I recently received some 220gr RN powdercoated bullets
from Leatherhead and started to work up a load.
Chris from Leatherhead promptly returned a few emails providing me suggestions on COL (2.055 - 2.065) and potential loads for Lil'Gun.
I worked down from 8.2gr to 7.2gr of Lil'Gun and have settled on 7.6gr. I'm loading on a Dillon xl650 and have the powder drop set to 7.6gr (=/- 0.1gr).
Rifle: AR15 using a VLTOR A5 extension with A5H0 (3.8oz) buffer and FailZero AR-15 BCG
Barrel Maker, Contour, Gas Length/Port Size: Ballistic Advantage, Hanson Profile barrel with pistol gas and gas port size of 0.100 (opened up from factory 0.093)
Barrel Length and Twist: 8.3" 1:7inches
Magazine Brand/Size: Brownells 20rd USGI
Bullet Used (grain, manufacturer, type): 220gr Leatherhead RN powder coat
Powder Charge and Brand: Lil'Gun 7.6gr
Case Used: Converted LC brass
Primer Used: Sellier & Bellot SRP
Chronograph Velocity (20 rds):
High = 1028
Low = 960
Avg = 989
ES = 68
SD = 17
Any issues or problems: Occasionally the last round will hold-open on the carrier not the bolt.