Tasks:
Zero 2 new AERO 10 in AR uppers for the SBRs, .300 Blackout & 5.56 NATO @50 yds
Zero SA Hellion @ 50 yds
Status:
Success

Range report
The .300 upper used a Vortex 1/4 Crossfire II LPVO and the ‘bargain’ price point of the scope indicated itself by the inaccuracy of the advertised adjustments. The clicks for the purported 1/4 MOA moved impact a third farther than anticipated. Accounting for this, though got me on target pretty quickly and the zero stayed solid. Your mileage may vary.
What was a bit disheartening was the performance of the subsonic loaded ammo.
Dad had previously loaded 220 gr FMJ. I had recently bought some of Federal’s 220gr OTM “subsonic” ammo. Yet, with a Surefire RC2 .30 caliber suppressor, the report was quite loud. The range owner comparing it to an unsuppressed .22. However, grouping was very good as firing from over a range bag used as an impromptu rest resulted in a 5 round group a little under an 1 1/2 @ that 50 yds.

The 5.56 NATO upper, a back-up for my MK18 clone, has the same 1 power Vortez Spitfire Prism scope, which – unfortunately in my opinion – has been discontinued. I was first trying to zero with the 70 gr Barnes TSX load I have on hand, but this barrel didn’t like it so I changed over to standard M855 ‘green tip’. The advertised 1 MOA adjustments on the Spitfire are actually pretty close to that, but as they are that ‘bold’ unless you happen to luck into an impact point that’s dead bang on you have to put up with ‘close enough for government work’.

The Hellion is my first bullpup rifle (I don’t count a FN PS90 as an actual bullpup)
Zeroing the Hellion with M855 NATO using a Vortex Strike Eagle 1/6 LPVO was ridiculously easy. The scope was dead on for windage on the gun on the first shot and I proceeded directly to 50 yds.
I had to input serious come-ups but the scope adjustments were as advertised.
I’ve found it interesting that where I’ve used arms actually originally designed and made by/for the military establishments – as the Hellion was – I’ve always found them particularly easy to get zeroed.