Ballistic Ratio

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2019 Arizona State Palma Champion
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High-power Rifle
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How can I figure out the correct setting is for my discipline? I’m shooting a 1000yd target with 155gr bullets at 3100ft/sec.
 

Peter

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How can I figure out the correct setting is for my discipline? I’m shooting a 1000yd target with 155gr bullets at 3100ft/sec.
Ballistic Ratio's value varies from gun to gun and depends on a bunch of factors (gun's barrel, ammo quality, bullet speed, etc.)
Hence, you can't simply copy-paste the ratio of your shooter peers at the range.

That's why in order to find your personalized Ballistic Ratio, we highly recommend shooting a group of 10 (at least, but the more - the better) live shots with SCATT and comparing both groups (real shot-holes vs. what SCATT displays). When this is done feel free to start adjusting the Ratio back and forth in the settings until both groups look almost identical. After the optimal value for the gun and particular exercise is established - it would be a good idea to write it down in case you happen to switch laptops (so you won't have to go through this calibration again).

Also, you don't really have to bring your SCATT and laptop to the range with you (although that would be ideal), since every shooter is more or less consistent from series to series. Thus, you can simply take the cards with you after you are done shooting live rounds for the day and adjust your coefficient in the comfort of your home. Here is another little tip in case you've been fidgeting with coefficient values and now would like to go back to default settings, yet forgot what it was set to initially: just create a new user and start an event - this shall effectively reset the settings in regards to your Ballistic Ratio.

It's crucial to understand that the shot holes will most likely not match 100%, as any SCATT model is a training tool first and foremost and should not be used as a substitute for an electronic scoring system. Generally speaking, SCATT is really good at predicting where the bullet should go, but it can't take into account that say, bullet number 8 is going to be flawed and won't go where a perfectly-manufactured bullet should go.

In a nutshell, even if the Ballistic Ratio you arrive at doesn't yield identical shot holes - it's OK and you shouldn't get discouraged, for it would be a good idea to analyze the shots that don't quite match the real shot-holes. This discrepancy may be in fact indicating that you have too much trigger-jerk during the last 250 milliseconds of the shot. So your hand flinches and gives the bullet enough sideways momentum that it flyes and curves away from the software-predicted trajectory. In this case, I'd highly recommend taking a closer look at how you are operating the gun in regards to those particular shots (S1 vs. S2 dynamic in the stat-table).
 
OP
C
Your highest shooting achievement
2019 Arizona State Palma Champion
Skill Level
Professional
Primary Discipline
High-power Rifle
SCATT Experience
Less than 1 year
Joined
Mar 17, 2020
2 Posts
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Thank you.
 
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GB Team
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Amateur/Hobby Shooter
Primary Discipline
High-power Rifle
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Over 10 years
Joined
Mar 10, 2020
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Ballistic Ratio's value varies from gun to gun and depends on a bunch of factors (gun's barrel, ammo quality, bullet speed, etc.)
Hence, you can't simply copy-paste the ratio of your shooter peers at the range.

That's why in order to find your personalized Ballistic Ratio, we highly recommend shooting a group of 10 (at least, but the more - the better) live shots with SCATT and comparing both groups (real shot-holes vs. what SCATT displays). When this is done feel free to start adjusting the Ratio back and forth in the settings until both groups look almost identical. After the optimal value for the gun and particular exercise is established - it would be a good idea to write it down in case you happen to switch laptops (so you won't have to go through this calibration again).
CurtB - This is certainly the way to go to determine the best Ballistic Ratio (F Coefficient for those of us with older Scatt systems). However, it depends on two things: You need a live fire Scatt system (MX--) and you need to be shooting in an environment where wind has minimal effect (indoors or at short range). Fullbore shooters in Commonwealth countries generally shoot at distances of 300-1000 yds (300-900m). US High-Power shooters spend most of their time at 1000 yds. This Ballistic Ratio test might work at 300 yds/m on a relatively calm day, but you will need a very calm day to do a comparison at any longer distance.
Furthermore, friends who have tried live fire Scatt at fullbore targets have generally been unsuccessful in getting the sensor to recognise the target. This may be due to the relatively small area of white surrounding the aiming mark (the background beyond the edges of the target is usually a brown sand stop-butt) and/or the proximity of adjacent targets on the range (we rarely get the opportunity to shoot with just one target displayed). If the Scatt sensor had a narrower field of view it might help it to recognise the target. At 1000 yds the aiming mark is 44" (4.2 MOA) on a 72" (6.9 MOA) square white target (US dimensions - UK & Canada use a 48" (4.6 MOA) diameter aiming mark on a target that is the same height but slightly wider - 96" in Canada and 120" in the UK). As you can see, it needs a very narrow field of view sensor to recognise this as a target, hence the problem, even if you have a live fire Scatt (which most fullbore shooters in the UK don't - we bought ours before the MX versions became available).
In the absence of an ability to determine a more appropriate Ballistic Ratio value, we use 40, which seems to give about the right results. However, as Scatt is mainly used as a training aid, the precise value is of limited importance, provided we stick to the same value for all our sessions (to enable performance over time to be monitored). Furthermore, as we mostly use similar ammunition (7.62mm/.308" and 155 grain bullets) in similar rifles, if we all use the same Ballistic Ratio (F Coefficient), then we can compare our Scatt results directly with each other.
 
