Trajectory Validation Without Chronograph
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- Опубликовано: 19 сен 2024
- A tutorial video on how to do a trajectory validation without chronograph. A handful of you asked for this specifically. Watch till the end for ballistics program. This is just the method I use. There are several out there. Enjoy!
It takes a lot of hours and a little skill to create this content. Please consider supporting me through Patreon so I can afford to continue making videos. Thanks! / prn
Wow, this is the first precision shooter that I have seen on RUclips that does things right behind the gun. His face dies not come off the stock after every round, good bolt manipulation and good shooting position behind the rifle. Good job dude.
Thank you!
Great job. Great information presentation. Last year, while on a range in Immokolee, FL, I received some training and the instructor used the Ballistic AE app for iPhone. We students zeroed at 100, then shot 200, 300, 400, & 500 yards while holding the same point of aim. Just as you did, we measured the vertical drop at each distance, entered each range/drop point and pressed “trajectory” which validated velocity and built a perfect algorithm for the ballistic curve. Perfect data. For an advanced step, in the environmental, stating with 29.92 simulation sea level, you can enter 29.82 for 1000 feet mean sea level and recalculate data, enter 29.72 for 2,000 msl and so on for as high as you want to go and you can fabricate perfect paper charts for when the batteries die in your Kestral. 🛩
You do not need a huge piece of cardboard. When shooting at the far distance, dial your scope a known amount (guesstimate a number that gets you close, ex. 1.5 MIL @ 300m) to still be on the board. Then do the calculation just as you did here.
He was working at 600 yards, so dial up 0.5mil and drop your group 10.8 inch.
thanks for the info!! always great to learn these methods and not place complete reliance on equipment such as cronos, range finders etc. knowledge doesn't run out of batteries!
You bet!
Excellent video. Thanks for taking the time to film and edit it and of course for positing it for our benefit. Keep up the good work! -Migs
Thank You very good info as I'm trying to wrap my head around all of this.
Love the Federal 130 Bergers! I shot them all last year and most of this year
Anyone who gets into ballistic testing should step number one first go to the nearest university and take about three masters level statistics courses in the fundamental design of experiments, sampling methods, and regression analysis.
Oof no thanks. Hard pass for me. Guess I’ll just be sub par.
Great technique, but it’s easier for me to find a chrono than a 600 yrd range.
Exactly
24" is not exactly 6 MOA at 400 yards. 6 MOA would be just over 25" using true minute of angle. While not a huge difference there is a bit and would be magnified at distance.
you are correct. I was using shooter's moa instead of true moa. Again, the purpose of this is just to teach one simple method of trajectory validation. Wasn't exactly a detailed science experiment. lol Thanks for the feedback!
Great vid. Nice work.
Thank you sir. I appreciate that!
So I see people doing the validation the same way u did in this viedo I also see people doing it by getting a drop chart and shooting two far targets (600) and (900) according to what the chart says to correct for those distances then measuring there group high or low and putting into a ballistic calculator for trajectory validation my question is is one way more accurate then the other or do they both come up with the same result with 2 different ways of getting there all this info is very much appreciated thanks I use this same calculator.
Seth Ortiz The 600 and 900 yard method tends to give you a better picture of your particular drag curve, but I do think you can get to the same result with either method.
Obviously the more distances/points that you measure from gives you a better overall picture of what your bullet is doing throughout the entire arc of travel.
So, I'm guessing that if you had chrono for FPS, you could calculate a bullet's BC? I've got some cast lead, but no idea of the BC.
couldn't you have just marked a spot 4 inches above the zero mark and dialed until you hit the spot? got the MOA call and use any ballistic program to match the hold?
Sounds like that could work, but I'm not certain. I have only tried the one way you see in the video. Thanks for the idea!
Precision Rifle Network Because where are you getting your BC from? Probably the box and the box cheats on their BC just like that cheat on their velocity. They know that people buy their ammunition based on the velocity and the BC so they cheat on both those numbers.
What range should i use to do this with a sub 12flb air rifle ? My normal zero is at 35 yards
sorry, but honestly, I have no idea. I'm not an air gun guy and I've never tried this method with anything other than a precision centerfire rifle. Thanks for watching.
