Follow up on reloading for ELR…

Feniks Technologies

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Also, for example sake, to have a 15es over a large enough sample, your sd would have to be 2.5fps

I’d love to see 100 shot string with a 2.5sd.

As the extreme spread breakdown would be close to

68 shots: 5 fps
27 shots: 10 fps
5 shots: 15fps


That would be an extremely good accomplishment.
 

badassgunworks

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They are related to what shows up on a target over large samples and long range but not when it comes to what is done in devlopment to obtain one or the other . I have seen tight groups 5 shots with poor standard deviation and seen great standard deviation with bad 5 groups this is why a ladder is preformed to find out that is happening you must know there are different types of ladder tests for different reasons you dont automatically obtain good s.d.'s when you get good group. As they are not related
 

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Looking at the data it is too perfectly linear to be actual chronological data so this is simply supposed to be illustrative. What I was pointing out was that at 3 shots the relationship to the CI at 25 shots was highly correlated. Looking at Ledzep's data though, his is pretty linear as well. The shoes back to my earlier point that very large sample sizes are unnecessary.

That said, if you have a magneto speed on your gun at all times, why not collect data for analytics.

-Alex

You’re definitely looking at the data wrong.

For example, here is the breakdown of a 5sd shot over a chrono. And the range your true sd will fall in over 95% of the time:


3 shots: 2.6 - 31.4
5 shots: 2.9 - 14.3
7 shots: 3.2 - 11.0
10 shots: 3.4 - 9.1
15 shots: 3.6 - 7.8
20 shots: 3.8 - 7.3
25 shots: 3.9 - 6.9
30 shots: 3.9 - 6.7
50 shots: 4.1 - 6.2
100 shots: 4.3 - 5.8
200 shots: 4.5 - 5.5
300 shots: 4.6 - 5.4

Why this matters?

When you shoot say a 3 shot string test and get one with a 3sd and another with a 7sd, you don’t have enough data to show much of anything. You could pick the 3sd and hope it’s better. But you’re not much better than a coin flip.

10-15 shots is where things start to stabilize.
 

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They are related to what shows up on a target over large samples and long range but not when it comes to what is done in devlopment to obtain one or the other . I have seen tight groups 5 shots with poor standard deviation and seen great standard deviation with bad 5 groups this is why a ladder is preformed to find out that is happening you must know there are different types of ladder tests for different reasons you dont automatically obtain good s.d.'s when you get good group. As they are not related

He can absolutely shoot .1’s and 2’s at 100/200 yards with a higher than 15es.

BR shooters do it all the time. Hence using powder drops.


Everyone knows at distance the SD matters.

Except the fact that people use that when it suits them. When their numbers aren’t small, the claim positive compensation.

When others numbers aren’t small, they claim it’s their SD that’s going wrong.


But no one ever seems to show up with data on long shot strings. Oddly enough.

This stuff would be incredibly easy to prove otherwise. Yet no one does it.
 

badassgunworks

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He can absolutely shoot .1’s and 2’s at 100/200 yards with a higher than 15es.

BR shooters do it all the time. Hence using powder drops.


Everyone knows at distance the SD matters.

Except the fact that people use that when it suits them. When their numbers aren’t small, the claim positive compensation.

When others numbers aren’t small, they claim it’s their SD that’s going wrong.


But no one ever seems to show up with data on long shot strings. Oddly enough.

This stuff would be incredibly easy to prove otherwise. Yet no one does it.
The biggest problem is long string large samples prove nothing other the generated heat changes point of impact its somthing we do when devloping loads and in my case . cartridges design and powder types in f class we look for the least amount of vertical on a 20 shot string. reason 20 shot timed venues. But when shooting elr 5 shot to 10 shot is what is needed. so large samples of shorter strings works for what is applicable. Long strings proves nothing other then the nature of the beast and proves nothing about what the rifle is capelable of in your venue. And believe me i dont show up at a match with rifle or load excuses when i can shoot 5 shot groups 10 times in a row and none of those groupes have higher sd then 4 fps then thats what it is for my needs. And thats not chance
 
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The biggest problem is long string large samples prove nothing other the generated heat changes point of impact its somthing we do when devloping loads and in my case . cartridges design and powder types in f class we look for the least amount of vertical on a 20 shot string. reason 20 shot timed venues. But when shooting elr 5 shot to 10 shot is what is needed. so large samples of shorter strings works for what is applicable. Long strings proves nothing other then the nature of the beast and proves nothing about what the rifle is capelable of in your venue. And believe me i dont show up at a match with rifle or load excuses

This is why David Tubb runs a chrono anytime he is allowed.

He understands that it’s almost impossible to get SD’s low enough to hit targets consistently once past certain yardage and/or target size.

So, when he misses high or low, he has data that tells him if it was the velocity that caused the miss. If it was the velocity, you don’t make a hold change on the next shot.

