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w 748 in m1a

This is a discussion on w 748 in m1a within the Ammunition forums, part of the M14 M1A Forum category; anybody loading w748 in 7.62x51 lc cases sierra 155 palma ? will be used in a m1a. thanks....


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Old February 18th, 2013, 06:01 AM   #1
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w 748 in m1a

anybody loading w748 in 7.62x51 lc cases sierra 155 palma ? will be used in a m1a. thanks.

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Old February 18th, 2013, 06:21 AM   #2
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Closest is 30-06 M1 loads. I HATE it. Delayed ignition. like a flintlock. I may have a bad batch, but load a few first. Use magnum primers.

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Old February 18th, 2013, 06:38 AM   #3
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I tried 748 with 150g SSTs, 45 grains with WLR primers and 44 grains with CCI mag primers. Accuracy was ho hum. I felt it was too slow. Showed drag marks on the brass. The only powder worth bothering with is H4895. As for the Palmas Im going to try them myself this week. 43 to 45 g of H4895, COL 2.775. Test loads are assembled. I already don't like the seating depth. I can neither achieve base of the bullet to base of the neck or any where close to touching rifling which is where these bullets supposedly like to be (bolt action).
All of my serious loads use win brass, LC is only for plinkers. My mil brass is very inconsistent for weight/capacity.

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Old February 18th, 2013, 08:13 AM   #4
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Quote:
Originally Posted by Scouter 762 View Post
I tried 748 with 150g SSTs, 45 grains with WLR primers and 44 grains with CCI mag primers. Accuracy was ho hum. I felt it was too slow. Showed drag marks on the brass. The only powder worth bothering with is H4895. As for the Palmas Im going to try them myself this week. 43 to 45 g of H4895, COL 2.775. Test loads are assembled. I already don't like the seating depth. I can neither achieve base of the bullet to base of the neck or any where close to touching rifling which is where these bullets supposedly like to be (bolt action).
All of my serious loads use win brass, LC is only for plinkers. My mil brass is very inconsistent for weight/capacity.
Surplus normaly is set to a Coal of 2.80 with a 147 pill, with your 155's set your COAL at 2.82 or maglenth. They should close up better.

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Old February 18th, 2013, 01:16 PM   #5
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Originally Posted by 11e40 View Post
anybody loading w748 in 7.62x51 lc cases sierra 155 palma ? will be used in a m1a. thanks.
Couple of years back, I thought I would give W748 a try. Bought two pounds and loaded 300 + Lake City cases with WLR primers, Nosler 155 grain CC HPBT seated @ 2.810". Worked up a load to 44.2 grains of powder which chronographed 2674 FPS, SD = 12.1, and ES = 36.0. The load was consistent, easy to shoot, and good for plinking. It would hold the ten ring fairly good on a SR-2 target, but not as accurate as my H4895 loads so I didn't pursue W748 as a powder of choice in my M14 clones. This load only safe for my rifle, so work your load up.

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Old February 18th, 2013, 04:16 PM   #6
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I tried it years ago in my M1A. No accuracy improvement and it seemed dirtier than IMR powders. I still have part of that can upstairs in the attic.

I may get it out this spring and see if it is still good (over 30 years old and stored in the attic all these years.) I got some of the IMR cans down a year or two back, oh, and the Hogden powders and they were still good. I used the IMR4895, the BLC2, the H335 and the H322. We worked on loads for my son's AR15 and M14S. We ended up with H335 for his AR15 and IMR4895 for the M14S.

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Old February 18th, 2013, 04:31 PM   #7
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H-4895 is my only powder for M-1A and the AR-15.

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Old February 18th, 2013, 05:22 PM   #8
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I bought some because it was all they had in stock and the crusty old fat guy claimed it works great in garands and M1As.

After doing a load workup I came to the conclusion that it sucks. Maybe for ball ammo blaster loads but otherwise Varget and 4064 gave me groups that were half the size.

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Old February 18th, 2013, 05:50 PM   #9
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I bought 1 pound recently. I am going to try it in my ar10. If it doesn't group I will use it for plinking.

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Old February 18th, 2013, 06:14 PM   #10
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Other Good Options? Varget and AA 2520!

The physical characteristics of AA2520 (micro-tiny balls that meter with absolute precision) and NEVER showing powder bridging or clogging events, plus the accuracy reputation of Varget with the correct weight bullets, has impressed me, a crusty old (fat) guy with >> 45 yrs of handloading experience under my (expanding...) belt!!

