Reply To: Pellet head size and velocity differences

Forums Pellets, Projectiles, Slugs, & Ammo Pellet head size and velocity differences Reply To: Pellet head size and velocity differences

Link

clgraham82
Participant
Member

“sharroff”I took an unsorted tin of Crossman Premier’s out for some FT shooting and had groups way more open than normal (a rough hole at 50 yards is normal).  I had some side to side variation which I’ll call as wind but lots of vertical difference.  Came back inside and did the weight check.  They were almost all 7.9 and 8.0 with a few 7.8’s.  Nothing extraordinary there.  Checked the head sizes and there were all over the place from .450 to .453 which make a big velocity difference in my FT gun.

For 10 shot groups of these Crossman Premiers over my chrony:
.453 were around 970 fps
.452 were around 990 fps
.451 were around 955 fps

So 45 fps spread when those are mixed together vs my normal 5-10 fps spread.  At 50 yards, that’s a big difference.

 


Good info!  I’m having the same wide fps spread with my .22 Wildcat using both 15.9 & 18.1 JSBs.  I’m going to try some sorting and see if the strings tighten up.