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7mm groups @ 200

 
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  #1  
Old 04-06-2012, 04:12 AM
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Join Date: Apr 2012
Location: Aus
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7mm groups @ 200

Hi I'm new too this forum and it's m first post.
Ive just worked up load for my7mm rm which consistently shoots .5 moa groups @ 100 yds but when I take it to 200'it opens up to 2".. Has anyone experienced this as I was expecting '1" at least.. Am I asking for to much.
My load is 140ttsx 67g of re19 fed 215m primers in Norma brass'... They are cronyed at 3120...
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  #2  
Old 04-06-2012, 08:09 AM
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Re: 7mm groups @ 200

Some times it just does not work out like it should. You are not asking to much. I do load development at 400 yards for just that reason. I would shoot farther out, make a note of your current load and then go back to the drawing board and retune it at 2-400 yards, then check it at max range before settling on a load. I have a dragunov that does 1.5"@100...... 3"@200.....4"@500......and 12" @ 1000.......... can't explain it.....sometimes you just have to shoot em to figure out what they will do.
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  #3  
Old 04-06-2012, 08:16 AM
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Re: 7mm groups @ 200

Just a thought but have you cleaned lately with a good copper cleaner like BoreTech Eliminator? The coid copper bullets do foulw a bore faster and that will show up more at distance.

Jeff
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  #4  
Old 04-06-2012, 09:14 AM
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Join Date: Apr 2012
Location: Aus
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Re: 7mm groups @ 200

Barrel is clean...I just thought a group .5 or better @ 100 will shoot at 200+.... I've played with the charge up and down half a grain not much change... Il try another powder maybe or different projectile...
Thanks for replys
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  #5  
Old 04-06-2012, 01:06 PM
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Re: 7mm groups @ 200

check scope parallax. If the parallax is set properly for 100 and you shoot there, then go to 200 without correcting parallax, there will be some aiming error introduced that can open the group.

Take care,
-Bryan
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  #6  
Old 04-06-2012, 03:28 PM
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Re: 7mm groups @ 200

whats the BC on those Barnes even w/ a little wind it could be blowing them bullets around. Try a High BC bullet to see what you get. I just looked it up and it's only .412, Try a higher BC bullet if you don't use flags for load development.
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  #7  
Old 04-06-2012, 07:51 PM
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Join Date: Apr 2012
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Re: 7mm groups @ 200

I've read other forums and Emailed barnes they tell me the 140ttsx are good out to 500yds..... I'm only looking at taking shot out to say 350yds...the scope is a Z6 2-12-50 Swarovski with no parralax adjustment....
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