(Q: are there weight-reducing French cheese spreads I could switch to?)

Varget: Use Varget with heavier bullets in the weight range for 7.62s. (155 and up)

The Hornady book lists 44 gr of Varget with a 155 weight A-Max bullet and commercial cases.

I use 42 gr Varget in L-C head-stamped mil-surp brass, CCI 200 for 2680 fps. No pressure signs.

With commercial brass, such as W-W., I raise the loads of Varget to a starting load of 41 gr, up to max of 43.2, as per the Hornady book.

(For bolt guns, etc., you have other options with both types of brass. The M1A receiver, however, requires lower pressure loads at the point that the bullet passes it, and that do not thus create pressure-port problems and thus op-rod cycling or damage issues.)

Remember, with such mil-surp (for example, the prolific and readily available LC...) brass, you need to reduce listed initial loads, to a safer 41 grains of Varget, and then measure case powder "fullness" (do you see or experience powder compression for example?) before seating the bullet, case base over-expansion and other signs of over-pressure after firing.

This is because those mil-surp cases do have less case volume and it's easy to create an over-pressure condition with seemingly normal loads if you use the max loads listed in manuals for normal but thinner-walled commercial cases.

AA2520: Accurate Arms 2520, the "Palma Powder", has shown to generate particularly accurate and clean-burning loads. I've tried, with excellent results in my one-year old (as in: new) SA NatMatch M1A, AA2520 loads as follows (for Service rifles: bolt rifles can sustain a few grains more powder; consult your reloading manuals, but always start a few grains below max listed loads!):

Commercial W-W brass: 43.0 gr AA 2520, CCI 200; 155 gr Horndy A-Max: 0.8" accuracy @ 100 m., 2700 fps.

LC Mil-Surp brass: max: 41gr of 2520, CCI 200, 155 gr H A-Max. 2650 fps.

AND PLEASE NOTE: this author is not responsible for reload results in your particular rifle, or for possible misprints, copying or typo errors. Use caution when using any loads provided by outside parties, and be aware that Springfield Armory does not approve of handloads in their M1A rifle products.

In fact, Springfield Armory Inc. will cancel the warranty on your rifle if they determine you have ever used handloads in it! So... if communicating with them on problems with your rifle for other reasons than accuracy or cycling performance, do not tell them that you have used reloads, while also providing them your s/n! You'll be sorry!)

Springfield's legal and practical reasons for this absolute determination is not that it's impossible for an educated, seasoned and reasonable handloader to build a perfectly safe load for an M1A in good condition. No, it's that these rifles are particularly sensitive to case pressure, port timing and the correct and complete chambering of a new round into the chamber before the floating firing pin might slam forward and pre-detonate a partially chambered round.

This is called a Slam Fire condition, and as such it allows the round to be discharged while the rifle's chamber is not fully locked up. The possible consequences are imaginably problematic!

Thanks from 41magmafia
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Old March 16th, 2013, 12:37 PM   #11
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Thanks for the heads up. I tried 41-42 grains with the 147 M80 in LC cases. 41.5 was a good one in my rifle. Haven't chrono'd the load yet but was looking for something cheaper than Vihtavuori Powder which my rifle seems to lust after!

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Old March 16th, 2013, 05:03 PM   #12
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748, if you can't find H4895, 4064 or Varget.
748 does meter great. Varget is like metering toothpicks.
LG

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Old March 17th, 2013, 04:59 PM   #13
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Quote:
Originally Posted by lumpy grits View Post
Varget is like metering toothpicks.
LG
If Varget is like tooth picks, 4064 must be like power poles?

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Old March 17th, 2013, 05:08 PM   #14
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If Varget is like tooth picks, 4064 must be like power poles?
Neither meter worth a dang through any PM.
I can't put enough 4064 in s Fed .308 case to get it up to the speed I want.
Varget is my first pick for the .308 in 168 & 175gn SMK bullets.
LG

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Old March 17th, 2013, 05:22 PM   #15
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Originally Posted by lumpy grits View Post
Neither meter worth a dang through any PM.
I can't put enough 4064 in s Fed .308 case to get it up to the speed I want.
Varget is my first pick for the .308 in 168 & 175gn SMK bullets.
LG

LG just busting your chops, every once in a while I get a kernel that hangs up on my PM with Varget maybe 1 in 25 witch I feel is great, with 4064 its about 1 in 10.

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