Testing 5.56 ammo for my 1in7 barrel

[Pathfinder5243]

I’ve been doing some research on testing out a few different rounds for my 1in7 barrel. I decided to start on the low end with a box of IMI 5.56 77gr HPBT-“Match” and Frontier 5.56 NATO 75gr BTHP “Match”. The two boxes of 20 rounds arrived today and just at a glance, this IMI ammo is some pretty sub-par ammo if the manufacturing is this way all around. Attached are two photos showing the neck of each round.

Opinions and suggestions are always welcome.

 

[Granite3]

Reloads or first run ammo?

 

[Pathfinder5243]

Reloads or first run ammo?

BNIB. The IMI has flat crimp spots on all sides of the neck causing flat spots on the bullet itself which left tiny flakes of brass in the box.

 

[Defuzilier]

I have some IMI coming in today that I will check for the same. What lot # do have?
Black hill is the standard but harder to find and pricey.
PSA has AAC 77gr for .55/ea, from what I have seen the velocity is a little lower but it seemed to hit at or near peak velocity in a 16"

 

[Pathfinder5243]

I have some IMI coming in today that I will check for the same. What lot # do have?
Black hill is the standard but harder to find and pricey.
PSA has AAC 77gr for .55/ea, from what I have seen the velocity is a little lower but it seemed to hit at or near peak velocity in a 16"

To be honest I didn’t note the lot number and I only bought the one box. It definitely grouped better than my standard 55gr but I had the best results from the Frontier 75gr. I have some black hills and two more boxes of IMI coming in next week to compare.

 

[Defuzilier]

I checked a few of the boxes and didn't see anything like what you have pictured. The crimps on mine were a lot lighter. Just enough to notice that it was crimped.

 

[Hayata]

Brand of barrel? Length?

 

[Bennyboy]

I’ve had very accurate results from the Hornady Black 75g from my BCM.

 

[Pathfinder5243]

Brand of barrel? Length?

Ballistic Advantage 16" 5.56 M4 CARBINE LENGTH CHROME LINED AR 15 BARREL, CLASSIC SERIES

 

[Pathfinder5243]

I’ve had very accurate results from the Hornady Black 75g from my BCM.

How do you like your BCM? I’m looking for a new rifle and I looked at a RECCE-16 MCMR LW today at GFL. They seem a bit expensive @$1600. I’m also looking at a DDM4V7 Pro and a Geissele Superduty but I’m open to others as well.