Data for Hornady 75gr A-Max in .223


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ocabj
December 13, 2005, 01:25 AM
Does anyone have the latest Hornady manual? What is the listed COL for the 75gr A-Max for .223 Remington, and the minimum/maximum for Hodgdon Varget and IMR 4064 with the respective velocities?

Thanks.

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dmftoy1
December 13, 2005, 06:24 AM
I don't see a .223 listing for that bullet but I do see one for 5.56 Nato. Here's the listing:

http://www.fahringer.net/x/5.56nato.jpg

I'm on the sixth edition so maybe there's a newer one?

Have a good one,
Dave

P0832177
December 13, 2005, 11:18 AM
The Amax 75gr is meant to be seated near the lands of the barrel, and the OAL would best be determined by using a Stoney Point tool on your barrel!

Go to the Hodgdon web site and look up the 223 data using Varget. Work up the load and seating depths based on target results.

I think about 10 thousandths off the lands ought to work well! Your velocity will be a function of your barrel! You need to chrono the loads!

There are no shortcuts to safely reloading ammo!

ocabj
December 13, 2005, 11:47 AM
I don't see a .223 listing for that bullet but I do see one for 5.56 Nato. Here's the listing:

http://www.fahringer.net/x/5.56nato.jpg

I'm on the sixth edition so maybe there's a newer one?

Thanks dfmtoy1.

Yes, the 6th Edition is current.

The Amax 75gr is meant to be seated near the lands of the barrel, and the OAL would best be determined by using a Stoney Point tool on your barrel!

Go to the Hodgdon web site and look up the 223 data using Varget. Work up the load and seating depths based on target results.

I think about 10 thousandths off the lands ought to work well! Your velocity will be a function of your barrel! You need to chrono the loads!

There are no shortcuts to safely reloading ammo!
The reason why I wanted to know the COL listed by Hornady is because I am trying to load these to magazine length for an AR. While knowing the maximum charges listed by Hornady is important, I want to know the COL Hornady used when developing their data so that I know, ballpark-wise, how the data will be skewed when I seat the bullet deeper.

For the record, I'm going to play around with the 75gr A-Max in a 16" 1 in 7" twist, 556 NATO chamber.

dmftoy1
December 13, 2005, 04:59 PM
I'll be curious how it turns out for you. I"ve been playing with winchester 55 fmj bullets and have been able to seat them out to maximum COL and they seem to function fine in my AR magazines. I did notice that the XM193 ammo (which I'm trying to duplicate) is seated .013 shorter.

Have a good one,
Dave

ocabj
December 14, 2005, 12:16 AM
I'll be curious how it turns out for you. I"ve been playing with winchester 55 fmj bullets and have been able to seat them out to maximum COL and they seem to function fine in my AR magazines. I did notice that the XM193 ammo (which I'm trying to duplicate) is seated .013 shorter.

Have a good one,
Dave
Well, I just found out you can't seat the 75gr A-Max to magazine length for the AR. You *can* seat the bullets down to 2.250", but what happens is that the ogive of the bullet is seated below the lip of the neck of the case. I made 3 dummy rounds, loaded them in the mag and fast cycled them. One seated fine, then I cycled the bolt and the next one jammed. I pulled hard on the ophandle and when the 2nd case ejected, I found the bullet jammed all the way unto the case. There isn't enough neck tension if you seat the A-Max to mag length.

So I'm pretty much screwed at this point for these bullets. I'll have to go with the Hornady 75gr match bullets or the Sierra 77 MKs, which from what I understand, can be seated to mag length appropriately (the Hornady 75 is used in their TAP ammo line, and the Sierra 77 MK is the basis for the 262 MOD 1 cartridge).

P0832177
December 14, 2005, 10:53 AM
What were you thinking of using the bullet for? The VLD type of bullets are not meant to be shot at magazine length! DPMS has mag you could get, but you need change your magazine release as I recall. But, the 75gr Amax is not meant to be used for SD rounds!

Get the 77gr OTM or 75gr OTM and load as they are designed!

Master Blaster
December 14, 2005, 03:06 PM
These are match grade bullets for shooting 600-1000 yards in competition.

They are fed by hand, not from a magazine.

tikkat3
February 7, 2007, 05:43 AM
ocabj, just seen your post whilst trawling through the forum. I have the 7th edition Hornady manual. The data for 75gr A-MAX in .223 is:

Rifle: Colt AR-15, Citadel Bbl
Barrel: 20", 1-9" twist
Case: Winchester
Primer: Winchester WSR
COL: 2.390" (75gr A-MAX #22792) - SINGLE SHOT ONLY, otherwise max COL 2.250"
Max case length: 1.760"
Case trim length: 1.750"

Powder max charges:

2600 fps
IMR3031 - 21.2gr
AA2495 - 21.8gr
Viht N-135 - 21.8gr
AA2520 - 22.5gr
Varget - 23.5gr
Viht N-140 - 23.6gr
Viht N-540 - 23.6gr

2700 fps
H4895 - 23.3gr
RL-15 - 24.1gr
WIN 748 - 24.0gr
BL-C2 - 25.2gr#

Hornady's best results came with Viht N-140. Viht N-135 and AA2495 were excellent, but could not match N-140.

Hope this helps. I found that the max charges are substantially lower than Hodgdon for example. The ideal in my rifle for this bullet is 24.2gr Varget, which shows no over-pressure signs and is well within Hodgdon's max loadings.

bootster
January 27, 2008, 04:57 PM
Greetings,

I use these in a Savage 110 Police Tatical. The ogive of the bulled does not work with the standard seats in the standard .223 die. You will probably get a scant kink/ring in the bull just below the red tip. Hornandy sells the special seat to replace in their die set (the option I went for and purchased) or you can have RCBS make one for about $18.00. Additionally I get best results with Varget powder. I see no difference between Rem or Win primers.

-Steve

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