops below speed of sound, it will often become unstable, start to yaw, and go off target altogether).

There is a standard rule of thumb for how far to come up with almost and ammo. It's called the 2,2, 3,3 4,4, etc rule. from 100 you need to come up 2 moa, to be on at a 200, 2 more to be on at 300, then 3 more to be on at 400, and so forth. for my 308, I need 39 minutes of elevation to be on at a 1,000 yds, and this is probably pretty close for most rounds, though might be a bit less for a Win Mag, but not really that much less. There are targets sold that allow you to sight in your rifle for a 1000 yds, at 50 yds (and fine tune it at a 1,000 yds). Also, using this target, which is actually made for using the 06/308, you could then "check" your dots to see where they are at. Set the main cross hair at say 500, then aim where your need to on the target, with the next dot and see where you're hitting. Might find that using you main poa as 500 then the next dot would give you 600. But if not, once you've determined how far you have to come up at each yardage, put it on a piece of tape and glue it to your rifle for reference.

I think Sierra has a routine on their web site about breaking in a barrel. Some barrels are lapped to begin with , so might not foul from day one, while others, might be rough and foul for 50 shots or more. Basically, the routine is, fire a shot, thoroughly clean the barrel, fire another one, throughly clean the barrel, fire another, and so on, for 5-6 rounds, then fire 2 for another half dozen firings. Best thing in the world right now for cleaning a barrel where fouling might be, is Wipe Out. Spray it in, let it set a few minutes and wipe it out. Will definitely take the copper out. Can be gotten from MidWay. I've quit using anything else.

If you've been shooting awhile and still getting fouling, go to Corbin swage companies web site and they have a product that you can put on a tight patch and it'll scrub stuff real aggressively, and another that will LAP the barrel. Might also want to look at Midway for the Dave Tubb fire lapping set up which has bullets enbedded with different amounts of grit. Fire the set through the barrel, in order, and should have all the roughness out.
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  #18  
Old 03-24-2010, 04:52 AM
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Re: Sighting Zero at what distance ???

Quote:
Originally Posted by tysue View Post
What are you planning on shooting at at a 1000 or more yards? Most high power, long range shooters I know recommend going to a 200 gr bullet for 1000 or 1000+ shooting, as it retains velocity better. I know one guy who's using 250gr bullets. These folks are hard butt shooters out to win. I was advised to use 190s in my 308 Winchester (not mag), since the lighter bullets tend to lose velocity too fast, and though a mag probably wouldn't , can go subsonic at a 1000 yds. Only have to get the 190s moving about 2550 to stay sonic at a 1000 yds (if a bullet goes subsonic, that is drops below speed of sound, it will often become unstable, start to yaw, and go off target altogether).

There is a standard rule of thumb for how far to come up with almost and ammo. It's called the 2,2, 3,3 4,4, etc rule. from 100 you need to come up 2 moa, to be on at a 200, 2 more to be on at 300, then 3 more to be on at 400, and so forth. for my 308, I need 39 minutes of elevation to be on at a 1,000 yds, and this is probably pretty close for most rounds, though might be a bit less for a Win Mag, but not really that much less. There are targets sold that allow you to sight in your rifle for a 1000 yds, at 50 yds (and fine tune it at a 1,000 yds). Also, using this target, which is actually made for using the 06/308, you could then "check" your dots to see where they are at. Set the main cross hair at say 500, then aim where your need to on the target, with the next dot and see where you're hitting. Might find that using you main poa as 500 then the next dot would give you 600. But if not, once you've determined how far you have to come up at each yardage, put it on a piece of tape and glue it to your rifle for reference.

I think Sierra has a routine on their web site about breaking in a barrel. Some barrels are lapped to begin with , so might not foul from day one, while others, might be rough and foul for 50 shots or more. Basically, the routine is, fire a shot, thoroughly clean the barrel, fire another one, throughly clean the barrel, fire another, and so on, for 5-6 rounds, then fire 2 for another half dozen firings. Best thing in the world right now for cleaning a barrel where fouling might be, is Wipe Out. Spray it in, let it set a few minutes and wipe it out. Will definitely take the copper out. Can be gotten from MidWay. I've quit using anything else.

If you've been shooting awhile and still getting fouling, go to Corbin swage companies web site and they have a product that you can put on a tight patch and it'll scrub stuff real aggressively, and another that will LAP the barrel. Might also want to look at Midway for the Dave Tubb fire lapping set up which has bullets enbedded with different amounts of grit. Fire the set through the barrel, in order, and should have all the roughness out.
Great Quote Tysue...thanx heaps i will take it all on board.....
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  #19  
Old 03-24-2010, 06:06 AM
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Join Date: Oct 2006
Location: Maryland, near Balmer
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Re: Sighting Zero at what distance ???

I just thought of something. When we're shooting, we use iron sights, so the 2,2 3,3 thing might be a bit off, as we're aiming 6" high when using a 6 o'clock hold, at 200 yds (we never shoot at a 100 except practicing at short range where we don't have a longer range to use). But try it. Sight in dead on at 100, then shoot at 200 and if 4" low, you'll know you have to come up 2" at the 100 yds mark to be on at 200. Then shoot at 300, and if 6" low there, will know you need another 2" up at a 100, and if that works, then the 2,2 3,3 thing is going to work pretty close.

If you look at the National Target Company webb site, I think they carry the sighting in target I was telling you about. You aim at the bottom aiming point and adjust the impact to the correct height for the distance you want to shoot to. My 308 is sighted in 39" high at a 100 yds, to be on at a 1,000.

There's another site about long range Match shooting, and the guy who runs it is a nationally known long range shooter, and he might be able to give you some closer coordinates for your WM.

I'll see if I can locate the site name and get back with you.

Okay, try longrangerifleteams.com, that should work. The folks who run this forum are long range, highpower, shooters.

Last edited by tysue; 03-24-2010 at 06:13 AM. Reason: add additional information
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  #20  
Old 03-24-2010, 06:10 AM
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Join Date: Oct 2006
Location: Maryland, near Balmer
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Re: Sighting Zero at what distance ???

Try longrangerifleteams.com, that should work. These guys all highpower long range shooters, or most are, and the guy who runs the site is.
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  #21  
Old 03-24-2010, 06:26 AM
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Join Date: Jan 2010
Location: Johnstown, Pa
Posts: 3
Re: Sighting Zero at what distance ???

I always zero my rifles at 100 yards. Than use my Target knobs or Mil dots from there. Keeps it simple.

Hope it helps,
JamieD
Wolf Precision
All Hogs Go to Heaven
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