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Posted: 9/5/2014 12:55:30 AM EDT
| I am trying to work up a good load for my socom but I am having a problem with accuracy. I have tried 165gn hornady sst and 168 gn hornady bthp with 2230-c, 4895 and varget powder. My problem is my first 3 shots shoot around a 1 inch group at 100 yds then my next 2 shots from the 5 shot group are 2 to 3 inches high and almost touching each other. Anybody have any idea why this is happening? I am stumped, any help would be greatly appreciated. |
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Some of the guys at www.m14forum.com have done a lot of testing on this.... ask your question over there also...
http://m14forum.com/rammac/ |
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You probably won't like the answer, but I think the rifle is essentially telling you it is a 3MOA shooter. I have the feeling if you start using 10 round groups, the size of the groups will become more consistent as will the average point of impact with respect to point of aim. i.e. You'll get the real picture of what is going on.
I used to have issues with "wandering groups", etc. When I started doing the above, my groups started to all look much more similar, and in my case, I realized the problem was me! |
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Quoted:
thanks for the replies, I will check out m14forums. popnfresh, it is shooting the same group layout over and over with the exception of one group that did string low to high, but the other 13 groups were as I described. Maybe something is moving. In this target here notice how each group is at the same point in relation to the extractor on the BFL, if I stack all 5 evenly it would make pretty much the same size group and I can assume that it will shoot about .65moa. Now if the groups clustered at different position around the BFL, and you stacked them it may make a 3moa group at which point I would have to assume that is my real group size. So if you stacked 10 of your 5 shot groups would there be a 30 shot 1moa groups over the poa and another 20 shot 1moa group 2inches from the poa? 
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Quoted:
Maybe something is moving. In this target here notice how each group is at the same point in relation to the extractor on the BFL, if I stack all 5 evenly it would make pretty much the same size group and I can assume that it will shoot about .65moa. Now if the groups clustered at different position around the BFL, and you stacked them it may make a 3moa group at which point I would have to assume that is my real group size. So if you stacked 10 of your 5 shot groups would there be a 30 shot 1moa groups over the poa and another 20 shot 1moa group 2inches from the poa? http://i3.photobucket.com/albums/y59/glock2027/CIMG1633_zpscb65a648.jpg Quoted:
Quoted:
thanks for the replies, I will check out m14forums. popnfresh, it is shooting the same group layout over and over with the exception of one group that did string low to high, but the other 13 groups were as I described. Maybe something is moving. In this target here notice how each group is at the same point in relation to the extractor on the BFL, if I stack all 5 evenly it would make pretty much the same size group and I can assume that it will shoot about .65moa. Now if the groups clustered at different position around the BFL, and you stacked them it may make a 3moa group at which point I would have to assume that is my real group size. So if you stacked 10 of your 5 shot groups would there be a 30 shot 1moa groups over the poa and another 20 shot 1moa group 2inches from the poa? http://i3.photobucket.com/albums/y59/glock2027/CIMG1633_zpscb65a648.jpg after looking at the targets if I stacked most of them on top of each other I would get a 1 1/2 to 2 inch group then 2 to 3 inches higher I get a second 3/4 to 1 inch group. |
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First
Make sure the gun is all tighten up? Are you using a scope or a red dot? Is the a cheap POS optic? Loose mounts can be suspect. Are you shooting off a solid bench? Next Use something known to be accurate Fed Gold Medal Match or BH Match ammo. Next Are you using the same lot of brass in doing your load work ups? Not using Mixed headstamps? |
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Quoted:
First Make sure the gun is all tighten up? Are you using a scope or a red dot? Is the a cheap POS optic? Loose mounts can be suspect. Are you shooting off a solid bench? Next Use something known to be accurate Fed Gold Medal Match or BH Match ammo. Next Are you using the same lot of brass in doing your load work ups? Not using Mixed headstamps? what do you mean by tighten up the gun? I am using a Nikon monarch 4-16 power scope in an arms 18 mount. Shooting is done from a sand bag on a stationary bench at 100 yards. I will buy a box of match ammo next time I get to the gunstore. I am newer to reloading so I dident sort my brass, I need to do that next. |
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Does that scope have adjustable parallax? If not, then you'll have to concentrate on getting your eye in exactly the same spot behind the ocular for every shot.
You're using a rest, but is the rifle in exactly the same spot on the rest for every shot? What happens to the rifle after each shot? It wanders aft on the rest unless it is pushed back to the same spot, and after the third shot it has moved enough to alter the point of impact. Are you using a rear bag, too? What about a rudimentary wind flag? Hang a piece of surveyor's tape from a stick about 25 yards out, watch the conditions, and the condition changes, and try to shoot in the same or similar conditions for each shot. Also pay attention to the air at the bench and down range. Use targets with a black or other dark aiming point against a light background. Ditch the orange targets, they're terrible for sighting a firearm. |
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Quoted:
Does that scope have adjustable parallax? If not, then you'll have to concentrate on getting your eye in exactly the same spot behind the ocular for every shot. You're using a rest, but is the rifle in exactly the same spot on the rest for every shot? What happens to the rifle after each shot? It wanders aft on the rest unless it is pushed back to the same spot, and after the third shot it has moved enough to alter the point of impact. Are you using a rear bag, too? What about a rudimentary wind flag? Hang a piece of surveyor's tape from a stick about 25 yards out, watch the conditions, and the condition changes, and try to shoot in the same or similar conditions for each shot. Also pay attention to the air at the bench and down range. Use targets with a black or other dark aiming point against a light background. Ditch the orange targets, they're terrible for sighting a firearm. To rule out the parallax setting of your scope, move your eye right to left or up and down in relation to the scope and see if the cross hairs move across the target. If the cross hairs don't move on the target it isn't the problem. If they do, try it again at a target at a different range until you find what the scope is set to. |
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