a two part question about ESs and SDs

[longrange1]

first this is more of a reloading question but i posted it here because this section gets more traffic so if you mods feel it needs to be moved please feel free to do so.



so the first part....whats the LOWEST ESs and SDs you guys have ever seen?

This is mine I shot yesterday...



second part...how many rounds needs to be shot over the chrony for you to say your ESs and SDs are solid?

This is 25 rounds today...round #1 was 2732 out of a clean barrel...



This is with round #1 taken outta the mix...

[bsumoba]

Lowest ES... zero Only 3 shots, but this rifle shot phenomenal in last year's CA State LR Championships.

This is my 284 Shehane F-Class Rifle.

https://photos.app.goo.gl/ZH7ArZe9xHFbgB4f1

This is a 6 Dasher

https://photos.app.goo.gl/5SS69a8WCR5EAQRv1

As cartridges get smaller, ES should generally be lower.

For larger cartridges, I think ES is acceptabe up to the teens. In small cartridges, it should be single digits.

SD is roughly about half of the ES.

I don't think one needs to shoot a whole lot of rounds to identify their ES/SD. I think 5-shots is more than sufficient.

[Kwikvette]

Here's a question; does the chrony have to be on for a certain amount of time before you go measuring things?

Maybe a stupid question, but I ask because whenever I reload, I leave my powder dispenser/scale on for at least half an hour before using it.

[russ69]

Here's a question; does the chrony have to be on for a certain amount of time before you go measuring things?...

If you get the same velocity 3 times in a row, it's good data. Bad data is always suspect but good data is always correct, because the chances of getting good data with a bum system is near impossible.

[longrange1]

a two part question about ESs and SDs

Lowest ES... zero [emoji6] Only 3 shots, but this rifle shot phenomenal in last year's CA State LR Championships.



This is my 284 Shehane F-Class Rifle.

https://photos.app.goo.gl/ZH7ArZe9xHFbgB4f1

This is a 6 Dasher

https://photos.app.goo.gl/5SS69a8WCR5EAQRv1

As cartridges get smaller, ES should generally be lower.



For larger cartridges, I think ES is acceptabe up to the teens. In small cartridges, it should be single digits.



SD is roughly about half of the ES.



I don't think one needs to shoot a whole lot of rounds to identify their ES/SD. I think 5-shots is more than sufficient.

damit and i thought my 1FPS was impressive LOL!!



it didnt hold up anyway and i knew it wouldnt...that was a once in a life time deal...i went out a little later and shot the same load and it was 12FPS.



what got me thinking about this is i had a load worked up that was 7FPS over 5 rounds...couple of weeks ago i shot 60 rounds same load over the chrony and the ES was 49FPS.



the load i shot today has been 8 and 9FPS the last 3 times out but that was only 10 rounds each time...im still pretty happy with a 14FPS ES over 24 rounds...minus round #1....all this was shot over a magneto speed but its not attached to the barrel so i can shoot all my load development with no POI shifts...




this is in a 6.5x47

23" hawk hill .293 neck

140g berger hybrid .020 off .290 loaded neck

varget and a fed 205M
i guess i should add that the only brass prep thats been done is the primer pockets have been uniformed

Here's a question; does the chrony have to be on for a certain amount of time before you go measuring things?



Maybe a stupid question, but I ask because whenever I reload, I leave my powder dispenser/scale on for at least half an hour before using it.

ive never warmed up a chrony...but i do give the FX120i 45mins to an hour.

[bsumoba]

damit and i thought my 1FPS was impressive LOL!!
it didnt hold up anyway and i knew it wouldnt...that was a once in a life time deal...i went out a little later and shot the same load and it was 12FPS.

what got me thinking about this is i had a load worked up that was 7FPS over 5 rounds...couple of weeks ago i shot 60 rounds same load over the chrony and the ES was 49FPS.

the load i shot today has been 8 and 9FPS the last 3 times out but that was only 10 rounds each time...im still pretty happy with a 14FPS ES over 24 rounds...minus round #1....all this was shot over a magneto speed but its not attached to the barrel so i can shoot all my load development with no POI shifts...

this is in a 6.5x47

23" hawk hill .293 neck

140g berger hybrid .020 off .290 loaded neck

varget and a fed 205M
i guess i should add that the only brass prep thats been done is the primer pockets have been uniformed

Don't pay too much attention to the velocities. Many guys get hung up on chrono's and the data that comes out of it. For a 6.5x47, if you are averaging around 8-14 fps for ES that is good for that size cartridge.

You got a nice setup. I like the hawk hill barrel and 140gr hybrid. On the next barrel, I would consider a slightly longer one (~26"). You could try H4350, but it looks like you got Varget shooting well so I wouldn't change or try it until you get a new barrel.

My 284 Shehane (F-Open gun) will do more like 10-16 fps ES if I had to guess. I only use a chrono in the beginning of a load workup to chrono the velocities of charge weights in a new barrel to get an idea of what the barrel is doing for speed. Then, the chrono goes away for a while until I actually work up an official load. I will then chrono it (5-10 shots max) just to make sure it isn't doing something weird for velocities and then I probably never see it again. I let my scores and X-count tell me whether there is something wrong. My barrel count matters more to me to keep it low than to sling rounds downrange to find out what my ES/SD is.

[longrange1]

Don't pay too much attention to the velocities. Many guys get hung up on chrono's and the data that comes out of it. For a 6.5x47, if you are averaging around 8-14 fps for ES that is good for that size cartridge.

You got a nice setup. I like the hawk hill barrel and 140gr hybrid. On the next barrel, I would consider a slightly longer one (~26"). You could try H4350, but it looks like you got Varget shooting well so I wouldn't change or try it until you get a new barrel.

My 284 Shehane (F-Open gun) will do more like 10-16 fps ES if I had to guess. I only use a chrono in the beginning of a load workup to chrono the velocities of charge weights in a new barrel to get an idea of what the barrel is doing for speed. Then, the chrono goes away for a while until I actually work up an official load. I will then chrono it (5-10 shots max) just to make sure it isn't doing something weird for velocities and then I probably never see it again. I let my scores and X-count tell me whether there is something wrong. My barrel count matters more to me to keep it low than to sling rounds downrange to find out what my ES/SD is.

[ozarkpugs@gmail.com]

0 to 2 is great and worthy of bragging , I have never seen it on my chronograph. What I look for is a small deviation between outings in extreme temp.defferences .If your load has the bullet exiting as the vibration is getting close to bore a few fps deviation will not effect accuracy much but if you are at or near the top of the latter it will . I don't know about everyone else but this makes me want to go shoot some bullets.

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