Short action cartridges + polymer long action AICS mags ?

[NorthIdahoDude]

TL;DR - anyone know of a polymer long action AICS mags in the 3.715 format (ie: NOT CIP) that has feed lips that will feed short action cartridges reasonably? (Magpul's will not work)

The TL part: I have a long action Remington 700 that I have in a OEM SPS stock with Magpul bottom metal + AICS magazine. I was entertaining the idea of stepping down to a short action cartridge (6.5CM or 7mm-08), but a quick feeding test shows it won't feed reasonably with the Magpul long action AICS mag (30-06 variant), because the feed lips are overly short/release the cartridge too soon and the tip wants to hang up on the breech face. Long action cartridges (3.3 or more) are fine, because by the time the feed lips release, the tip of the bullet is already past the breech face.

Feeding short action carts out of a BDL/ADL mag works fine, because the OEM Remington feed-rails are substantially longer, and keep the short action round from popping up before the tip gets into the chamber.

And, yes, I'm aware of the metal mags designed for this, but my interest in a mag that weighs twice as much and will stop working if I ever dent/bend the feed lips is pretty low, TBH.

Assuming I don't want to convert this rifle back to ADL, does anyone know of one of the polymer/lightweight AICS magazines in 3.715 length format that has longer feed lips that would work for what I want to do?

Thanks,

Edit to add - if the feed lips extended to where i have the red line drawn, it would be fine.

 

[Floridave]

I use those long action magpul magazines with 243 cartridges with no problems.
It’s a long action Remington 30/06 that I Remaged to fast twist 243.


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[NorthIdahoDude]

I use those long action magpul magazines with 243 cartridges with no problems.
It’s a long action Remington 30/06 that I Remaged to fast twist 243.


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In what setup? I wonder if maybe the Magpul bottom metal places the magazine overly far rearwards in the action? Mine 100% will not feed 6.5 CM, and I've tried 2.8 OAL 308's in it, which work better, but still hang up somewhat frequently.

Maybe I should try some extra-long 7mm-08 or 260 and see what I get. Hrmm....

 

[Floridave]

Most of my rounds are loaded long but it feeds regular short 80 grain factory just as well. I’ve shot a couple hundred factory length 243’s. Here are some photos, the bottom ‘metal’ and mags work in either of these stocks from Stocky’s.
One of the magazines I shortened to only hold 3 rounds , doesn’t protrude so far down. I like that better when hunting.

Below are some pics, hope it helps.

I have same results with the lightweight carbon fiber stock and the heavy target stock.

These are my two mags. Both long action/30/06, one cut down to 3 rounds. Then a factory 80 grain and 112 match burner loaded long. I’ve not had any failures to feed in hundreds of rounds.

This is the factory 243, slow closing the bolt and the cartridge stays flat, in the magazine until it’s pushed up by the feed ramp.
Sounds like your cartridges are popping up earlier than that?

Oh, that is a Remington 721 action, which is pretty much exactly like a 700, the stocks and magpul bits are REM 700.


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