There doesn't seem to be an exactly proper forum for posting the following. I haven't seen any other threads with Remington velocity reports, so I can't add to them. I'll put it here and hope the AR15 persons find it.
Two boxes of the new Remington ammo arrived earlier this week from Midway, thanks to go2boats posting of the product number. The two boxes were from different lots. The one I took to the range is Lot #L07_NC16R.
The Pact chrono screen center was set about nine feet from the muzzle. The gun was the new bolt gun described in other posts; barrel was 26",1:24" twist, 0.451" nominal groove diameter. Chambering was SAAMI-spec 450 Bushmaster. Temperature was about 55 degrees F. The wind was blowing from 12 o'clock at about 20-25 mph, and the rate of fire was sufficiently slow so that the barrel was never really more than about body temperature.
The five rounds of Remington ammo gave these velocities (fps) in the order fired: 2028, 2122, 2081, 2049, 2050. Ave=2066; sd=36.6
Data for the second round is real. There was no obvious reason why the value should not be included in the data set. The target showed a similar anomaly for that round (below). If you want to give Remington the benefit of a doubt and toss it out, then Ave=2052, sd=21.8.
Five rounds of Hornady factory ammo, lot #3080494, gave these velocities: 2216, 2233, 2256, 2249, 2231. Ave=2237; sd=15.8
The five Remington rounds went into a 2-1/4" group. The second round was a flier. Neglecting it brings the group size to 1" for four shots.
Four of the Hornady rounds were shot for group, and went into 1". The fifth round was intentionally shot on another target.
Just as a side note, the first five rounds were handloads with new Hornady cases, CCI No. 41 primers, Hornady 250 gr FTX bullets, with an increasing charge of Lil'Gun, 35-39 gr in increments of 1 grain: 2299, 2352, 2352, 2407, 2382 fps. (These data are given for information, not as any recommendation.
I've likely omitted important information, and I'll try to provide it if asked.
--Bob