For example, you shoot a 10 shot 5sd string.

Your sd might be 5, but likely not. It’s going to be somewhere between:

3.4 and 9.1

Which means 95% of your shots could possibly have an ES of 36fps.

If you’re shooting at a distance/target combination that 36fps can miss, and you don’t have a chrono………

When you miss vertically, you can’t reliably decide if you need to adjust your elevation or hold, or just send another one with the same.



There are very, very, very few people who have actual and honest 5sd ammo.
 

badassgunworks

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This is why David Tubb runs a chrono anytime he is allowed.

He understands that it’s almost impossible to get SD’s low enough to hit targets consistently once past certain yardage and/or target size.

So, when he misses high or low, he has data that tells him if it was the velocity that caused the miss. If it was the velocity, you don’t make a hold change on the next shot.

For example, you shoot a 10 shot 5sd string.

Your sd might be 5, but likely not. It’s going to be somewhere between:

3.4 and 9.1

Which means 95% of your shots could possibly have an ES of 36fps.

If you’re shooting at a distance/target combination that 36fps can miss, and you don’t have a chrono………

When you miss vertically, you can’t reliably decide if you need to adjust your elevation or hold, or just send another one with the same.



There are very, very, very few people who have actual and honest 5sd ammo.
Yes there are many things that effect vertical inc wind . The last time i checked david has only won 1 elr match and most of the time he is in the middle if the score board.
I think Most of the matches allow a chronograph behind the fire line. We could talk about positive compensation even though david agrees with it. but we all know where that will go lol
 

kennyg

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I've ruined benchrest for more than one person. ;) Guy thinks he's in the .1's-.3's with a 15fps ES and a 20-30 shot set will show otherwise.

I have some handload data, 20 and 35 shot ladder tests with a couple of different cartridges. Somewhere in the .4-.6 MOA range is about as good as I've ever seen with SD's in the 5-7fps range being the best that are repeatable. The powder ladder is less important than the powder type.
Hey, I really appreciate you sharing data that you have spent a lot of time and money to obtain.

Maybe you have answered this somewhere else, but what do you mean by that last sentence? It seems like you are saying that choosing the correct powder can improve accuracy. If so, what process do you recommend for choosing the best powder?

Thanks!
 

Ledzep

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    Hey, I really appreciate you sharing data that you have spent a lot of time and money to obtain.

    Maybe you have answered this somewhere else, but what do you mean by that last sentence? It seems like you are saying that choosing the correct powder can improve accuracy. If so, what process do you recommend for choosing the best powder?

    Thanks!

    It's really barrel and cartridge dependent. Barrels have attitude (different barrels 'like' different things) and powders fit various cartridges better or worse, but in general if you're not getting the level of precision or ES/SD that you want, you're best off changing components. Bullets, even in the same weight class have different bearing surface lengths, ogive/bearing surface angles, etc.. and will produce different pressure vs. time curves that appear to affect accuracy differently.

    When you keep the bullets, cases, COAL, and primers the same and swap powders, the biggest change in dispersion I've noted is from swapping different powders. Next biggest is large changes (1gr+ at a time) in powder charge, the next most important thing has been seating depth-- some bullets that matters more/less than others.

    That all being said, powders that are popular for certain cartridges are typically popular for a reason. The Hodgdon extreme line has been consistently pretty solid-- Varget is awesome in most anything it makes sense for. The newer RL powders (16, 26) are pretty solid, and even the old ones (15, 17, 23 etc.) perform well but are less temp stable. I haven't messed with Vihtavuori at all, personally, so I can't speak for them but they're popular enough in certain circles they're probably worth looking into if you can find/afford them.
     
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    Ledzep

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    As far as realistic ES goes, 25-30fps is as good as it gets. If you think you're doing better than that I'd like to see it on a labradar over 20-30 shots. Respectable ES for PRS ranges (400-1400yd) is under 55-60fps with SD's under 12fps.

    For ELR MV spread as important if not more important than group size depending on how far you're shooting. The vertical spread from a large ES will out-run the circular dispersion of a 1 MOA load pretty quick if you're talking 1500-3500yd.
     
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    Taylorbok

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    As far as realistic ES goes, 25-30fps is as good as it gets. If you think you're doing better than that I'd like to see it on a labradar over 20-30 shots. Respectable ES for PRS ranges (400-1400yd) is under 55-60fps with SD's under 12fps.

    For ELR MV spread as important if not more important than group size depending on how far you're shooting. The vertical spread from a large ES will out-run the circular dispersion of a 1 MOA load pretty quick if you're talking 1500-3500yd.
    Throat in my rifle is pretty well effed now anyways and I have a bunch of ammo loaded so may as well give it a go. I'll post my findings when I have a chance to do the test.