acceptable ES / SD

[TackDriver284]

Before the heavy winds blew down my chrono 3 times last Friday, I was shooting the .308 Hornady ELD-X 178 Varget loads I made earlier during the hunting season and the Oeheler 35 printed out the velocity and SD. Looks like some fine acceptable ES / SD there. Eight shots into an 8/ 10 of an inch at 300 yards. I won't want to fiddle with anything, but my question is if you tweak with seating depths, will SD / ES change?

 

[jimbires]

I really can't answer this question on seating depth with certainty , but I would say yes it will . could get better , could get worse . I know it's a small sample , but your velocity numbers look great . one thing for sure , the results on the target are what matter . the target has the final say .

 

[5shot]

Not sure, but it doesn't always correspond to the smallest group. The best ES/SD is the one that makes the smallest group.

 

[waveslayer]

Not sure, but it doesn't always correspond to the smallest group. The best ES/SD is the one that makes the smallest group.

The seating depth my have an effect on it, depends on how much you change. Neck tension has a lot to do with it as well.

The ES and SD really don't effect group size, in theory it does. In the following picture is a clean cold bore shot then the following group printed with my 6.5 Creedmoor. My SD is 27.2 and my ES was 47...



My wife thinks I only have 3 guns

 

[TackDriver284]

Not sure, but it doesn't always correspond to the smallest group. The best ES/SD is the one that makes the smallest group.

The seating depth my have an effect on it, depends on how much you change. Neck tension has a lot to do with it as well.

The ES and SD really don't effect group size, in theory it does. In the following picture is a clean cold bore shot then the following group printed with my 6.5 Creedmoor. My SD is 27.2 and my ES was 47...



My wife thinks I only have 3 guns

It won't show much but past 600 yards you will see high and low hits due to wide ES. Low ES / SD contributes to smaller groups at extreme ranges. Correct me if I am wrong.

I have shot groups similar to yours and ES was bad.

 

[kraky1]

I have a scale that gets me down to one kernel of powder on a load.... I'm sure it was mostly luck but one day I actually had four in a row with the exact same velocity.... I felt like I shot them all very well.... the group was ho hum ordinary!
An example of one...I know....but it had me laughing.

 

[jimbires]

Tackdriver , here is a link to a thread I think you'll find interesting .


http://forum.accurateshooter.com/thread ... t-36689624

 

[kraky1]

I've been following that website for quite a while. I've been reloading for 20 years and there are people there that forgot more about reloading than I'll ever know!

 

[cloverleaf]

Eight shots into an 8/ 10 of an inch, 300 yards..... :shock: :shock: Really?!?!?!. If I ever shot a group like that the remaining rounds would be locked a away in a hermetically sealed funk and wagnels mayonnaise jar, locked in a lead lined vault, and buried in an abandoned missile silo somewhere in Gods country (and I'm not telling you where that is....) Oh I might send one round to NASA for evaluation. Maybe..... I couldn't mess with that, no way. Not brave enough. Great shooting!! CL

 

[woods]

my question is if you tweak with seating depths, will SD / ES change?

Yes seating depth will have an effect on ES & SD

 

[TackDriver284]

Tackdriver , here is a link to a thread I think you'll find interesting .


http://forum.accurateshooter.com/thread ... t-36689624

It was a great read, mind boggling that there are so many factors that can change ES / SD.

 

[TackDriver284]

Eight shots into an 8/ 10 of an inch, 300 yards..... :shock: :shock: Really?!?!?!. If I ever shot a group like that the remaining rounds would be locked a away in a hermetically sealed funk and wagnels mayonnaise jar, locked in a lead lined vault, and buried in an abandoned missile silo somewhere in Gods country (and I'm not telling you where that is....) Oh I might send one round to NASA for evaluation. Maybe..... I couldn't mess with that, no way. Not brave enough. Great shooting!! CL

Thanks Clover, I was glad I had my coffee before I started shooting. :lol: Hopefully the new lot of bullets I ordered shoots the same.

Emailed GA Precision that the Crusader shoots like a dream and asked them to build me another rifle, this time a 6.5 Creedmoor

 

[waveslayer]

Eight shots into an 8/ 10 of an inch, 300 yards..... :shock: :shock: Really?!?!?!. If I ever shot a group like that the remaining rounds would be locked a away in a hermetically sealed funk and wagnels mayonnaise jar, locked in a lead lined vault, and buried in an abandoned missile silo somewhere in Gods country (and I'm not telling you where that is....) Oh I might send one round to NASA for evaluation. Maybe..... I couldn't mess with that, no way. Not brave enough. Great shooting!! CL

Thanks Clover, I was glad I had my coffee before I started shooting. [emoji38] Hopefully the new lot of bullets I ordered shoots the same.

Emailed GA Precision that the Crusader shoots like a dream and asked them to build me another rifle, this time a 6.5 Creedmoor

Good choice, as about a 6mm Creedmoor, it's gaining traction! Or go big and get the 6.5 SAUM. Now that's hard to beat

My wife thinks I only have 3 guns