Your highest shooting achievement
600p
Skill Level
Amateur/Hobby Shooter
Primary Discipline
Small-bore Rifle
SCATT Experience
Over 10 years
Joined
Apr 5, 2020
3 Posts
1 Helpful Votes
0 Best Q&A Answers
Ballistic Ratio's value varies from gun to gun and depends on a bunch of factors (gun's barrel, ammo quality, bullet speed, etc.)
Hence, you can't simply copy-paste the ratio of your shooter peers at the range.

That's why in order to find your personalized Ballistic Ratio, we highly recommend shooting a group of 10 (at least, but the more - the better) live shots with SCATT and comparing both groups (real shot-holes vs. what SCATT displays). When this is done feel free to start adjusting the Ratio back and forth in the settings until both groups look almost identical. After the optimal value for the gun and particular exercise is established - it would be a good idea to write it down in case you happen to switch laptops (so you won't have to go through this calibration again).

Also, you don't really have to bring your SCATT and laptop to the range with you (although that would be ideal), since every shooter is more or less consistent from series to series. Thus, you can simply take the cards with you after you are done shooting live rounds for the day and adjust your coefficient in the comfort of your home. Here is another little tip in case you've been fidgeting with coefficient values and now would like to go back to default settings, yet forgot what it was set to initially: just create a new user and start an event - this shall effectively reset the settings in regards to your Ballistic Ratio.

It's crucial to understand that the shot holes will most likely not match 100%, as any SCATT model is a training tool first and foremost and should not be used as a substitute for an electronic scoring system. Generally speaking, SCATT is really good at predicting where the bullet should go, but it can't take into account that say, bullet number 8 is going to be flawed and won't go where a perfectly-manufactured bullet should go.

In a nutshell, even if the Ballistic Ratio you arrive at doesn't yield identical shot holes - it's OK and you shouldn't get discouraged, for it would be a good idea to analyze the shots that don't quite match the real shot-holes. This discrepancy may be in fact indicating that you have too much trigger-jerk during the last 250 milliseconds of the shot. So your hand flinches and gives the bullet enough sideways momentum that it flyes and curves away from the software-predicted trajectory. In this case, I'd highly recommend taking a closer look at how you are operating the gun in regards to those particular shots (S1 vs. S2 dynamic in the stat-table).
Hello!
Can you tell if the F- Cofficient shall be at same level when shooting sharp on scatt and if dry firing ( click) on scatt? And in case what is normal here on 10m and 50m? Thank you!
 

Peter

Administrator
Skill Level
Amateur/Hobby Shooter
Joined
Sep 9, 2019
287 Posts
190 Helpful Votes
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Hello!
Can you tell if the F- Cofficient shall be at same level when shooting sharp on scatt and if dry firing ( click) on scatt? And in case what is normal here on 10m and 50m? Thank you!
You basically go through a live fire session in order to determine your personal F with that gun and then apply it to your dry-fire training as well as to all live-fire sessions that follow. So it should be the same

The defaults (a.k.a. what's normal) are already set for all disciplines in the software
 
Your highest shooting achievement
600p
Skill Level
Amateur/Hobby Shooter
Primary Discipline
Small-bore Rifle
SCATT Experience
Over 10 years
Joined
Apr 5, 2020
3 Posts
1 Helpful Votes
0 Best Q&A Answers
You basically go through a live fire session in order to determine your personal F with that gun and then apply it to your dry-fire training as well as to all live-fire sessions that follow. So it should be the same

The defaults (a.k.a. what's normal) are already set for all disciplines in the software
Thank! How can you determine your spes F? You mean if monitor ( live fire) and scatt pc show about same groups?
 

Peter

Administrator
Skill Level
Amateur/Hobby Shooter
Joined
Sep 9, 2019
287 Posts
190 Helpful Votes
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Thank! How can you determine your spes F? You mean if monitor ( live fire) and scatt pc show about same groups?
Yes, the whole guide is there if you scroll a couple of messages up. "We highly recommend shooting a group of 10 (at least, but the more - the better) live shots with SCATT and comparing both groups (real shot-holes vs. what SCATT displays). When this is done feel free to start adjusting the Ratio back and forth in the settings until both groups look almost identical." So when the groups are almost identical you take that coefficient, let's say 41, and use it onward with that gun in that particular discipline (be it dry or live fire alike).

If you switch to another gun or another target/distance, this coefficient won't apply there - you'll need to go through the process again
 
Your highest shooting achievement
Gpp 300 2019
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Small-bore Rifle
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Hello Peter
Do you know the value of the ballistic ratio in the Scatt Basic ?
Thx
 

Peter

Administrator
Skill Level
Amateur/Hobby Shooter
Joined
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287 Posts
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Do you know the value of the ballistic ratio in the Scatt Basic ?
My apologies for a delayed reply, this thread hasn't notified me of a new post for some reason
SCATT Basic has no F/Ballistic Ratio feature whatsoever so it's effectively set to 0
Therefore, you get absolutely no bullet drop/group dispersion. In other words, your shot-holes are exactly where you pulled the trigger.
 
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