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help with 300 mag

 
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  #8  
Old 12-16-2008, 06:58 PM
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Join Date: Dec 2001
Location: Winterville, NC
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Re: help with 300 mag

popwarlick,
Is this a sporter weight barrel and are you letting it cool in between shots? Also, did you work up this load in your rifle or just pick it from the manual? What kind of groups are you expecting? Four inch groups @ 400yds would be MOA, anything less would be gravy. That factory OAL probably isn't helping much. I haven't shot the AccuBonds out of my .300WM yet, but I do shoot the Ballistic Tips and I run them .010" off the LaG's. The AB and NBT's have the same tangent ogive. JohnnyK.
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  #9  
Old 12-17-2008, 08:29 PM
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Join Date: Oct 2007
Location: Flat Rock, Michigan, USA
Posts: 122
Re: help with 300 mag

I have a 300 WM Sendero SF, about 10 years old. The factory rifles seem to come with SAMMI maximum chambers, with generous neck diameter, and long freebore. I find for mine to be accurate, I must fireform brass, then partial neck size only, and then seat rather long, but not fully as long as the magazine. I use a max charge of IMR 4350 behind a Nosler 165g or 180g BT with a cartridge overall length of 3.525", which is 0.020" off the lands. Mine groups 1/2" at 100. The magazine can take a cartridge of 3.600", which if you seat this long, you might be well into the lands, which could create excessive pressure. I think the biggest key for the factory barrel, is partial neck sizing, which helps to align the bullet with the bore, which helps to increase accuracy, and then of course, finding the right load.

The 300 WM can be quite versatile. I also load 110g Speer spire points, at 1800-2200 fps for small game and close varmints, and 3600 fps as fast movers. These loads, even tho' having a big jump to the rifling, are quite accurate.

hope this has been helpful,
longshooter
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  #10  
Old 12-18-2008, 09:41 PM
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Join Date: Jan 2008
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Re: help with 300 mag

Thanks for the info,goingto get out there this weekend and trywhat yall said TERRY
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  #11  
Old 12-18-2008, 09:51 PM
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Location: The rifle range, or archery range or behind the computer in Alaska
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Re: help with 300 mag

While there are things you can do to help your accuracy using the components you have, you also need to keep in mind that a given rifle may or may not respond well to the components you put in it. To find her real potential, you may need to try different powders and bullets. Try the 180 AB's with another powder or 2 even. Then try the 200 AB's with the same 2 or 3 powders ect......H1000 is a tough one to beat. Also RL19 shouldnt be overlooked, especially with the 180's in a win mag.

Also have you checked the runout on your cases? (crooked necks)
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #12  
Old 12-18-2008, 10:50 PM
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Join Date: Jan 2008
Posts: 15
Re: help with 300 mag

I havent checked the runout.Thats 1 tool i aint got.What load do u shoot with the 1000.Iv e never turned the necks,checked the runout but i guess i need to start.How much does that affect accuracy.I talked with Sierra tech. and he said he shot a 190gr. matchking,even for hunting.Itsure has a better bc.What do yall think. TERRY
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  #13  
Old 12-18-2008, 11:23 PM
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Location: The rifle range, or archery range or behind the computer in Alaska
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Re: help with 300 mag

I have used the 190 SMK for hunting quite a bit and was more than satisfied with the inflight ballistics and always less than satisfied with it on game. I stopped using it for hunting altogether for big game.

Run out can cause a fair amount of trouble. how much it affects accuracy depends on how much RO there is. It doesnt work as good as a guage but if you roll them on a flat smooth surface you can see it with the naked eye if there is alot of it.

What kind of 400 yard accuracy are you getting?
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #14  
Old 12-18-2008, 11:35 PM
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Posts: 15
Re: help with 300 mag

Im shooting about a 5in. group
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