The only "GL" reference I'm aware of is a ballistic coefficient model based on a flat nosed lead projectile. Think G1 or G7 numbers of more modern projectiles. However 4.01 is WAY to high for a BC number and is on the extreme long end of COAL. I would definitely take your own measurements.
They do make great stuff and it is always nice to have more competition in the market. Kind of seems like they are just trying getting their piece of pie though. Only thing different about it is vertical bolt release and "Integrated Self Leveling Scope system (patent pending)?" Unless I'm...
Great vid and great build! With my 24" proof I get about a 1" poi shift with an ultra 7 and gain an avg of 15fps with a 6.5 creedmoor. I have used an Ultra 7 on 6 different rifles and all have had varied impact shifts do to harmonics as woodnut stated but all of them had an increase in fps...
If you plan on sticking with the 147s I would learn to live with the length. Those will be moving pretty slow from a 20" barrel. I run a 24" with an Ultra 7 and opted to reduce the overall length on the stock end by going with a folding manners.