Agree.... I would definitely change anything else other than the manufactures BC details..... There can be some errors introduced depending on how you measured scope height... Its quite a sensitive measurement influencing vertical drop. Measure aperture diameter, outside barrel diameter at scope aperture position, then measure the gap between bottom of aperture and top of the barrel.... Halve the 2 diameter measurements and those to the gap measurement.... Your 2" measure seems a but generalistic and that may well sort your issue along with a reassessment of the speed.... Take at least 5 shots and then the average, without any outliers....
Ballistic apps
- Thread starter Trigger260
- Start date
Is it possible to update my version due to sanctions???
Trigger260
Well-Known Member
I'm going to start over at the weekend. I'll take the stock off to get a precise measurement of scope height. I put the bc back to the claimed o.425 and had a play with the velocity settings, I needed to add 280fps to the mv to get the correct elevation measurement, and as I'm at a max powder charge that would be squeaky bum time.
Malxwal
Well-Known Member
Scope height, gas hole on side of action to centre line of scope. It doesn't have to be accurate to multiple decimal places, say 1.7"
To measure my glass over bore height i just measure from the centre of the rear of the bolt on my rem700 to the centre of the scope. Its close enough to work. I used to be a die hard strelok pro fan but I've since moved to AB and its much more accurate using their custom drag models over the usual G1 and G7 stuff
Foxyboy43
Well-Known Member
My pleasure….
PS
I bet there are a lot of elderly traditional glass types sniggering as they read this…
Malxwal
Well-Known Member
Sniggering, or just totally confused?My pleasure….
PS
I bet there are a lot of elderly traditional glass types sniggering as they read this…
Trigger260
Well-Known Member
I'm one of them, but at least I'm having a go!My pleasure….
PS
I bet there are a lot of elderly traditional glass types sniggering as they read this…
Trigger260
Well-Known Member
I just held my calipers up and spaced them to what looked like the two centers! I've played about with the scope height input on the app and I'd have to be well out to cause such a discrepancy at that range! I'm beginning to think i need to sort my bench and rifle bag situation. The more I mull it over after listening to everyone's advice, the more my finger starts pointing at me being sloppy!
Trigger260
Well-Known Member
I had a quick look at AB and it seemed over engineered for my purpose.
Read into that what you will
For those missing Strelok on their iPhones Chairgun Elite + is pretty much a carbon copy and works in the same way. Probably either code stolen from the previous developer or some sort of collaboration to get round the sanctions.
AM_Lillycombe
Well-Known Member
I can’t get on most Apps to work with high BC bullets.
So now I use Applied Ballistics then add a real world bullet drop in the Custom Drag Factor then it is perfect.
Oddly, same gun, same apps, everything was perfect with the old interlock bullets???
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Lots of times its the t*t behind the trigger.... It is in my case..... Decent adjustable rear bag and also another thought would be cheek weld.... If an option make sure the stock is adjusted. But saying that youre shooting groups...
Heym SR20
Well-Known Member
There is a very big difference between the results of any modelling software and what happens in real life. Most apps assume constant wind velocity at an angle to line of shot. They don’t account for wind swirling and changing direction or indeed having a vertical component.
Air pressure and temperature can also go through rapid changes. Next time you are out on a warm sunny day with little white puffy thermic clouds are forming. If there is a blue bit of sky above, look up and find a little whispy bit of cloud and watch that over 20 minutes. Also feel the air and watch the ground and air temperature. The ground warms due up to the sun, you get a warm bubble of air forming next to the ground. It starts to rise and as it rises it sucks in air all around and you get a column of warm rising air which then gets higher the water contained starts to condense forming clouds. As the cycle continues many little thermals are all drawn together forming a big column of rising air and the cloud build and builds into a big puffy towering cloud. If there is a lot of energy those clouds can tower forming thunder heads. On the ground you will gust fronts as air is dragged in. You will warm air rushing in towards the cloud.
As the warm air rises it forms a vaccuum with lower pressure. Heavy cold air from high up will then fall to takes it place and those warm gust fronts get replaced cold air gusts.
As the cloud overdevelops it shuts off the sun, stopping the development of the cloud, and the cloud starts to collapse with air flowing back to the ground. When this air hits the ground it spills out in all directions.
If you sit and watch you marked changes in temperature and wind direction. And you will see quite significant differences in pressure.
I have yet to see any app factor in all those constant changes in temperature, pressure and wind velocity and direction when doing its calcs.
Target shooters and professional snipers spend many many many hours on the range and the make very comprehensive notes. Over time the learn how to shoot and place their exactly where they want at long ranges.
Apps will get you in the ball park, skill developed over long periods of time will get you the medals.
Air pressure and temperature can also go through rapid changes. Next time you are out on a warm sunny day with little white puffy thermic clouds are forming. If there is a blue bit of sky above, look up and find a little whispy bit of cloud and watch that over 20 minutes. Also feel the air and watch the ground and air temperature. The ground warms due up to the sun, you get a warm bubble of air forming next to the ground. It starts to rise and as it rises it sucks in air all around and you get a column of warm rising air which then gets higher the water contained starts to condense forming clouds. As the cycle continues many little thermals are all drawn together forming a big column of rising air and the cloud build and builds into a big puffy towering cloud. If there is a lot of energy those clouds can tower forming thunder heads. On the ground you will gust fronts as air is dragged in. You will warm air rushing in towards the cloud.
As the warm air rises it forms a vaccuum with lower pressure. Heavy cold air from high up will then fall to takes it place and those warm gust fronts get replaced cold air gusts.
As the cloud overdevelops it shuts off the sun, stopping the development of the cloud, and the cloud starts to collapse with air flowing back to the ground. When this air hits the ground it spills out in all directions.
If you sit and watch you marked changes in temperature and wind direction. And you will see quite significant differences in pressure.
I have yet to see any app factor in all those constant changes in temperature, pressure and wind velocity and direction when doing its calcs.
Target shooters and professional snipers spend many many many hours on the range and the make very comprehensive notes. Over time the learn how to shoot and place their exactly where they want at long ranges.
Apps will get you in the ball park, skill developed over long periods of time will get you the medals.
Trigger260
Well-Known Member
Yeah my portable bench isn't the most rigid and I didn't remove the pic rail from the forend, Beginning to think the muzzle might have been jumping a little.
I'll get back out this weekend and see if I can improve things.
Thanks
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