I finally have had my third range session ringing out the Palmetto 7.5" upper (
picture back on Post 1441)on my registered SBR.
Folded, this thing is 19.5" so I figure I can work one of these backpack solutions from the other thread. I passed about 750 rounds down range with no malfunctions today. Wanted to share my chrono data.
Temperature 80deg F, altitude 870 feet, 10 shot groups.
Barnes 110gr VOR-TX solid copper, black tips
Average: 2077.20
StdDev: 9.23
Min: 2064
Max: 2085
Spread: 21
Hornady 110gr GMX, solid copper red tips
Average: 2037.63
StdDev: 22.56
Min: 2014
Max: 2076
Spread: 62
Hornady 110gr VMAX (AMAX JHP, red ballistic tip, lead core)
Average: 2079.10
StdDev: 11.00
Min: 2066
Max: 2098
Spread: 32
What most impressed me was how tight all three rounds grouped from this barrel. I probably have the best upper of this type Palmetto ever made or the best barrel they ever cranked out or something. I was using a 2 moa red dot, Sig Romeo 5, firing groups at 2" circle stickers from 50 yards.
At that distance with my old eye sight it is difficult not to perceive the 2" target dot as mostly covered by the red dot, so my accuracy is not outstanding in the first place. However with this stuff, I am shooting tighter groups at that distance than anything else I can do with a non magnified red dot on any platform I own.
The Barnes 10 shot group, hell maybe this stuff is actually worth $2 a round...
Attachment 54649
The V-Max, a 20 shot group, again, with my old eyes and a red dot that practically covers the target dot at 50 yards, I will take this all day.
Attachment 54650
In terms of zero's I found about 1/2 moa difference at 50 yards between all three rounds, and light angle/shade/shooter error might even account for most of that.
I may have to stick a serious scope on this thing and shoot it once just to see what it can do.
As for its PDW capability with this optic and the Barnes ammo, it doesn't get any better for me....can't.