The OP was asking about 846 which is similar to BL-C2. You have 844 which is more like H335.
I've shot a lot of 846 through a M1 and it was flashy, but worked well otherwise. I'm afraid I don't have any experience with 844, but it does fall in the right burn rate range for the M1.
As far as "Bob" and his rounds goes, I found this thread on a google search. I replied not looking at when it was last posted.
That's why they have the old thread warning you had to acknowledge before posting.