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M1 accuracy

This is a discussion on M1 accuracy within the M1 Garand Accuracy forums, part of the Rifle Forum category; This was my best 8 shot group today. Shooting at 100yds. All of my handloads were 150 gr. fmj, IMR 4895 and the same length. ...


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Old February 19th, 2017, 05:25 PM   #1
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M1 accuracy



This was my best 8 shot group today. Shooting at 100yds. All of my handloads were 150 gr. fmj, IMR 4895 and the same length. This group had 45.5 gr of powder. 45 gr. was a close second (my lowest charge). The gun was cold when shot those. I went as high as 46.5 gr and those were terrible. The vertical stringing got worse with the increase of powder. POI changed by a couple inches as well. I shot one clip of LC surplus. That was better than 46+ gr of powder. Less vertical stringing and the most round group I had.

What causes vertical stringing? I'm not sure if it's me the gun or the ammo. I slung it tight with my hand resting on sand bags. The rifle is a SG with new stock. I did some accuracy fitting to the stock. Hooded aperture and SS trigger. The bullets are cheap second hand. I wouldn't expect them to cause stringing though. Let me know what you think.

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Old February 19th, 2017, 05:34 PM   #2
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That looks like a dead Axis soldier with every shot to me!

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Old February 19th, 2017, 05:47 PM   #3
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Nice shootin!

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Old February 19th, 2017, 05:52 PM   #4
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Talking Nice job !!!

The more you shoot the better it gets and the easier it becomes. Thats a nice first time out target to be sure.

Now get you an early 16" bayonet and do a bayo charge at 100 yards and post target / stick results................ and cardio report if required !




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Old February 19th, 2017, 05:58 PM   #5
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Vertical stringing usually reflects breathing control issues.

Group is very, very nice for 150 fmj.

John

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Old February 19th, 2017, 06:31 PM   #6
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Any chance that low left shot was the first one out of the enbloc?

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Old February 19th, 2017, 06:50 PM   #7
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I'm not unhappy with this group. If it weren't for that bottom hole I'd be real happy with it. I shot two clips of the 46.5's. The vertical stringing was double the size that you see here. As tall as the red of the target. Left to right was only a little worse. It's that bottom hole and comparing targets that leads me to believe vertical stringing is an issue that I need to address. I will be using this rifle for service rifle competition this year so I want it to be the best it can be without making it totally JCG illegal. (the trigger and sight are easily returned to stock). I'm pretty green. If it's me then I need to address that as well. The way the stringing changes with the ammo makes me think at least some of it is the rifle.

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Old February 19th, 2017, 06:53 PM   #8
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Any chance that low left shot was the first one out of the enbloc?
There's a chance. I don't know the order the holes were punched.

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Old February 19th, 2017, 07:37 PM   #9
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So us a picture of your rifle, good shooting that's what it was made to do!

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Old February 19th, 2017, 08:04 PM   #10
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So us a picture of your rifle, good shooting that's what it was made to do!
The weather should be good this week. I would like to get it out in the sun for some new pics.

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Old February 19th, 2017, 10:32 PM   #11
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I have found reloading extruded propellant can be problematic when a standard powder measure is used. I have seen variations of up to 0.6 grains when measuring extruded propellant with a standard powder measure. That translates to somewhat excessive vertical dispersion. Trickling or use of an automatic powder measure can help. Rick

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Old February 20th, 2017, 03:06 AM   #12
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Is there a gap between the front handguard and the gas cylinder? If not thats your culprit
Personally I dont think that gropu is that bad. The low rd could be the first shot which is normal to throw it. Take away to top round which could be just shooter error and you have a tight group

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Old February 20th, 2017, 10:18 AM   #13
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Originally Posted by rickgman View Post
I have found reloading extruded propellant can be problematic when a standard powder measure is used. I have seen variations of up to 0.6 grains when measuring extruded propellant with a standard powder measure. That translates to somewhat excessive vertical dispersion. Trickling or use of an automatic powder measure can help. Rick
I weighed almost all of the charges. My RCBS powder measure is new and had some paint chips coming through throwing it way off. The more I loaded the better it got.

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Old February 20th, 2017, 10:23 AM   #14
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Is there a gap between the front handguard and the gas cylinder? If not thats your culprit
Not sure about a gap without looking at it, but I'm sure the handguard is loose. The rear handguard needs some trimming for sure. It may be contacting the stock and receiver.

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Old February 20th, 2017, 04:43 PM   #15
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Do you snug it snug it up and shoot your eight shots?

Or do you take it off your shoulder, loosen up, snug it back up on your shoulder and take the next shot, for all 8 shots?

I'm just curious if the rifle butt is moving down your shoulder and changing your cheek weld some as the number of shots increase.

Shooting off a bench is different than shooting prone. Shooting prone the rifle is supported by both your arms and the effects of the sling (if done properly). Shooting off a bench the shooting hand/arm usually isn't bracing/supporting the rear of the rifle as well as it would in prone.

You said you had the front on sand bags. So it should be pretty well fixed in place, it's the back I'm wondering about.

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