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Originally Posted by tex_n_cal
Originally Posted by SMACK


I've cut the front out of P-Mags to shoot the 75gr A-Max. I also use the the same mags for my 6x45 with the 100gr Hornady BTSP.

[Linked Image]


How much can you increase the OAL, doing that?


Feeding from the magazine at 3.345 with the 100gr Hornady in my 6x45

[Linked Image]


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Originally Posted by SMACK


Feeding from the magazine at 3.345 with the 100gr Hornady in my 6x45


2.345, I assume you mean? That does seem worthwhile. I bought a few boxes of 75 Amaxs expecting a 1 in 8" single shot, which arrived with a 1 in 9" barrel frown Be nice if I could run them in the Mk12, at least it has a 1 in 7" barrel.


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You got it. Typo on my part.


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I don't recall the measurement for sure, but that one sounds about right.... take a mag, use a caliper, measure from the back inside to the front outside...that will about tell you...


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Some guys are even filing out the front of the mag well in the lower receiver, to get more OAL in combination with these cutout mags. That's farther than I'm willing to go at this point, but an interesting possibility.

For those who don't know, ASC mags will get you 2.300"+ without any modifications. I still like Pmags better for most things, but you're limited to 2.260" without cutting.

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Bump

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What answer are you looking for?

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Just trying to get as much knowledge as I can .
That's all .
Sorry it annoys you.

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Doesn't annoy me, just thought we were missing something.




Bump...

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SMACK,

Check your PM

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Originally Posted by Yondering
Some guys are even filing out the front of the mag well in the lower receiver, to get more OAL in combination with these cutout mags.


I slotted a 10-rd PMAG and with the 75 AMAX seated as deep as I dare, but the receiver on my AR still wouldn't accept it. I could see the receiver mod helping.


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Originally Posted by Soup
Just trying to get as much knowledge as I can .





The Horny 75 BTHP fits with room to spare compared to the 75 AMAX.




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I gave up the 75gr amax after it became obvious I would have to mod mags and receiver to use as a repeater.

Same deal with the .223 Montana, accuracy was only found at a length that would not even eject.

Happily using Hornady 75gr bthp in all .223s now, no mods necessary.

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once again... I've used 75 amax at 2.250 with no issues.... but some just tend to ignore experience...

No mag modifications... I used modified mags in the early 90s cut out mags just to run 75 jlks....there was never a need with the amax.


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Could you get them up to speed and how was accuracy with that kind of jump?


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Speed was enough, out of the mag, that it made a difference in wind drift at 300 yards.. which was the point of my playing.

Accuracy, lets just say I had numerous iron shot rapid fire 10 shot groups where I had 7-8x and the x is 3 inches in diameter.

Actual accuracy with a scope off bags was 10 shots into 1.5 to 2 inches or even a bit less at times depending on the particular barrel, at 300 yards.

IIRC the powder difference from a long round and a short round was around .7 grains less powder to the short rounds.

I've mentioned before, I control neck tension with neck bushings, and I generally ran full cases of powder, never had a setback issue.

Came REALLY close to the hallowed 10x-100 at Perry once in 300 rapid fire... just shot a called high shot, and a called 7 oclock shot to the coach in the string. He just shook his head and said yep, you are right. Both are out about half an inch or less, out of the X ring.... LOL. I"d thought I'd shot em out of the 10 ring. Had a couple of other 9X cleans along the way.

In the end, when the 77 sierra was pushed by enough powder, although it was never as accurate, it was an easier thing to deal with in the end in my mind, plus the short 75 amax scared the heck out my coaches, they just didn't like seeing it...

FWIW this in barrels throated to seat the 90 jlk bullet base just past the donut issue single loaded in the AR so there was considerable jump...


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Thank you to everyone for sharing their knowledge and first hand results with this bullet.
I got a LOT of great info from this thread .
Semper Fi
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I ordered 3 of the ASC mags. It will be interesting to see if they help one of my problem children.


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Originally Posted by Yondering
Some guys are even filing out the front of the mag well in the lower receiver, to get more OAL in combination with these cutout mags. That's farther than I'm willing to go at this point, but an interesting possibility.

For those who don't know, ASC mags will get you 2.300"+ without any modifications. I still like Pmags better for most things, but you're limited to 2.260" without cutting.



Does it make a difference if you get the stainless or aluminum magazines?


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I don't know. Mine are stainless; I haven't seen aluminum ASC mags personally (and didn't know they make them, to be honest).

Last edited by Yondering; 05/05/16.
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