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Accuracy Progression

This is a discussion on Accuracy Progression within the Accuracy forums, part of the M14 M1A Forum category; I bought my first M14 type rifle from a member a few weeks ago. My goal was get something I could shoot in service rifle ...


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Old December 12th, 2016, 08:35 PM   #1
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Accuracy Progression

I bought my first M14 type rifle from a member a few weeks ago. My goal was get something I could shoot in service rifle class for fun. The rifle I purchased has a 1:11 Wolfe SS medium weight barrel, rear lug, ferrule modification, and is fully glass bedded. I figured that I'd document the accuracy improvements (or not) as I added the most common NM modifications. My target is to get the rifle to shoot about .5MOA Mean Radius with about 1.5MOA max spread.

Testing started with iron sights and no modifications for a baseline result. While the final configuration will be NM sights, I decided to add glass for testing.

To date, the biggest improvements have been the addition of a scope and changing from M80 ball to a load of Hornady HPBT over 40.0 gr of IMR 4895.

The attached chart shows the progression so far.

https://drive.google.com/file/d/0B3v...ew?usp=sharing

Here is the starting target after the addition of a scope. I combined three 5 shot groups.
[IMG][/IMG]


Last edited by Allen Humphrey; December 13th, 2016 at 09:17 AM.
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Old December 12th, 2016, 08:40 PM   #2
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After adding the scope and the quality hand load, the next modification was a unitized gas cylinder.

After adding the cylinder, I tried 3 different pistons. While the LRB black nitride piston gave the best group, I feel that my 10 shot group isn't statistically significant. Never the less, I will continue with that piston. Results below:

https://drive.google.com/file/d/0B3v...ew?usp=sharing


Here is the group after the listed modifications to date:

[IMG][/IMG]

Thanks from Dougboffl and boomerpusher

Last edited by Allen Humphrey; December 13th, 2016 at 09:19 AM.
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Old December 13th, 2016, 07:16 AM   #3
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Good post, keep up the good work. This is the kind of information that helps all of us to perfect our rifles.

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Old December 13th, 2016, 06:57 PM   #4
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Nice report. I like your method...

At this point, you and the rifle are both shooting well enough that I would suggest you look at a different aiming point for the scope. Everyone has preferences, but I get the best precision using a scope when the aiming point gives a definite contrast with the crosshairs. I have never had good luck with orange aiming dots, not precise and for me they wash out the center of the crosshair.

I like to use a black diamond on white. You size the diamond for the power of the scope, so that when the crosshairs are centered there are four tiny little diamonds of white showing around the crosshairs. They are easy to see and it's easy to tell if they are all exactly the same.

It ends up looking like this:



These are pretty easy to make in Word, and you just make the diamond whatever size you need for the distance and scope magnification.

Or, I have some made up already, if you are interested PM me your email and I'll send you a few to get started.

Thanks from Dougboffl and JEFFJP_N_JJ
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Old December 13th, 2016, 07:13 PM   #5
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Allen, I like your report too.

What SW or tools are you using for editing the pictures for groups?

Yahoo

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Old December 13th, 2016, 07:52 PM   #6
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Man, I knew I should have pulled the trigger on that rifle! :)

Thanks for the info, this is very helpful to us newbies. I'm also curious about the software you are using...

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Old December 13th, 2016, 08:05 PM   #7
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Quote:
Originally Posted by 2336USMC View Post
Nice report. I like your method...

At this point, you and the rifle are both shooting well enough that I would suggest you look at a different aiming point for the scope. Everyone has preferences, but I get the best precision using a scope when the aiming point gives a definite contrast with the crosshairs. I have never had good luck with orange aiming dots, not precise and for me they wash out the center of the crosshair.

I like to use a black diamond on white. You size the diamond for the power of the scope, so that when the crosshairs are centered there are four tiny little diamonds of white showing around the crosshairs. They are easy to see and it's easy to tell if they are all exactly the same.

It ends up looking like this:



These are pretty easy to make in Word, and you just make the diamond whatever size you need for the distance and scope magnification.

