I chose to use some Wolf (Barnaul) 174gr FMJ poly-coated steel cased ammo since I had tons of it and needed to use some up.
The rifle....
The ammo....
1st 5 shots from factory 5-round mag for "warm up"....
2nd 5 shots from a 2nd factory 5-round mag....
3rd group: 10 shots from an older SGM 10-round mag. You'll see 8 (maybe 9) holes, but all 10 went through in this grouping....
...not too bad for being cold, using irons, and having astigmatism!
I put about 250 rounds thorough it and used all mags. The Factory mags worked just flawlessly as to be expected (if only Molot made 10-rounders)!
My older SGM 10-rounder mags worked perfectly. No issues with them. The 2 new SGM mags had some feeding issues on the first round and one of them also had feeding issues on round # 2 and #4 as well. I retested both mags after cycling through some other mags and they both still had issues with the first round, but all subsequent rounds fed fine.
Using the Csspecs mags was interesting for me.... When I first got them a while ago, I tested inserting them into the rifle without the bipod or scope attached, and they clicked in easily and fit perfect. But at the range with my bipod on, I had issues inserting them. It took me a bit to figure out that the Csspecs mags have a tighter curve to them than the SGM mags and my receiver-mounted bipod was getting in the way.
The mag was hitting on the joint of the bipod legs under the quick-release (not the mount itself). I could finagle the bipod out of the way to get the mag inserted, but it was not as quick and easy as normal. Same with removing the mag. I could take off my bipod and quickly and easily snap in the mag, discharge all 10 rounds, and then quickly and easily release the mag.
The mags worked great. I did have issues with one of the mags on its first use where the 1st round did not feed. But all other times they worked great. I also fired them without the bipod and free-standing and I could quickly discharge 20-rounds with a quick mag change.
So, the only issue with the Csspecs mags was actually my own fault by mounting the bipod to the receiver which impeded the quick and easy insertion and removal of the mags. I'll still use the Csspecs mags and swear by them. Will probably order a couple more. And I still like my receiver-mounted bipod.
All in all, a great day at the range. I love this rifle and it's always a joy to shoot.
:JGC