I have a 300 shooting 190 gr bergers ,h1000 , nosler brass and CCi primers . My es is real high 180 at 100 yds a 3 shot group all holes are touching. What can I do to lower this?
300 wm with high es
- Thread starter patrick021
- Start date
How did u measure muzzle velocity? Was it faulty equipment? For verification, if you shoot at 300 yards you will see a vertical string of ~2" with that velocity difference.
Sometimes switching primers can solve an issue like this, although maybe not an ES of 180.
Another one to check is neck tension of your brass. Were all of your rounds the same length?
Sometimes switching primers can solve an issue like this, although maybe not an ES of 180.
Another one to check is neck tension of your brass. Were all of your rounds the same length?
I'm using a pro - chrono . What is the recommended distance for the chrono to be in front of the rifle? I'll try to find somewhere to shoot 300 yds
Assuming your reloading practices are solid, an Es of 180 is crazy. I would be highly suspect of the chrono . I would try & get someone at the range to let you run some rounds over their magnitospeed or labradar.
Factory ammo is usually standard deviation in the 20's. My goal is single digit. Others might be doing better.
Good luck.
What an acceptable ES is can be highly subjective. I would suggest to start with, aim for something under 30 along with single digit SD's for reloads, factory would be higher.