Or, I have some made up already, if you are interested PM me your email and I'll send you a few to get started.

Good thoughts on the diamond shape. My orange dot is kind of similar in that it is small enough such that a little orange wedge peeks out from all quadrants of the cross hair. I admit it isn't perfect. I'll also admit that I'm not a very good scope shooter and that I'm having a tough time getting a comfortable position given the relatively high line of sight through the scope. However, in the interest of not changing any variables in the middle of the test, I'm going to stick with this method. At the end I'll try your suggestion.

My next modification will be the addition of a NM spring guide. I'm a little skeptical about this one to say the least as I really cant see how it improves accuracy. As such, I purchased a $29 version instead of a $46 one becase I can't imagine that it would be 60% better.


Last edited by Allen Humphrey; December 13th, 2016 at 08:19 PM.
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Old December 13th, 2016, 08:09 PM   #8
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Originally Posted by Yahoo View Post
Allen, I like your report too.

What SW or tools are you using for editing the pictures for groups?

Yahoo
Its called "On Target Calculator". There is a free version and a stupid cheap full verion. I used to do the Mean Radius calculation by hand, but that gets old pretty dang fast. Works great for my needs.

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Old December 13th, 2016, 08:10 PM   #9
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? Allen, I have a SM with a 10X SS MILRAD on it and find it hard to see the 20 Dot targets I am trying to shoot... Is your 16 power better or should I go to a 20 power one?

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Old December 13th, 2016, 08:36 PM   #10
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Originally Posted by JEFFJP_N_JJ View Post
? Allen, I have a SM with a 10X SS MILRAD on it and find it hard to see the 20 Dot targets I am trying to shoot... Is your 16 power better or should I go to a 20 power one?
Full disclosure. I know squat about scopes. When I say squat, I mean diddley squat. The 16x scope I'm using is a borrowed Millet that retails for something like $350. I'm testing at 100yds and 16x is PLENTY for the 7/8" dots. I'm not dialing up and down or changing power. I got the POI set to where I want it and don't intend to change anything. Your decision about what scope to pick probably depends on how you intend to use it. Wish I could give more advice.

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Old December 13th, 2016, 08:57 PM   #11
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Quote:
Originally Posted by Allen Humphrey View Post
Full disclosure. I know squat about scopes. When I say squat, I mean diddley squat. The 16x scope I'm using is a borrowed Millet that retails for something like $350. I'm testing at 100yds and 16x is PLENTY for the 7/8" dots. I'm not dialing up and down or changing power. I got the POI set to where I want it and don't intend to change anything. Your decision about what scope to pick probably depends on how you intend to use it. Wish I could give more advice.
Thanks. I know diddley squat about them as well and mine is a fixed 10X.
I am just shooting the 10/20 dot contests here on the forum under rifle competition... I feel my 10X is limiting me on the 1" dot targets...
Jeff
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Old December 14th, 2016, 12:18 AM   #12
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Quote:
Originally Posted by Allen Humphrey View Post
As such, I purchased a $29 version instead of a $46 one becase I can't imagine that it would be 60% better.
And that, sir, I nominate for quote of the week.

Thanks from Wasted ammo
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Old December 14th, 2016, 08:57 AM   #13
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Quote:
Originally Posted by Allen Humphrey View Post
Its called "On Target Calculator". There is a free version and a stupid cheap full verion.
For those who don't have On Target you can find it here: http://www.ontargetshooting.com/download.html

I'm using Windoze 7 and I've found the free version does all I need.

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Old December 14th, 2016, 09:04 AM   #14
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Art Luppino has a post here somewhere showing his target of choice - a black right-angle triangle. The scope cross hairs only need to touch the two points of the triangle to give you perfect alignment. So it also gives a white triangle adjacent to the center of the scope cross hairs.

Thanks from JEFFJP_N_JJ
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Old December 14th, 2016, 10:09 AM   #15
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I think this is the thread regarding the triangle target-
Triangle targets

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