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Joined: Feb 2001
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Well my 2.48" OAL shot and functioned in 2 AR style rifles my 1-9 twist 20 " Bushmaster did not like the 75 gr about 4.5" groups.
The Ruger 556 16" 1-8 twist grouped under 2". Both fired with no fail to feed.


kk alaska

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Yeah, 9 is too slow for 75s as a general rule.


Islam is a terrorist organization.

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Originally Posted by NVhntr
Originally Posted by tex_n_cal
Fooled around some with a 1 in 9" .223. The 77 TMK was around MOA or so. The Berger 77 OTM did much better, and is a bit shorter bullet. I'm going to try it in a 1 in 7" Mk12

I bought three of the ASC mags, which allow an OAL up to about 2.31". Will try some 75gr Amax and other bullets, to see how they shoot.


I checked out the ASC site and saw that they make OEM mags for several manufacturers. Got me thinking...I have several different brand mags, plastic, steel and aluminum.
Got out the calipers and did some checking on the OAL possible with each.

Pmag plastic - 2.266"
Wilson Thermold plastic - 2.274"
Bushmaster Stainless - 2.313"
AR Stoner Stainless - 2.310"
Colt Aluminum - 2.264"

So, I think I will load up some 2.3" OAL loads and give em a try.
Always thought I was limited to 2.26"


The standard for function with the old AL mags we used for years, was always 2.250. There is no reason that others can be built a bit differently and as you found, you might be able to extend a hair... would be evident if you stuck a 2.250 round in one of the longer mags by looking at it, that it can take a bit more.

As long as there is a bit of free play you are fine.


We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
Joined: Jan 2005
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The other thing to remember, most bullet seaters seat off the ogive, and bullet OAL varies a hair especially wiht OTM type bullets, so take that into consideration when setting up the seating die.


We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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