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Long Distance Shooting Discuss tools, techniques, tips and theories of long distance shooting

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  #1  
Old 05-08-2018, 9:45 AM
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Default Group size measured, f class advice please

I found a photo of a group i took with my new 700 5r, .308, 24 inch braked barrel, timney 510, Bushnell HDMR 2, Grayboe Ridgeback, Harris bipod.

Anyway, i sighted it in with fed gmm, 175s, and shot this group as the fourth through ninth shots through the tube.

I measured the group on the photo by expanding the photo until the one inch target dot filled my calipers set to one inch, then measured the group, then subtracted .30, and got .52”.

Then i used an app and basically electronically did the same thing, telling the app the target dot is 1”, and i got .50” with that method.

Im comfortable that its under .75 moa, and close to or at .5 Moa.

Im VERY happy with this rifle.

Other than trigger time, and working up handloads, which i am doing, am i good in terms of equipment capability?

I considered a dofferent bipod, but its more a rifle i use in f class than an f class rifle.
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  #2  
Old 05-08-2018, 9:51 AM
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Here is the group I shot, 5 shots, factory ammo.
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File Type: jpg 20180324_115116.jpg (67.5 KB, 97 views)
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Old 05-08-2018, 9:58 AM
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Clarification, i am absolutely stoked about this group. I admit that, but i fully recognize there are many here who are far better than i, thats why i post here, to learn, but its a sincere question.

Only slightly bragging.
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Old 05-08-2018, 10:06 AM
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1/2 minute groups from a factory barrel is about the best it can get. If you can put down .5-.75 MOA on average, go out and shoot in the wind and get practice with that. Then when your ready spend the money on a new barrel.
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Old 05-08-2018, 10:26 AM
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Other than trigger time, and working up handloads, which i am doing, am i good in terms of equipment capability?.
I think a level would help if you’re gonna shoot a 308 in 1000y F-class matches.

Cheers,
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Old 05-08-2018, 10:43 AM
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I think a level would help if you’re gonna shoot a 308 in 1000y F-class matches.

Cheers,
Yes, i forgot, i have a uso rail level and one is built into the stock, but thank you. I need to make note of it as i shoot.
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Old 05-08-2018, 1:30 PM
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a five shot one hole group is as good as it gets with a factory barrel. Good job
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Old 05-08-2018, 6:42 PM
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In an F-class match you will be shooting three strings of 20 shots. I like to shoot minimum 10 to 20 shot strings in practice so that my read on how the rifle responds to the string becomes obvious enough to respond to any changes the rifle goes through over the string. Also, scoring will be out from center X and I notice in your picture that the group is low from the orange shoot and see, assuming that was you point of aim, you put a nice 5 shot group into the 8 ring.
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Old 05-08-2018, 8:58 PM
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Hmmm, never thought about putting the group outside the point of aim so it wouldn't mess up where to place the crosshairs?
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Old 05-08-2018, 9:44 PM
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Hmmm, never thought about putting the group outside the point of aim so it wouldn't mess up where to place the crosshairs?
Actually, neither did I until I fired that group. I had a magnetospeed Chrono on it and it dropped the poi about three inches. But, yeah.

What a great way to keep the aiming point, huh?
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Old 05-08-2018, 10:06 PM
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Actually, neither did I until I fired that group. I had a magnetospeed Chrono on it and it dropped the poi about three inches.
The weight of the magnetospeed effects the accuracy and the zero.
Do not do load testing or accuracy checking with the magnetospeed attached.
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Old 05-08-2018, 10:07 PM
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Hmmm, never thought about putting the group outside the point of aim so it wouldn't mess up where to place the crosshairs?
If your scope has an elevation knob, give it 3-4 clicks and then shoot your groups.
It keeps you from shooting out your aiming point.
When you are done, put those 3-4 clicks back so you are back on zero.

If you click in different directions for each group, you can use the same aiming point for about 8 groups before it starts to get confusing.
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Old 05-09-2018, 3:48 AM
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Originally Posted by Citadelgrad87 View Post
Actually, neither did I until I fired that group. I had a magnetospeed Chrono on it and it dropped the poi about three inches. But, yeah.

What a great way to keep the aiming point, huh?
well I must be the lucky one because i don't see movement in POI with the magneto speed attached. if my group is moving it's less than .5 moa and I can't attribute a POI shift to it alone. My poi shifts if I don't load the bipod correctly.

As for not testing for accuracy with it attached, while thats a good idea the Magneto speed as reported by many other top level shooters doesn't have the effect on accuracy on a heavy barrel. Many people here complain about POI shift but not accuracy. In any event i'm working on an Adapter to place the chrono where it will pick up the bullet but not be in contact with the barrel.

I wouldn't be able to do load work up without the chrono on the gun. I don't shoot ladders nor OCW
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The above statement i consider a term of endearment
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Old 05-09-2018, 3:50 AM
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BTW there are targets on the market and web that have an offset aiming point usually about 5 MOA to one side or the other and it's set up for maintaining a clean point of aim. Bench rest guys have been doing this for years.
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Dick.

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Originally Posted by tujungatoes View Post
That guy is a hack. He worked on one of my ak's and now the damn thing only shoots .50 cal bullets.
The above statement i consider a term of endearment
Need prints for your build? Need reference materials for Gunsmithing projects, Click Here
I fear that even though as tough as life has been for me I have only begun to pay for my sins.
Don't forget to have your Liberals spayed or neutered !

Last edited by kcstott; 05-10-2018 at 2:32 AM..
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Old 05-09-2018, 4:57 AM
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Quote from Mike Tyson: Thing about Cus was Cus would tell me what I'm doing wrong, everybody else just tells me I'm great.

Although the pictured group is a nice group for a factory rifle, one group demonstrates little, and the pictured group is certainly not a one hole group. OP is asking for F-class advice. Shoot longer strings so you can see how you and your rig are responding to multiple shots over time.
Build a solid position, work on the fundamentals of dealing with conditions, the mental aspect of the game, and practice, practice.
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Old 05-09-2018, 6:47 AM
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Shoot longer strings so you can see how you and your rig are responding to multiple shots over time.
I agree that a 20 shot string of fire will show the effects of variables that are not readily observed with a 5 shot group. Barrel heating, inconsistent position, concentration, shooter & eye fatigue, etc., play a huge factor in the three strings of 20 rounds fired.

Participating in any formal competition shows that shooter skill far outweighs the focus on quarter MOA rifles.
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Old 05-09-2018, 2:47 PM
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Originally Posted by ar15barrels View Post
The weight of the magnetospeed effects the accuracy and the zero.
Do not do load testing or accuracy checking with the magnetospeed attached.
I wasnt. I was just running the chrono to get data and thats the group i got.
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