Could a group here take over Chairgun from Hawke?

[aceflier]

GL and GS is now in IOS so a .457 lyman 330gr mold #457122 would be what drag model? Lol  Ive been using G1 and it’s been pretty close with a 50yd zero at 105yds.

[Kinetic45^]

I would try GL as that is for 'blunt' projectiles and covers round nose rifle and the heavier pistol bullets

GS is for round ball (which is a high drag projectile)

G1 is the flat based artillery shell spitzer so it has less drag than GL

And G7 is the boat tail VeryLowDrag form

GC is wadcutter/cylinder

RA4 is the 22 Long Rifle bullet which also is close to GL

Don't have the SWC drag form, you just have to pick which is closer to the bullets profile GL or GC and adjust as necessary.

[PSI-lbc]

Yes, I'd agree that the handheld versions probably won't need graphs.

🔶 However, what is missing sorely in both mobile ChairGun and Strelok is pellet BC calculation based on two chrono velocities.



🔶 Another function I need in the field — and therefore on a mobile is when I'm shooting up at an angle and have a couple of buildings further down range from the target.

I need to know the terminal range at angle A of gun—pellet combo B.
That way I know how shallow or steep my angle needs to be in order to avoid the houses.

Now ChairGun for PC (but not mobile) does this marvellously, cf. this thread with pics:
https://www.gatewaytoairguns.org/GTA/index.php?topic=147260

Those features both seem like reasonable asks. 

[Kinetic45^]

Yes, I'd agree that the handheld versions probably won't need graphs.

🔶 However, what is missing sorely in both mobile ChairGun and Strelok is pellet BC calculation based on two chrono velocities.



🔶 Another function I need in the field — and therefore on a mobile is when I'm shooting up at an angle and have a couple of buildings further down range from the target.

I need to know the terminal range at angle A of gun—pellet combo B.
That way I know how shallow or steep my angle needs to be in order to avoid the houses.

Now ChairGun for PC (but not mobile) does this marvellously, cf. this thread with pics:
https://www.gatewaytoairguns.org/GTA/index.php?topic=147260

Those features both seem like reasonable asks.

I wonder if we should discuss with Igor/Strelok having a 'Strelok AIR' version???
He might not want to load up the Pro version with too much of our specialty stuff.

[rsterne]

Excellent idea.... Pellets and some of the commonly used cast bullets, and add more as the need grows....

Bob

[plinker81366]

actually strelok has database for pellets,, to get precise trajectory data, use the g1 drag, and get the TV trajectory validation, the farther the better,, and use velocity instead of BC..we been doing that here 4-5yrs now,,anyway it makes you feel good hitting baloon size targets at 200yds with a 22 on your first shot,, and that is not having any dope or data of previous engagement

[Kinetic45^]

As a big bore shooter, I will never get long shot strings and as a hunter all I need is good numbers for a couple of shots.

I can envision a page that has, say a pre entered five shots string and you would tap on the shot you wanted and it would have your sighting data for that shots probable FPS.
Ex:
Shot 1: FPS = 868 {tap on this and it would give trajectory for this FPS}
Shot 2: FPS = 847 {next shot tap this line and get new setup}
Shot 3: FPS = 827
Shot 4: FPS = 806
Shot 5: FPS = 780

As you can see by this example, the trajectories would be fairly different and if I was sighted in for #1 then I would be way off for #5.  With a page that I could enter the average shot string from testing I could just select the the one I needed based on where I was in the actual shot string.

Or, it could be done by gauge pressure, if you saw your pressure you could select that and it would give you trajectory based on prior chrony and target info.  A field adjustable dope sheet so to speak.

This is very close to how I use Chairgun except what I do is keep the app open before me, and have my shot string FPSs written down on a strip of paper. So if I was on shot four I quickly change the FPS box on Chairguns front page, tap on the enter symbol then hit recticle box at bottom and I got my new sight picture and I'm ready to go/shoot. Note we are talking longer ranges here, more than 100 yards.
This works really well with mrad/mildot.

You CAN do this shot to shot recalculation with Strelok but it takes a lot longer and more taps and screen changes in and out.  Awkward and unweldy in the field.

[plinker81366]

Excellent idea.... Pellets and some of the commonly used cast bullets, and add more as the need grows....

Bob

hi bob, i think you already found this link,, but if not

http://www.borisov.mobi/strelokpro/android/configuration.html

[ToRmEnToR]

Great work guys

[Gerard]

hi bob, i think you already found this link,, but if not

http://www.borisov.mobi/strelokpro/android/configuration.html

And this more wordy user manual page might also be helpful:
http://www.borisov.mobi/strelokplus/manual.html

[Nvreloader]

Thanks Guys

For adding the Strelokpro info,
I have been fighting on how to use this ballistic program since, since I bought it several years ago,
on my I pad with limited results........

Now I'll go back and read this info, to use it right. LOL

Thanks for the info, Plinker and Gerard.

Question for you all,
Where do you find these ballistic programs for IPad and the Android operating systems,
I have been searching the Apple store selections with NO results etc.

I have a lap top type computer that has several ballistic programs and Quickload program in them,
that I take to the range/field for double checking the info etc.

I would like to have all these programs on both the IPad and lap top etc, as a back up,
as the Ipad is easy to take and use in the field.......

