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Accuracy discovery.

This is a discussion on Accuracy discovery. within the Accuracy forums, part of the M14 M1A Forum category; Reloading for the M1A and the M1 Garand both rifles shot off the bench to a higher degree of accuracy using a neck bushing of ...


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Old January 3rd, 2017, 07:09 AM   #1
Lifer
 
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Accuracy discovery.

Reloading for the M1A and the M1 Garand both rifles shot off the bench to a higher degree of accuracy using a neck bushing of .337" dia., no neck expansion was necessary, these ar not "Slip Fits".. The neck bushiing of .333' along with neck expansion was my first choice until Banbam suggested the larger one,, nice to have him around...

The improvment in both rifles is rewarding, if you try this let us know how it works out for you... Art

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Old January 3rd, 2017, 07:47 AM   #2
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Using a bushing die without a neck expander is fine when the thickness of the brass is consistent. The bushing makes the neck OD round, and consistent brass thickness keeps the neck ID also round.

If the brass varies in thickness (easily visible after trimming), then the expander is needed to make the neck ID round - and a round ID makes it easier to seat the bullet.

Jay Kosta
Endwell NY USA

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Old January 3rd, 2017, 07:53 AM   #3
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Thanks for sharing. Assuming .015" neck thickness there is about .001" interference. Are you have any issues with bullet seating depth changing during the auto-load cycle?

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Old January 3rd, 2017, 08:34 AM   #4
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"Are you have any issues with bullet seating depth changing during the auto-load cycle?"

I don't about everyone else, but when you are shooting for top accuracy, you should load one round at a time.

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Old January 3rd, 2017, 09:01 AM   #5
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question for ArtL

. . who said:
Quote:
The neck bushiing of .333' (SIC) along with neck expansion was my first choice . . .

Art, you are leaving us in suspense! What is the diameter of your expander ball? How thick are your necks? Turned? Reamed? "I gots to know!"

btw, I am making a gizmo to hold a case aligned in my lathe so I can use a chucking reamer in a floating reamer holder.

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Old January 3rd, 2017, 11:20 AM   #6
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I'm also interested in the ID of the sized necks since case thickness is going to be a factor.

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Old January 3rd, 2017, 12:36 PM   #7
Lifer
 
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Expander dia..

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Originally Posted by shooter86314 View Post
. . who said:


Art, you are leaving us in suspense! What is the diameter of your expander ball? How thick are your necks? Turned? Reamed? "I gots to know!"

btw, I am making a gizmo to hold a case aligned in my lathe so I can use a chucking reamer in a floating reamer holder.
I don't know the dia. of the expander, it is a Lyman M2 expander', no turing no reaming, I do set a close COAL seating the 168 SMK's. All rounds are single loaded using a 2/3's closed rod drop.. I am very careful on controling this drop distance, making as certain as possible the opt rod seats consistant in the cylinder, that's IMPORTANT in an M1...

Using the .337" neck bushing only, don't know the neck OD.. I can measure a few if you like.. Using Fed, cases mostly, some NM M70 and Win.. All of them shot better, the Fed the best, followed closely by the MN M70..

As an example,,, in a rack grade M1, 10 shots,, without a scope,, at 100 averaged just over five inches, these cases were sized and used the .333" NB, followed by expanding, changing to the .333" with no expanding the 10 shot group was .320".. This happened several times using the Fed and PPU cases, not the same numbers but all much tighter..

If you would like the load let me know, don't shoot the M1 much and have not tried this in the M1A...

Show us the gizzmo, have a bench full of them.. Art

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Old January 3rd, 2017, 12:42 PM   #8
Lifer
 
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thank you.

Quote:
Originally Posted by Dave P View Post
"Are you have any issues with bullet seating depth changing during the auto-load cycle?"

I don't about everyone else, but when you are shooting for top accuracy, you should load one round at a time.

Single loading can be dangerous in worn receivers, many of these older M1 receivers can have safety bridge advancement, beward, use a "Sled" if in doubt.. Art

Thanks from Bamban
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Old January 3rd, 2017, 12:47 PM   #9
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Error. correction

Not PPU, but NM M70 cases... Art

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Old January 3rd, 2017, 01:03 PM   #10
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Do you mean the ten shot group was 3.20 inches here or .320 smaller or what? A little confused.. Thanks.

Quote:
Originally Posted by art luppino View Post
I don't know the dia. of the expander, it is a Lyman M2 expander', no turing no reaming, I do set a close COAL seating the 168 SMK's. All rounds are single loaded using a 2/3's closed rod drop.. I am very careful on controling this drop distance, making as certain as possible the opt rod seats consistant in the cylinder, that's IMPORTANT in an M1...

Using the .337" neck bushing only, don't know the neck OD.. I can measure a few if you like.. Using Fed, cases mostly, some NM M70 and Win.. All of them shot better, the Fed the best, followed closely by the MN M70..

As an example,,, in a rack grade M1, 10 shots,, without a scope,, at 100 averaged just over five inches, these cases were sized and used the .333" NB, followed by expanding, changing to the .333" with no expanding the 10 shot group was .320".. This happened several times using the Fed and PPU cases, not the same numbers but all much tighter..

If you would like the load let me know, don't shoot the M1 much and have not tried this in the M1A...

Show us the gizzmo, have a bench full of them.. Art

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Old January 3rd, 2017, 01:38 PM   #11
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Quote:
Originally Posted by art luppino View Post
...
changing to the .333" with no expanding
...
---------------------
Did you mean the .337 bushing and no expanding ?

Jay kosta
Endwell NY USA

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Old January 3rd, 2017, 02:19 PM   #12
Lifer
 
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Answer.

Quote:
Originally Posted by JayKosta View Post
---------------------
Did you mean the .337 bushing and no expanding ?

Jay kosta
Endwell NY USA
.337" bushing,,, no expanding..

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Old January 3rd, 2017, 02:22 PM   #13
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10 shots

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Originally Posted by WaM14gunner View Post
Do you mean the ten shot group was 3.20 inches here or .320 smaller or what? A little confused.. Thanks.

The 10 shots measured 3.020", outside to inside... Art

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Old January 3rd, 2017, 06:56 PM   #14
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Not to rob Arts thread but I have a question: Loading for an M1A that is shot from the magazine, is a 'tighter' neck better to hold the bullet in alignment during the rifles load cycle?

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Old January 3rd, 2017, 07:42 PM   #15
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Quote:
Originally Posted by art luppino View Post
The 10 shots measured 3.020", outside to inside... Art
That makes a lot more sense. The .320" 10 shot group previously mentioned had me in disbelief. Still from 5" down to 3.02" is quite an improvement. I wonder if the wear a rack grade barrel typically has would magnify the benefit of this process?

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