Extremely poor results... Lapua, AMAX, CFE & XBR

[JASmith]

I'm not educated enough to wrap my head around the statistical analysis stuff. Normally, I shoot five shot groups, but had an almost full magazine and there was only one point on the target left. This was my last shooting for the day and I decided to bang them off rapidly to heat the bbl up a bit for cleaning...

Understood.

Most of us are statistically challenged.

Rules of thumb for groups:

1) Some report 3-shot results because they are so easy to cherry pick.
2) 5-shot groups are better than 3-shot because it gives two more chances for the underlying distribution to appear.
3) 10-shot groups are better but burn a bunch of ammo

People tend to accept the 5-shot group as reliable even though repeating the exercise several times while tracking both group size and center is a better indicator.

Shooting more groups or more shots per group helps get more trigger time.

[BarrelNut]

Well, it's still in the negatives here for weather, haven't got out to shoot at all but did find a few more bullets to try. My selection was based on the OAL of the Bullet, and the Base to Ogive measurement. I then calculated the Ogive to Tip, and choose the bullets with the shortest Ogive to Tip measurement. This should get me closer to the lands without running into magazine length issues.

I found the following Ogive to Tip measurements:
123 AMAX = 0.583
123 Sierra HPBT = .5875
120 Sierra HPBT = .509
120 Nosler BTip = .535
107 Sierra HPBT = .614
130 Berger AR Hybrid = .630

I purchased the 100 AMAX even though I didn't find measurements, the 120gr Nosler BTips, the 120gr Sierra HPBT, and the 123gr Nosler Custom Comps since people say they have a longer Ogive and they have a .51BC.

I'm curious to try the 100 AMAX @ 2.250" OAL and XBR/CFE, since others with this load in the Radical Grendel II Chamber have had decent luck with it.

[D.Davis]

100 AMAX shoots very well in my rifle. Dave.

[BarrelNut]

Do you have a radical / Grendel II chamber Dave?

[D.Davis]

Lilja Grendel barrel. Dave

[tj_farmer]

Did the rifle come with an accuracy guarantee? I wouldn't expect anything but functionality, and even that's a stretch for what they're offering these at.

Look at some of the reviews outside of their own site.

my buddy had a problem with a radical, they had it for a week when he sent it back shoots .4-.7moa now, he said they were excellent to deal with....he said when he called if the gun was shooting over 1.0 moa with good weather, marksmen, and ammo, somethings not right...a lot of reports of .5moa...mine shoots .3-.5 with hornady amax factory ammo with a bipod and a bag. Nothing wrong with radical as a company. but they do push out ALOT of uppers and guns. I think they said the week of the exc. orders they had 4500 orders that week

[LRRPF52]

my buddy had a problem with a radical, they had it for a week when he sent it back shoots .4-.7moa now, he said they were excellent to deal with....he said when he called if the gun was shooting over 1.0 moa with good weather, marksmen, and ammo, somethings not right...a lot of reports of .5moa...mine shoots .3-.5 with hornady amax factory ammo with a bipod and a bag. Nothing wrong with radical as a company. but they do push out ALOT of uppers and guns. I think they said the week of the exc. orders they had 4500 orders that week

On AR15.com, there have been several instances reported of barrels untorquing just from being fired.

Radical said they had a bad batch from one vendor, and seemed to be trying to handle the CS side of it reasonably. The comments I found the most interesting were the ones from people in the area who visited their location.

[BarrelNut]

Well I shot it again today and it was all above 1MOA... I took some measurements on the break and found out it is off center. Any chance that could be causing an issue?

I emailed Radical and talked with a rep named Neil. We'll see what happens here.

Break 2.jpgBreak 1.jpg

[BarrelNut]

And just to show I'm a capable shooter, here's a couple groups out of my Savage

File_003 - Copy.jpeg

[LRRPF52]

The chamber is the big thing. Anything not concentric on the muzzle isn't going to help matters though.

[1911man]

Well I shot it again today and it was all above 1MOA... I took some measurements on the break and found out it is off center. Any chance that could be causing an issue?

I emailed Radical and talked with a rep named Neil. We'll see what happens here.

[ATTACH=CONFIG]7610[/ATTACH][ATTACH=CONFIG]7611[/ATTACH]

Can you take the brake off to test it without it?

[tj_farmer]

call radical and I think the guy I talked to was Tim before I bought mine

[tj_farmer]

on the barrels loose, was this recent? I thought what I read and asked them on was from last year? do you think the chamber/barrel isn't setup correctly? theres a ton of Grendel 2 uppers shooting very very good out there to say its the chamber spec. itself...I know some guys seem to think it can only be done one way.

[BarrelNut]

Can you take the brake off to test it without it?

The break is on there pretty dang tight....much tighter than I ever set my 5.56 breaks. I'd rather have the company mess with it.

[1911man]

The break is on there pretty dang tight....much tighter than I ever set my 5.56 breaks. I'd rather have the company mess with it.

I doubt the brake is the problem, but if you take it off and shoot without it you can eliminate that variable. I had a problem years ago with a muzzle brake that I couldnt figure out. My rifle was shooting great before installing the brake and then after it shot like crap. I took the brake back off and the gun was back to normal. I sent the thing back to where I bought it from. I have had several muzzle brakes on several fire arms and never had an issue except that one gun.