I didn't have time to shoot groups, because I decided to change the reg on my bottle build P-Rod. I swapped a Gurlleu 2200 psi output for a custom Ninja Reg set to 2500 psi, hoping the upped pressure will get me over 900 fps.
I shot various spinners from 25 to 42 yards with FX 18.1 to make sure my zero was still good. Then switched to the NSA. I was nailing everyone of the spinners at 42 yards, including the smallest one, which is about the size of the nail on my pinky. Good enough for the kid.
The NSA .2175s chrony the same as an 18.1 as well, so that means the fpe will be slightly lower at the muzzle, but with a better bc they should retain more energy downrange?
Here's the chrony results: High of 953, low of 942, average 948, ES of 11, SD of 3. I am looking forward to seeing what the NSA will do to a tree rat noggin!