.224/ 75gr amax in a handload for the AR platform?

General Firearms Reloading & Ammunition
1

Is anyone handloading a .224 Hornady 75gr Amax for their ar-15 platform? If so, what C.O.A.L. are you using? What powder?

Can anyone tell me what the maximum length of that cartridge would be with a 5.56 nato or .223 wylde chamber?

I understand that the c.o.a.l. will be limited by the magazine…I am also curious what the c.o.a.l. could be if it were not limited by magazine length…

I have read the dimensions in the Hornady 9th ed. reloading manual…I believe the lengths are listed for a bolt action rifle though.

thanks!

2

FN barrel Nato chamber.
Using Hornady OAL gauge. Bullet jammed to land, the OAL is 2.527 more or less.

Tried it on AR (single fed), could not remember the powder but was I not happy with the result. I think i used the Hornady recommended OAL of 2.390

3

Will 2.390 fit in a typical AR 15 mag?

4

Nope. 2.260" is pushing it. 2.270" starts to rub, depending on the mag.

5

This is what happens when the 75 grain A-MAX is loaded to magazine length . . .

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6

Lots of folks use the 75hpbt

7

24gr tac 2.250 with the hornady 75bthp

Sent from my SAMSUNG-SM-G900A using Tapatalk

8

I use 23.5gr H4895/CCI450 with the 75gr BTHP, shoots great.

I never used the AMAX because of length restrictions but I recall seeing a picture of a magazine with the front cut out of it to accommodate the AMAXs semi-automatically, I’ll try to find the pic or more info.

9

Howdy,

That’s how mine look too.

For a 75gr bullet I use the Prvi Partizan 75gr BTHP-Match bullet with 25.3gr of BL(C)2 powder with a coal of 2.24.

Here’s a pic of a bullet that I fired into a cardboard box that contained a water filled trash bag. My “experiment” failed miserably and all I recovered was the lead core.

As you can clearly tell by the pic, eventhough the bullet is a “match” bullet it had excellent expansion. I fired is round from my 16.5" barreled shorty from 35’. I need to do a test at 100 yards.

Paul

10

You are better off using the new 77grain Sierra TMK than the Amax. It has almost the same BC and will load to mag length.

11

According to Dr GK Roberts, the Prvi 75 grain BTHP is not an expanding projectile. It yaws and then fragments.

Terminal Ballistic Properties of Prvi Partizan 75 grain OTM

Thanks to the efforts of the esteemed Dr. G.K. Roberts, we now have some excellent information on the terminal ballistic properties of the Prvi Partizan 75 grain OTM load. The same lot of Prvi Partizan 75 grain OTM ammunition that Dr. Roberts used in testing had a nearly identical velocity when I chronographed it from a 16" Colt barrel.

Privi Partizan 75 gr OTM

Velocity: 2468 fps from a 16" 1:7” twist barrel

penetration in bare ballistic gel: 12.6"

neck length: 0.8”

maximum temporary cavity: 3.2” at a depth of 4.7”

recovered diameter: 0.36”

recovered length: 0.15”

recovered weight: 30.1gr

percentage of fragmentation: 60%

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