Load development question

[chazroh]

I loaded some 308 to test today, both shot decent(room for improvement) question is, both loads kinda shot two groups? Guessing that is shooter error?
41.5 gr load had an es105, sd39
42 gr load had an es20, sd 8
5 shot groups

 

[Ready_fire_aim]

Probably shooter error. That being said, those groups look pretty good! What are you shooting off of? Sandbags? Lead sled?

 

[chazroh]

Bipod on the front, sandbag at the rear.

 

[chazroh]

 

[Ready_fire_aim]

Ah ok. Honestly I’d be tempted to blame the bipod. What brand is it? Most of the less expensive ones are not as solid as they should be

 

[kwaynem]

I shot 3 different loads for the 300wsm a while back and all 3 loads shot about .870 in the same group

 

[chazroh]

Ah ok. Honestly I’d be tempted to blame the bipod. What brand is it? Most of the less expensive ones are not as solid as they should be

It’s an atlas

 

[Ready_fire_aim]

It’s an atlas

Well hell you’ve got a good one then.

Could it be a slight variance in the powder charge? When I’m trying to get really tight groups I always trickle/measure each powder charge on a beam scale

 

[chazroh]

Well hell you’ve got a good one then.

Could it be a slight variance in the powder charge? When I’m trying to get really tight groups I always trickle/measure each powder charge on a beam scale

That’s why I’m thinking it’s shooter error. I trickled these on a digital scale, then double checked on a beam scale.

 

[Bocephus123]

I loaded some 308 to test today, both shot decent(room for improvement) question is, both loads kinda shot two groups? Guessing that is shooter error?
41.5 gr load had an es105, sd39
42 gr load had an es20, sd 8
5 shot groups
View attachment 301757

Ain’t bad