AR mags for the Whisper? and some progress

[mstarling]

Have noticed that folks seem to use 20 round mags for the 300 Whisper. Is there a problem with 30s?

What mags have you found to work well?

All of my parts are in save for the Black Rain billet Upper/Lower pair and I expect those late next week.

The following parts will be used in the project:

16+" SS Paladin barrel and 3 position gas block
.308 caliber YHM Phantom flash hider/comp
YHM full length lightweight free floating handguard
RRA 2 stage National Match LKP
Mil-spec buffer tube with LMT SOPMOD stock

Have mocked up the barrel in another upper but not installed a gas tube so the Paladin 3 position gas block is set in the off position. Was finally able to make brass that works from LC 97 5.56x41 using a small base sizing die and a 300/221 Redding die set.

A load of 13.4 gr of 2400 with 147 gr FMJBT projectiles seems to do a decent job of fireforming the brass and is easily extracted. A subsonic load doesn't blow out the shoulder at all.

Single round feeding from old Colt or AdventureLine 20 rnds mags seems to work OK.

[nwcid]

I think the 20's are more popular since guys use guns with bipods. When using a bipod 30rd mags hang down too far. I use 20's in my guns that I use off bipods.

[Colohunter]

Originally Posted by nwcid

I think the 20's are more popular since guys use guns with bipods. When using a bipod 30rd mags hang down too far. I use 20's in my guns that I use off bipods.

I agree, I think the 20 rnd mags are more a preference of length. I have used 30rnd Pmags and 30rnd Cproducts magazines without an issue.

[cav_scout_tj]

The Cammenga ez-mag works great too, easy to load:

[strycnine]

Will the 20rd P-Mags work?

[Colohunter]

Originally Posted by strycnine

Will the 20rd P-Mags work?

My 30s work fine, I would think that the 20 wouldn't be a problem.

[nwcid]

Originally Posted by strycnine

Will the 20rd P-Mags work?

Thats all I run in mine. I could not get stock Colt style 20rd mags to feed in mine.

[Howlin' Mad]

I have a Colt 20 rounder that has worked flawlessly, a Pmag 20 rounder that has occasional FTF, and a Brownells 30 rounder that has also been flawless. Only mags I've tried so far.

I guess it all depends on your rifle as to what works or not.

[GaryM]

30s are great for 3 gun competitions and just having fun at the range. 20s are much better for shooting off bags and bipods and are just plain handier to deal with.
Besides, how often do you fire off 30 in a row? My fire pattern usually consists of 3-10 shots then a walk down range.