.223 / 75 grn hornady A-max / AR platform?

Cocked&Locked

Cocked&Locked

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All my information shows this bullet seated to far to feed from a mag....does anyone have any load information I can work up to shoot it from a mag, or is it going to be a single load proposition?

I'm hoping to use reloader 15, though varget or something else may be tried in the future...

Thanks all

Cocked&Locked
 
I shoot the A-max from my bolt gun, however know people who shoot it from an AR, I believe for an AR, it is a single load....same from my bolt gun. Seated too deeply of loading to mag length.
 
Cocked&Locked said:
All my information shows this bullet seated to far to feed from a mag....does anyone have any load information I can work up to shoot it from a mag, or is it going to be a single load proposition?

I'm hoping to use reloader 15, though varget or something else may be tried in the future...

Thanks all

Cocked&Locked
Click to expand...

As pointed out, the 75 grain Amax is single load for the AR.
If you want mag fed rounds, you can substitute the 75 BTHP which can be seated far enough in. Reloder 15 and Varget are virtually the same as far as burn rate, but Varget is temp insensitive. Varget is the sh!t!:D
24.5 grains of Varget does nicely with the 75 hpbt, seated to 2.25" oal
 
beltfed said:
As pointed out, the 75 grain Amax is single load for the AR.
If you want mag fed rounds, you can substitute the 75 BTHP which can be seated far enough in. Reloder 15 and Varget are virtually the same as far as burn rate, but Varget is temp insensitive. Varget is the sh!t!:D
24.5 grains of Varget does nicely with the 75 hpbt, seated to 2.25" oal
Click to expand...


if I could FIND the 75 brhp, that's what I'd have got. I have 0 luck generally trying to find anything heavier then 60-62 grn. I saw a (1) box of the 75 grn A max at gobles so I snapped em up, sucks if I can use them through a mag though. I have a friend with a 223 bolt gun, maybe If it's got quick enough rifleing I can load them for that.......and keep looking for the hpbt's.....sigh

Is the length difference between the A-max and the HPBT that much that you couldn't seat it to the same length? If the full diameter section is the same lenght, it should generate the same pressure. I've considered loading them to the starting load (the A max to the HPBT load) and see what they look like........

Does anyone have the hornady manual 7th edition? they should have write up in there I hope..
 
O.K., measured both and this is what I've found:
Average oal of the 75 bthp is .950"
Average oal of the 75 amax is 1.090"
Now understandably, you can't really count the OAL of the bullet as it seats on the ogive, but it does matter when you're concerned with mag seating.
The ogive is different on the two bullets; the bthp being a tangent, while the Amax is a secant.

From the Hornady 6th edition:
Amax: COL 2.390" B.C. of 0.435 BTHP: COL 2.250" B.C. 0.395

The BTHP doesn't loose much to the Amax on paper

Russell's and Wholesale's carry both. Another alternative to the 75gr. HPBT is the Sierra 77gr. Match King, which can be seated to mag length.
 
yep. If you shove the amax in far enough to mag-feed, it will either use so much case capacity that you get lousy results or your case neck will be on the ogive. Which is why I told you, months ago, to go with the HPBT (as in the above link). In the spirit of rubbing things in, "I was right" :)
 
acrashb said:
yep. If you shove the amax in far enough to mag-feed, it will either use so much case capacity that you get lousy results or your case neck will be on the ogive. Which is why I told you, months ago, to go with the HPBT (as in the above link). In the spirit of rubbing things in, "I was right" :)
Click to expand...


Welll, I think I know what I'm gonna do with this box now, I'm gonna mount it in a suppository configuration for you tommorrow night with the toe of my boot.....sheesh, what passes for friends these days...:D to be fair to myself (and flap my ignorance nationally :redface: ) I thought these where the same bullet but without the HP....:runaway:
 
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