Forgive me for a stupid question, but if I do have a chrono, can I use this same process to validate the listed BC of a given bullet?
David Marlow not sure about bc specifically but definitely to validate the chrono numbers just to make sure everything is lining up.
you'll have to factor in elevation for sure
David Marlow yes. If you're using a magnetospeed or better yet, Labradar to give you a truly accurate velocity. Plug that number in along with all environmentals and shoot several distances such as 600, 1000, 1300. If you can get out that far, you'll know exactly what you're dealing with. Remember, b/c degrades over distance too
Wow ty bro great video ty
Does this ballistic app come on a mobile android device ?
No I don't think so.
So i see all these ballistics vids... that I don't understand at all... can I just shoot a zero at 100... 150... 200... 250... and so on... and record all my elevation points at these distances... to be accurate ???
You certainly can. That's a fair bit of extra work, but if you enjoy doing it... who cares right? Any ballistics questions I can help answer?
@@PrecisionRifleNetwork Thanks for that I appreciate it.. us novices want to see a video on how to set up a gun and start from scratch on how it's done... in very simple steps ... scope height.. zero distances and ballistics for what ever caliber.. how is it done ?
@@dannywarren1549 good idea. I'll try to make that happen.
Should have shot it through a chronograph and did a comparison for accuracy of numbers.
Cecil Andrews you don’t trust my math? lol
...probably wise 🤷🏻♂️
It was just a thought. I enjoyed the video. I love math and figuring out solutions.
Cecil Andrews dude, don’t watch any more of my videos where I try to do math. You won’t be happy. lol I truly suck at it.
@@PrecisionRifleNetwork So MV is only half the equation: how do you true the BC now that you've found an MV that you're happy with?
@@wilfdarr BC truing can be figured out with an equation. (I suck at math and equations) You need the velocity at the muzzle and then the velocity at 100y. You can get both of those values from the method in this video. Plug that into the equation and you'll have a BC number. It could be further trued by using a secondary distance further than 100y. I'm sure you could google that equation if you're interested.
Mightn't it have been best to follow up the validation of the MV with a chronograph measurement of the MV? There would be merit in doing so if the compared MVs were identical, similar or dissimilar and, in particular, how similar or dissimilar.
Sir, the entire point of this video is to get the muzzle velocity without using a chronograph. Thanks for your feedback.
@@fasteddie9502 As one with a graduate level of formal education in statistics and the design of experiments, plus a long career of professional application of same, I totally agree. No model that has not been verified with testing should be depended upon.
Do you have another way to do a validation like this? Tell me how.
Precision Rifle Network. Watch the gunwerks trajectory validation video. He does it with guessing muzzle velocity. That would have solved the cardboard issue at 600 yards.
Do you have a video on truing your BC?
Arick Souvanna No. sorry. I’ll consider doing one though.
Will this method be as accurate if you Zero at 50 and measure the bullet trajectory at 100 yards?
It wouldn't be quite as accurate because you want the difference to be significant for you to measure. the difference between 50 and 100 yards would not even be a half inch for most modern calibers.
I was wondering the same thing. I shoot a 30-30. I'd need to stack refrigerator boxes at 600 yards to stay on the cardboard. 😂
@@kf4293 you could dial up your scope an easy number close the the expected drop. suppose the expected drop was 82 inches. thats 13 MOA at 600yds. so dial your scope 12 MOA and measure the extra amount.
@@RangerCaptain11A Thanks buddy! True story... I dialed up the scope while shooting cast lead at about 1000fps.... and forgot to dial it back down before we went hunting. It wasn't until later that I figured out why the heck I missed this buck that I had my crosshairs right on at about 80 yards this year. Bullet went right over the top of him!
@@davidcoiner6550 Depends on HOB of scope.
what rifle is that?
Oso 11 custom build. Defiance action, masterpiece arms chassis, vortex razor hd gen2 scope, Atlas bipod. 6.5 Creedmoor.
Too bad the discussion was so difficult to hear and follow due to the loud, annoying background noise.
Yeah too bad
When I stopped the video, I realised how awful that fucking pointless music was.