hollow point ammo in an AR

maurice

maurice

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I was just testing my AR with different rounds to check for feeding. It seemed to be that some HP ammo did not feed 100% reliably.
Could this be the a problem with the area that mattes up with the breach/chamber/ feed ramp and where it sits in the lower reciever? There appears to be a little bump as the rounds feed up into the chamber. It only happened so far when I manually cycled the firearm, haven't had any problems at the range with FMJ.
Also, when I remove rounds from the mag the way it would be cycled, the bottom of the brass (crimped area) appears to get caught on the front of the mag, just wear the top of the follower sits.
 
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I did a google, and it appears this can be a common problem. It was suggested a light polishing of the feed ramp area, to smooth it out, and remove any light burrs.
 
It is less a function of the hollow point but a shape of the projectile.

Long BTHP's like the 77gr Sierra or Noslers have a much more streamlined geometry than the short squat 40-55gr HP's.

I have many AR's that dont like the 40-52gr HP's that doe everything else okay
 
. Thanks Kevin! I noticed some mag works better than others.
I have some new RG mags, which have a different base plate section, the RG mags won't take the Magpul baseplate though but the magpul followers will go in with some effort. I just put on regular magpuls. I am trying them out tomorrow for functioning. I think the RG mags are steel?
 
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The RG mags are crap -- they where one the SA80A2 replacements (with the HK steel ones)

Some mags can sit higher or lower in the receiver due to manufacturing tolerances.

Quite frankly since TSE has the CProducts mags for $30 -- I would run out and replace all my mags with them...
(I'm in the process myself)
 
correction, it wasn't Federal BTHP 55gr, not sure what it is, but it is HP. I just opened a case of Federal BTHP, and they look more stream line in appearance, the open hollow point area is not as large.

I saw an article where it stated AR 180B worked well with RG mags, Not sure why but that is what the article said...?
I will try them out with the other crayola pack of different mags I have.

I trimmed a little off the mag where the cartridge rim was getting caught, as I noticed rounds that clear the front easily seemed to work better.
 
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Mo. Bring the rifle, mags and ammo in question to G17guy's place tomorrow night. I will be there by 9pm. There are some things you can do.

Moe
 
Might be able to make it over after 9:30pm. I will bring it over to show you exactly what I mean. Couldn't make it to the range today, got tied up with insurance and other stuff.
I am at the range tommorrow.
MO
 
I'd guess its a 50gr HP -- I got a bunch of them from somewhere -- I dont think it fed their guns either...

I know it did not work well in ours.

I will post a pic Sun or Mon of the various rounds (Mk262 -> craptastic 50gr)
 
thanks, interested to see what works. I have no idea where i got these rounds from...?, but it appears to be Winchester...perhaps a varmint round?
 
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I've had problems with the Winchester 45 grain HP.

The small weight of the bullet results in a large hollow-point tip area, which tends to get caught up on feed ramps.

I ended up single loading 140 of them up the spout after the first 10 jammed back into the cases when loaded in mags.

NS
 
NavyShooter said:
I've had problems with the Winchester 45 grain HP.

The small weight of the bullet results in a large hollow-point tip area, which tends to get caught up on feed ramps.

I ended up single loading 140 of them up the spout after the first 10 jammed back into the cases when loaded in mags.

NS
Click to expand...

sounds exactly like what happened to me.
 
Yeah,

I single-loaded them just to get rid of them. Drop one in the chamber, drop the bolt, fire the round, lock open on empty mag, drop one in chamber..... until all gone.

Not worth the effort to try and re-sell or whatever.

NS
 
Well the few boxes of winchester 45 grain ammo that I have right now are crimped pritty good, some sort of hexigon shape crimp(still might be to weak). I had bought a few boxes of AE 55grain fmj, wich were not crimped though. Still have yet to test any of them out in an ar 15(because I don't have my lower yet).
 
Used them today on the range, with some WinWB 55gr FMJ, Win Hp (45gr?), AE 55gr FMJ, and Federal 55gr BTHP, all fed well, not one jam, not one FTE or FTF.possibly the mag was part of the problem. Not being crimped they got stuck on the way out of the mag, but I trimmed the area to the front of the mag and they all worked fine.....!
All my mags worked well, including the RG mag.
 
DAR 701 said:
The Winchester 45 grain JHP CAN NOT be used in a semi-auto as they are not crimped! That ammo is a good way to have a kaboom.
Click to expand...

IIRC, they are crimped, but no cannalure?

The Remmy 45 JHP is crimped and has a cannalured (?) bullet, anyone try these?
 
The biggest issue I have seen personally and at work with HP ammo is the non crimped primers, they pop out when loading and when fired and get stuck in the lug recess and under the fire control parts, I had this happen at the Kamloops match.
 
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