I shot mine on Sunday, and used CCI Maxi-Mag 40 gr JHP and BVAC 40 gr JHP. The BVAC is US made but has the same headstamp as Armscor. I am assuming that it is the same as the US made Armscor. The CCI is one of the rounds that keyholed with my stock standard barrel.
The good news: The CCI does not key-hole. The grouping is not good (2 inches off a rest at 8 yds, 3 rounds) but they do hit the target nose first. The holes are round, not oblong, and certainly not a side profile of the bullet. The BVAC groups into about 1 inch under the same conditions.
The bad news: I had some failures to feed. This was mostly with the BVAC, and sometimes it short-stroked, but that happens fairly regularly with this ammo in my gun. The CCI sometimes stripped a round, but it didn't fully chamber. Both of these might be due to insufficient break in. When I installed the barrel for the first time, it was difficult to hand cycle. I took it apart and put more oil on it and reassembled. This helped. I had one round either fire out of battery, or extract while pressure was still too high. The back 1/8 inch of the case was shredded and I got a face full of particles. I am glad I had my eye protection on. This round was CCI. Some of the BVAC cases had rounded (bulged) case heads so that they would rock when I stood them up, and others didn't.
So far, I am happy with the barrel. Some of these issues may be related to a tight chamber, which is typical of match barrels. The recommended ammo may feed better, and I am not going to criticize the barrel for these issues, nor am I going to criticize its accuracy since I have not yet shot the ammo they recommend. The BVAC is not exactly match grade ammo, and I would expect the CCI to be better than it, but it isn't. I wonder if the issues with CCI might be related to this particular length of barrel coupled with their particular powder burn rate. I am looking forward to trying more ammo, especially the recommend 22 magnum Hornady 30 grain VMax. I don't have any of this ammo at this time.
buzzsaw