| LoadID | 4377 |
| Bullet | Barnes Varmint Grenade |
| Bullet Weight | 36 grs |
| Powder | H335 |
| Powder Weight | 30 grs |
| Primer | WSR |
| Brass Make | Remington |
| Barrel Length | 24 (inches) |
| C.O.L | (inches) |
| Velocity | 3900 fps |
| Group 100 yds | .5 (inches) |
| Submitted By | NevadaBackroader |
| Gun Info | Cooper M21 |
| Comment | Starting load 27 grains. Stopped at 30 grains when target velocity was reached. No pressure signs. |