75gr amax in AR15?

D

daroccot

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I'm trying different loads out and would like some feedback on what I might try to do with these amax.

The rifle is 20" 1:9 on an AR15 platform. Powder presently used is Varget.

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Is this configuration on the left a viable option to keep COL at magazine feeding length while increasing case capacity? are there any dangers going this route?
 
Paulinski said:
You can load up to 77 grain to magazine length. You 1/9 might not stabilize the heavy (long) bullets. The only way to find out if to shoot them.
Click to expand...

So you are saying load the one on the right? Yes I'm aware they may not stabize in a 1:9 barrel, but as you said the only way to shoot it and find out. I was hoping I could get a faster velocity from the increased case capacity on the left.
 
2.260 if a max OAL in order to fit in the magazine.

You can load longer my 7th edition Hornady stated 2.390 COL for 75gr A-max but you would have to single load them.
 
Paulinski said:
You can load up to 77 grain to magazine length. You 1/9 might not stabilize the heavy (long) bullets. The only way to find out if to shoot them.
Click to expand...

Not true. A 77 grain FMJ or BTHP with a tangent ogive will be much shorter than the plastic-tipped secant-ogive VMAX
 
The one on the left will likely not feed - the open tip will strike the receiver below the feed ramps unless you have the M4 cut. The one on the left looks like it's seated past the beginning of the ogive - what prosper said is correct, some 75/77 grain bullets will work (think hornady HPBT 2279 ) others won't.
 
Don't waste your time deep seating the 75Gr A-Max. They are made for single shot loading and are not designed to be fed from the magazine.

Even with a overly long COL ( I use 2.450" ! ) you still need to compress the #### out of the Varget. To seat so deep to fit in your mag you will cringe when you are seating. Unless you "formed" your seating stem ( with epoxy / jb weld etc ) you will leave a ring on the bullet

You would have to reduce the charge weight so much that it negates the advantage of the 75Gr A-Max

There are lots of other heavyweights out there that can be seated to fit in mag ( Berger , SMK ). The A-Max is the exception because of the polymer tip makes it long for it weight

BTW : It says on the box of 75Gr A-Max that its for 1-9 twist. You would think Hornady would know what they are talking about

I love shooting the 75Gr A-Max and don't mind putting up with the single shot loading . You should get a single shot follower for your mags
 
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I was using 75 gr Hornady match in my Colt Hbar match gun and ran them through the mag...worked flawlessly. I seated them to fit the mag and charged the rounds with 4064. I got reasoable velocity and fantastic accuracy. I did eventually settle on the 69 gr Sierra match...again with 4064.
They shot just a bit better then the 75's, though not dramatically.
Cheers
 
Well I loaded some up with 25.0gr varget to a COL of 2.440, I will single load, the charge was minimaly compressed. I also have 20 69gr SMK's in a varity of charges(at magazine compatable length) I'm going to test. I'm trying to get something that will shoot well to 500m. If these don't work out for the AR, I'll save them for the bolt bun.
 
As already indicated, the 75 grain Amax and the 75 grain HPBT both produced by Hornady are very different animals -don't confuse them.

I have moved away from the Hornady bullets once they raised the prices to be more in line with Sierra match kings.....
 
The only 75gr AMax reloads I have seen fired that fit in a AR type mag were fired through an SL8. Shot really well.

Benchmark, CCI 450 and various headstamp brass (mostly Rem me thinks) was used with excellent results. 1.5MOA type accuracy at 550yds and definitely sub min of bad guy at 1000yds.

If your Varget load is a bit compressed, even better as that ensures the bullet cannot jam into the case during feeding.

The last time I checked, the new 600bullet bulk boxes of Amax were alot cheaper then MK's. I really like how accurate the Amax are at extreme range.

When working up a load in this case, you really need to go up in small increments. .2gr is max for increments. I went up in .1grs and saw a difference in my 1 mile rig.

25gr of Varget seems a bit hot to me but YMMV

Jerry
 
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