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Posted: 7/30/2023 4:28:06 PM EDT
How many rounds do you shoot from a given lot/batch of ammo to determine the average velocity for the lot/batch?
Today was my first time using a chronograph. I shot 5 rounds each from 2 different lots. One lot average about 20fps faster than the other. In your experience, is that enough to get a good average velocity for purposes of calculating how much to dial? |
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Posted: 7/30/2023 4:38:27 PM EDT
[#1]
5 rounds will give you an idea but I like to do around 10 rounds to get a decent idea of velocity for my ballistic program and ES/SD. I have my Magnetospeed on a mount so I can just leave it on when shooting if I like but if testing I load up 5 and then find what looks good and then load up more. For factory ammo I'd just shoot 10 rounds and use that. Different lots of factory ammo will give different velocities. I am sure you will get people in here that will tell you to shoot 50 or 100 rounds but never saw that need.
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Posted: 7/30/2023 7:13:18 PM EDT
[Last Edit: 50-140]
[#2]
First go around when I'm still developing a load five rounds, once I'm getting close to an ideal load and am going to use fps in a ballistic program I do ten rounds.
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Posted: 7/30/2023 8:03:02 PM EDT
[#3]
Quote HistoryOriginally Posted By 50-140: First go around when I'm still developing a load five rounds, once I'm getting close to an ideal load and am going to use fps in a ballistic program I do ten rounds. |
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Posted: 7/31/2023 5:29:42 PM EDT
[#4]
Depends on what is being shot.
When I shoot metallic cartridges, 5 minimum and prefer 10. When I shoot a muzzle loader or my buddy is shooting his smokeless muzzle loader (yeah, you read that right) it is 3 or 5 rounds. |
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Posted: 7/31/2023 5:50:29 PM EDT
[#5]
I use a Lab Radar. Factory Hornady Match 6MM Creed 108 eld ( all the same lot). Five shot average allows me to shoot five inch groups at 1000. Good enough for a 70 year old.
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Posted: 7/31/2023 8:44:06 PM EDT
[#6]
Thanks for the replies.
I am going to try 10 rds next time but I think I am okay with the 5 rd sample for now. I have a "long range" shooting class coming up. It is part of the process to certification for use of my club's 600 yard range. I know that is really medium range but it is still twice as far as I have ever shot. |
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Posted: 10/31/2023 3:02:09 AM EDT
[#7]
Unless you're looking for Xs, five rounds will be good enough for 600.
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Posted: 10/31/2023 9:14:22 AM EDT
[#8]
I agree ten rounds is sufficient. But I do five rounds at three different temperatures usually 85,60 and around 35 degrees. That way I don’t have any powder sensitive surprises. It has taught me that certain powders can be temperature sensitive especially ball powder.
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FL, USA
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Posted: 12/5/2023 7:38:17 PM EDT
[#9]
Ten rounds is what I use.
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