Which one did you get?  He has a few options.

It probably will improve.  I’ll use a bipod next time and hopefully get 1 MOA with the MiniMags.  Almost there now.  

Thanks for the update!  I'm glad you are pleased with the Beyer Barrel.

Looks good. Surprised the CCI SV didn't group better. They usually group pretty good for me in most of my 22s.

After over 3 months of waiting my replacement barrel arrived.  I’m pretty happy with the Beyers barrel I’ve been using so the new CMMG (16”, medium profile) will go on the EE.

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You're only a receiver away from a second upper.

I know.  I need to get rid of this barrel before it’s too late.

Glad it worked out 👍

Very nice results .

I have to say I am surprised the Mini mags shot better than the  CCIstd . Mini mags in everything I have shot them in are a good reliable ammo that has somewhat
larger groups than CCI std.

Another to try is Wolf. In most guns the wolf shoots tighter groups than CCI Std but there is always a couple of flyers that causes the wolf to score very close to CCI Std.

Another round to try is CCI Blaiser if you can find it. Usually has a velocity lower than mini mags but a bit faster than CCI Std.

Top of the line Eley is great stuff but usually the lower grade Eley shoots just as well in most guns unless you have a cray top end gun like a anshutz or a Wather.

CCI claims Green tag to be their best ammo but I have tested it in many guns and never found it shot better than CCI Std. Generally the Green Tag is 2X the price of CCI Std .

Had a friend who claimed that CCI Std in the paper 50rd boxes shot better than CCI Std in the plastic 100 rd boxes.

Most of the target ammo is coated with oil or wax , I suspect leaving it in a hot car or truck will degrade it somewhat .

Had a friend who was big in all sorts of competition . He would test fire all sorts of brands and lot# of ammo in any rimfire gun then try to buy mutiple cases of anything he liked .

Bump for any updates from OP.

Or how to tag a thread.

I now have a collection of quality ammo to try, it’s just a matter of finding a calm day at the range. I’ll shoot at 50 yards from a bench.  Stay tuned.

I went out to the gravel pit and shot a variety of ammo.  I was shooting at 50 yards from a bench using a bipod and rear bag.  Milspec trigger.  5 shot groups.  Scope is a 1-6 Primary Arms LPVO.  I used a AAC Element 3 silencer the entire time.

Results:

CCI Mini Mag            1.0”
Federal Auto Match.  3.35”. (First shot went supersonic and was 1.5”  higher than the rest of the group.  All other shots were subsonic).
CCI SV.                      1.35”
RWS Target Rifle.       3.2”
Aguila Target.             1.5”
Eley.                           1.23”

I’m sure I could do better with a match trigger and a scope suitable for target work.  I was at 6X the entire time and the reticle was thick.  Next step would be a LaRue trigger and something like a Viper PST 5-15.  Or, I might leave it as is.  

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FWIW, Aguila SV is half the price and shoots exactly the same as Aguila Target in my barrels that prefer Aguila SV.

I suspect but do not know that Aguila SV, Subsonic, Target, Pistol Target and Rifle Target are all the same thing.