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Anyone own a 7mm 300 Win Mag?

 
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  #533  
Old 07-11-2014, 12:20 AM
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Re: Anyone own a 7mm 300 Win Mag?

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  #534  
Old 07-29-2014, 08:42 PM
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Re: Anyone own a 7mm 300 Win Mag?

Is anybody having any luck with the 168 Nosler Accubond Long Range in this cartridge? I've been trying a few and the results so far have been awful. 3 MOA at 200 yards at the worst and 1-1/2 MOA at its best. I've tried em at .010, .015, and .020 jump. I'm going to .100 jump next as I read a little on the Nosler forum about using that much jump. I'm using RP brass, WLRM primers, and H1000. This rifle will shoot 1/2 MOA at 500 with 162 AMAX's so I know it's not the rifle. Any ideas or recommendations are welcome. Thanks!
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  #535  
Old 07-29-2014, 09:35 PM
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Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by Ark. Trapper View Post
Is anybody having any luck with the 168 Nosler Accubond Long Range in this cartridge? I've been trying a few and the results so far have been awful. 3 MOA at 200 yards at the worst and 1-1/2 MOA at its best. I've tried em at .010, .015, and .020 jump. I'm going to .100 jump next as I read a little on the Nosler forum about using that much jump. I'm using RP brass, WLRM primers, and H1000. This rifle will shoot 1/2 MOA at 500 with 162 AMAX's so I know it's not the rifle. Any ideas or recommendations are welcome. Thanks!
Do you have a fairly heavy barrel contour? If not, you may have yet to find the accuracy node for this bullet. Light-to-medium contour barrels will favor a specific muzzle velocity range for a given bullet. I believe that's more likely to be the culprit than seating depth with groups that large in a proven rifle. The famous ladder method might be the perfect approach for you to find out. Only takes 5-10 shots at 300 yards.
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  #536  
Old 07-29-2014, 11:26 PM
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Re: Anyone own a 7mm 300 Win Mag?

Chuck it's a #5 Douglas and I think you may be right. It took a bit to get the AMAX's where I wanted em. The bolt lift is a bit heavy and the primers are somewhat flat but I finally hit the node with them at 82 grains of H1000. My chrony clocks em at 3440 with ~20 fps ES. I'll try a 500 yard ladder with the Accubonds. Thanks!!
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  #537  
Old 07-31-2014, 10:33 AM
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Re: Anyone own a 7mm 300 Win Mag?

ARK TRAPPER I have not yet tried the 168 ABLR bullets yet but I did try a few of the 175's in my 7-300 winny. My chamber is set up with .233" freebore .316" no turn neck this allows me to run the 180 berger's bearing surface-boat tail junction at the shoulder neck junction for optimum case capacity and it will still fit in standard mag box. I started them at the lands and pushed back .010" at a time they came into there own at around .070" off I do believe, I would have to check my notes to be absolute but it was right in there. I also noticed this with a few 300 RUM's with the 210's in that they really shot incredible loaded @3.660" COAL. They usually shoot some what ok at the lands but get way better the further off they are.
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  #538  
Old 07-31-2014, 11:19 AM
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Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by Elk Hunter 338 View Post
ARK TRAPPER I have not yet tried the 168 ABLR bullets yet but I did try a few of the 175's in my 7-300 winny. My chamber is set up with .233" freebore .316" no turn neck this allows me to run the 180 berger's bearing surface-boat tail junction at the shoulder neck junction for optimum case capacity and it will still fit in standard mag box. I started them at the lands and pushed back .010" at a time they came into there own at around .070" off I do believe, I would have to check my notes to be absolute but it was right in there. I also noticed this with a few 300 RUM's with the 210's in that they really shot incredible loaded @3.660" COAL. They usually shoot some what ok at the lands but get way better the further off they are.
Thanks Elk Hunter!! That's the info I was looking for. I've got an 8 round ladder test loaded up with the bullets setting at the lands to try and find a true max load and hopefully an accuracy node somewhere. If it gives me some viable info I'll start fiddling more with seating depth. I've got 200 of these things so if I can't get em to shoot by the time I've ran the first box out I'll sell the second box and just use another bullet.
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  #539  
Old 07-31-2014, 06:42 PM
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Re: Anyone own a 7mm 300 Win Mag?

Well here's the results of my 8 round ladder test with the 168 LRAB. The verticle spread on em wasn't bad, a little over 1 MOA for the ones in the node. The horizontal was really bad though, over 5 MOA. Even at 81 grains there wasn't significant flattening of the primer even though the bolt lift started to get heavy at 80.5 grains. The hole with the X was to check zero. [IMG][/IMG]
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