Hey everyone hope everyone is doing good. My question is how do you find out how fast of a rifle you have? Been listening to the everyday sniper podcast and everything and you keep hearing them say I got a 5mph gun or a 7mph gun here. How do you determine that factor. Thank you all for any info and advice.
Rifle speed
- Thread starter ShaunRyan80
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@Lowlight has put up a how to video in the online training section, so if you pay you can access that. Also it is explained in the podcast as you mentioned. To sum it up you are using a ballistic app (the Hornady 4DOF in the podcast) and seeing at 500 yards with a wind from either 9 or 3 o'clock and adjusting the MPH of the wind until it equals .5 mils at 500 yards. This gives you your MPH number for that rifle. Usually it translates fairly well to the first number of your G1 BC for your bullet.
I have a savage BA10 stealth and currently have hornady 147gr eld match ammo
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A couple things here. Hornady lists the BC for the 6.5 147gr ELD Match as .697 so you are probably a 6. Unless you are pushing this bullet really fast or something that would boost your BC, this would be about where you are. If you are running a 6.5 Creedmoor you are possibly a 5. You really need to get all of your information in your ballistic calculator and more importantly - verified by real world results. Just entering in the data in 4DOF assuming you are shooting the 6.5CM it comes out as a 5 or a 6. Also understand that this is just a rough estimate for making wind calls in a short amount of time. It will work but is not going to be dead nuts
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I understand that I was playing with the app I have and was just trying to understand it a little better.
Not 100% sure on the elevation I'm in sw Georgia. I was just trying to under stand it a little better while play with the BBC app I downloaded. And I am using a 6.5 creedmor.
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You are probably very close to sea level where you are.
So basically, if you are running this bullet at 2,600 fps your gun is a 5.5 mph gun, so you would need to decide which way you are gonna fudge if you are going to use whole numbers. If you run it at 2,700 fps or a little better then it is a 6 mph gun.
Hope this helps.
So basically, if you are running this bullet at 2,600 fps your gun is a 5.5 mph gun, so you would need to decide which way you are gonna fudge if you are going to use whole numbers. If you run it at 2,700 fps or a little better then it is a 6 mph gun.
Hope this helps.
A lot of the idea behind this is that you already have a good base knowledge of your ballistics program and how to make sure it is set correctly.
If you know that your solver is set correctly, it is simple to just adjust the wind speed up and down with CE and AJ turned off until the numbers lineup. I would say focus on the distance that are going to be shot the most, because the curve doesn’t line up indefinitely.
Thank you that helps understand it more. Like I said in the beginning I'm new to precision rifle shooting so this is all new to me. All the insight is much appreciated.
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Like @Diver160651 said above, just put your inputs in correctly and play with it a bit. He likes to line it up at 800 yards and add a bit for farther distances. I prefer to line it up at 1000 yards and accept the small variances at the closer distances where they matter much less.
Having said all that, this is not a precise calculation. This a down and dirty fast figure. In your case, you are basically deciding whether you want to use 5mph or 6mph.
For clarity.
The reason I like to have let’s say 300-600 dead on, is it is a bit easier to guess the wind and there are more actual targets in PRS/NRL in that range. When I make mistakes at that range, the actual wind value and correction input is easier to reverse engineer.
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