Since I have just started using air rifles, I would like to add air rifle info to both computers also.

Thanks,
Don

[Gerard]

Not quite on topic, but I'm wondering if anyone has any idea how one might increase the scope view field for a Burris 'ballisticplex' reticle such as this:



There's a little dot at about 6.5x on the Burris Droptine 2-7x scope I'm using on my QB78D in .22", which seems likely to indicate the range to which it's been calibrated. Shooting JSB 18.13gr at 700fps. I was hoping to head out sometime when the weather's a bit nice and trying my hand at the GTA 'nothing under 100 yards' thing - 91.44 metres, which Strelok is showing rounded down to 91 metres. From reading the developer's FAQ page it seems he sort of answers this when someone's asking about introducing a simple duplex reticle - he says that since there are no dots nor lines in a duplex reticle there's no point. And I guess I agree... and can see how this sort of thinking could extend to the un-graduated part of the lower reticle element with the Burris reticle I'm using. But it would be really nice to be able to see the relative position of an 8.5" x 11" piece of paper at 7x zoom. At 4x the top edge of the paper looks like it's almost an inch below the point of the thick bar. And that's cool, it may be usable in the field... but 100 yards is longer than I've shot before, and I'd prefer to use 7x if possible.

Unfortunately Chairgun doesn't include this Burris reticle, though it has a couple which are sort of in the ballpark. If there were a way to draw a reticle and import it into Chairgun that'd be ideal. I use range cards (graphs with numeric values inserted in a box and other notes) for all my airguns, printed from screenshots (higher quality than exporting using Chairgun's menus). So I know approximately how high to holdover for this new distance and can make a simple extension above the target paper at the required height as a point of aim. But I'd rather be looking at the target when shooting, not a secondary target above it. Seems unlikely to get that with either Chairgun or Strelok unless I buy a different scope... and I really like the Burris as it suits my generally shorter shooting distances nicely, besides having lovely clear glass and being very lightweight.

[rsterne]

OK, I have played with Strelok Pro, and I can't find any pellets, nor a way to input pellets or bullets that are not in the database already.... Surely there must be a way to create file for these which have at least a single BC and use the GA profile and save that info so that if you want to use the same pellet/bullet in a different rifle, you don't have to type everything in again?.... For instance, create a .22 cal JSB 181 gr. Heavy as a "bullet" and add it to the database?.... or a Lee 336 gr. FN cast bullet?.... Same thing with a rifle, if you want to use several different bullets or pressures, there must be some way to duplicate what data doesn't change, and just change what you want?....

Bob

[plinker81366]

OK, I have played with Strelok Pro, and I can't find any pellets, nor a way to input pellets or bullets that are not in the database already.... Surely there must be a way to create file for these which have at least a single BC and use the GA profile and save that info so that if you want to use the same pellet/bullet in a different rifle, you don't have to type everything in again?.... For instance, create a .22 cal JSB 181 gr. Heavy as a "bullet" and add it to the database?.... or a Lee 336 gr. FN cast bullet?.... Same thing with a rifle, if you want to use several different bullets or pressures, there must be some way to duplicate what data doesn't change, and just change what you want?....

Bob

save data and change rifle bob, have you tried that?

[rsterne]

From what I can see, you have to enter all the data each time you change anything.... and no way to save bullets c/w their BC, weight, etc.etc….  …. I couldn't even find a way to copy a "rifle" so that you could save several pellets / pressures / velocities....

I'm pretty sure this can't be right, surely nobody would rave about such a program?....

Bob

[plinker81366]

bob this is saved data from my rifle,

[plinker81366]

this is my saved data from other rifles, sample data are different rifles i have diddnt edit the rifle name,, 177is i think my br rig

[plinker81366]

data replaced and switched to 177 br rifle,, wanted to see if i can shoot at 100-120yds with 177..not yet finished though and have not validated it

[plinker81366]

and with strelok, you actually dont need a chronograph to get the trajectory, bullet /pellet drop, hold hold over and under etc,,, just validate it and your good

[rsterne]

eumel…. What I need to know is how to store the pellet data (weight, BC, drag model, length, etc.) so that when I want to use that same pellet again I don't have to re-enter everything.... Same for a rifle, how do I store the name, caliber, pressure information etc. so that I can recall it, perhaps change the pressure, and have a new dataset.... then just pick my pellet from a list of the ones I have input (better yet, already in Strelok) and it loads all the data for it, like ChairGun does from their pellet database.... Ideally, "rifle" should include your scope setup, "cartridge" should include the caliber, pressure and velocity, and "bullet" should have all the pertinent data on that....

If this is not available in Strelok, why not?.... and why is everyone raving about how good it is, better than ChairGun?.... Do you all have only one rifle and shoot one pellet?....

Perhaps I'm wrong, and these very basic features are in Strelok and I just can't find them.... and nobody has yet told me how to do them.... If they are not there, then we need to contact Igor and send him all the data so that he can add a pellet database, and a cast bullet database for the Big Bore guys.... Even if he does that, however, we still need a way to create additional pellets/slugs/bullets in a database that Strelok can access and input all the pertinent information with one touch of the screen.... JMHO....

Perhaps a link to the HAM pellet BC page would be a place for him to start?.... https://hardairmagazine.com/ballistic-coefficients/

Bob