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200 yard groups . Need help

 
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  #8  
Old 11-26-2013, 06:34 PM
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Join Date: Feb 2012
Location: sparta, mi
Posts: 9
Re: 200 yard groups . Need help

Its a heavy contour. Just above magnum. My main concern was it should be 1/2 low at 200 yrds. But they were still 2 1/4 to 2 1/2 high at 200 yards. It was 32 out and we took our time 1 1 /2 hours for 12 shots. I think Brentm Hit the nail on the head. Shooter to scope alginment. Couldnt get comfy on bench. Ordered a rised cheek pad to try out. Will take another run at it. Thanks for all the help.
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  #9  
Old 11-26-2013, 07:27 PM
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Join Date: Jul 2011
Location: Near Napoleon,MI
Posts: 997
Re: 200 yard groups . Need help

Re-zero at 200, then I'm sure you will find that your POI is higher at 100. Thats the way it should always be done, validate the trajectory at the longest range you want to shoot, then dial it back down for shorter range. Due to wind, zero the windage at 100 only. Gravity is more consistent that a breeze...
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  #10  
Old 11-26-2013, 08:02 PM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,098
Re: 200 yard groups . Need help

270whiz,

You and/or your wife are doing well.

IF! all squares on all targets are 1" x 1" compare each 3 consecutive shots at 200 to the 6 shots shown at 100. Comparing 3 to 3 shows the rifle is doing it's part.

As with a race car, driver consistency is vital. You mentioned that you were not "comfortable" at the bench. Things won't improve until you get comfortable.

The 270 Win has been my life long friend. I'll bend over backwards to help a shooter that shoots that cartridge. It's a weakness bordering on addiction. :roll eyes:

This is a long range shooting site. I'll come at it from that viewpoint.

I recommend getting away from the bench. Not far away, just to the ground.

Do the bipod thing with a good solid rear bag. Your rig has plenty of weight, I'm thinking and recoil with your stated load shouldn't bother either you or your wife.

If you are shooting unexpectedly high @ 200 it maybe inconsistent or too little shoulder pressure is a problem. However, my 270 Win has always impacted higher at 200 when zeroed at 100.

I'm shooting 140 anythings @ 3200. I'm surprised you can get your stated velocity with 4831. I could never reach 3000 with that stuff.

I'm betting your rifle is good for 1/2 the group size shown, for 3 shots. With proper practice you and your wife will be also.

I"m impressed that you get that much accuracy from SSTs. They haven't performed for me.

Pay attention to cheek weld, shoulder pressure, bipod loading if shooting from one, and trigger break.

Keep posting targets. They tell a story.

Oh, don't waste too much barrel life messing with loads. Get one that you like then stretch the distance.

Good luck and good shootin'
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  #11  
Old 11-26-2013, 09:15 PM
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Join Date: Jul 2004
Location: OHIO
Posts: 2,419
Re: 200 yard groups . Need help

Is it not possible that the bullet is still "climbing" at 200 yards? I seem to remember shooting a 270 a few years ago (one of my many) and I was 2" high at 100 and 3" high at 200. Can't really remember if I chronographed that load or not but it turned out that I was launching a 130 NBT pretty darn fast. This was > 10 yrs ago but the barrel is 25.5" long. Just something to ponder.

Center your zero to 100 yards and see if you are still higher at 200. I think that's what I did and much to my surprise my bullets were hitting higher, which blew my previous thoughts out of the water where all of the info I thought I knew was that "2 inches high at 100 yards MEANS your are zeroed at 200 yards."
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  #12  
Old 11-26-2013, 09:18 PM
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Join Date: Jul 2004
Location: OHIO
Posts: 2,419
Re: 200 yard groups . Need help

Oh, and I'm absolutely a like-minded individual to Roy when it comes to the 270 Win. When I search the forums, I hone in every time I see anything to do with it. My all time favorite rifle caliber, and likely always will be. That said, I rather enjoyed using my 6.5-284 in KY and SC this year killing a nice old 8 pointer and big juicy doe with that rifle using the 130 AB.
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  #13  
Old 11-26-2013, 10:08 PM
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Join Date: Jul 2011
Location: Near Napoleon,MI
Posts: 997
Re: 200 yard groups . Need help

Looking online: Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 270 Win :: 270 Win 130 gr GMX® Superformance®
Muzzle 100 200 300 400 500
3190 2976 2769 2573 2385 2202
1.5 1.20 0.00 -5.80 -16.80 -33.90

So even the Hornady superformance load is following the laws of gravity...

Looking at your 100 yard target it looks like the zero is about an inch high. That means that the "true" zero point is out beyond 100 yards some way. The add some other unaccounted for effects like a difference in elevation between the 100 and 200 yard target, a different hold on the rifle for the 2 different ranges, moving the face forward or back relative to the scope because of the increased range, inability to see the same aiming point at the longer range ??

There are many things that could cause this outcome, but knowing where you are truly zeroed will require a bit more consistent shooter performance first.

I agree with shooting prone for longer range if at all possible. Your upper body is unsupported on the bench and less than 1.3 of your body mass is really reacting to the recoil. Whereas prone you have all your weight behind the rifle, front and rear can be properly supported and you can take your time getting comfortable for the shot. I know our local DNR range does not allow prone shooting which is why I now have permanently set up steel targets at the farm at 160 and 320 yards.
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  #14  
Old 11-27-2013, 08:58 AM
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Join Date: Feb 2012
Location: sparta, mi
Posts: 9
Re: 200 yard groups . Need help

Thank you for all your help. This is a great place to get Good Solid Info !

Roy, We spend most of our time practicing on sticks and bi-pods to keep it real.


Wife shoots a 25-06 rem. Its in the shop for some

tweaking. But a custom 270 is in her future . [ So she says ] LOL. Derek and

Westcliffe, Thank you also. Be back at the range next week and get it worked out .
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