dcliff

Anyone know of the nearest place / person / range / shop to York who can chrono a firearm...? Short of buying a chrono myself I'm stumped.. :-/ Thanks DC

Thanks :-) I suppose the best thing to do would be to ask people why this is a BAD idea... In fact, I'll do that. PEOPLE: Tell me why this is a bad idea? FYI: This app doesn't do wind. Just trajectory. It's not intended to be a field aid for that 1000yd bunny. Just a quick and easy to use reference point.

Ahh OK - good point. I know that can happen and can filter it out! This stage isn't crucial to development... merely intriguing.

Oh, and I forgot to touch on these bit... You do not enter a temperature figure in this app And to the guy who thinks their trajectory is flat: Any calculator shows that.. it isn't - not just mine!

I can see how you might think it's useless data. Realistically it's very useful and not an enormous volume of data - so far I've had one response containing three figures! 10 more of them and I'm happy.. that's not huge volumes and very easy for me to process. Also, you have to understand, I'm not calibrating the app with these figures, I'm just checking to see if our mathematical formula works in the real world. I've checked it with my guns and so for all is correct. We're only using muzzle velocity and zero range remember, and approximating everything else as it's negligible. Because of this, I'd really like to see if that throws any problems. As I've already mentioned, the SIMPLE part of this is the user experience - that is, how it looks and how you use it. There are countless calculators out there, correct. Mine offers different and more simple operation WHILE ALSO being mathematically accurate. I suppose if you get chance to download it you'd understand. It's not a table or chart. It's not a re-skined Hawke BRC device. It's a slider, crosshairs and output figure. I wasn't going to do this - as it's in development mode and requires tweaking, but this is what it looks like, currently: http://cloud.cliffdesign.co.uk/Ugyv Still, this is great feedback. If the shooting community (you guys) don't "get" it. Then I'll pack it in! 80% of this post is to test peoples' reaction to it.

Good plan, thanks. I'm only a member of this forum so it was my default starting point! Thanks tho I'll try them.

Those figure are no good even if i DID know the weight, ammo, load... What I'd like, if possible, and I appreciate people are doing me a favour here, is those figures combined with a POI at say 60yds and 200yds. Bullet weight, load spec and ammo (brand?) are irrelevant for this calculation.

Anyone else got any data...? Just FYI you don't need to know bullet weight, barrel length, ammo, powder load, scope type or wind for a linear ballistic calculation. Just muzzle velocity and zero range. You might get slightly different values if you do take into account the bullet's cross sectional density, but I'm ignoring that for this app and I'm using a one size fits all drag figure. The difference is so minute no human could ever shoot that accurately to tell. This app is all about simplicity - And it for people who like simplicity.

Thanks - good response.

Hi Billy, I think you've missed the point slightly - the app has been built - its the User Experience thats the simple part (I'm a designer) Not the maths behind it, which is brutally complex. I know what I'm doing with it :-) And, I don't want to correlate my app against another calculator. The type of response I'm looking for is: "Yeah i've got a .22 rimfire shooting 1034fps cos I crono'd it. Zeroed at 60yds its does XX at 40yds and XX at 100yds" No one needs to know what I'm doing with that data other than it's very useful to me :-)

Hi Guys, OK, so I'm currently making a free trajectory app for iPhone and Android - first up, this is not an advert! I won't even mention it's name (not sure about the forums rules on that but let's play safe, yeah) I'm billing it as "the most simple trajectory app on the internet" and it's looking pretty sweet so far... Anyway, I'm just after a bit of help with calibration. Can I ask anyone who has a VERY FIRM understanding of their own rifle trajectory and velocity to give me some figures... Any calibre.. air rifle to .308 - it doesn't matter. Although air rifle figure would be very useful. Specifically .22 can be very sensitive. In particular: Velocity (not packet claim, observed if possible) Your zero range. and Hold over / under figures you are SURE about either side of the zero range. Honestly guys that would be a real help...! The app will be free but I can credit anyone with assistance on the website if you want! We've done A LOT of maths on this. And I've tested it on a .17 .308 and .22/250. Thanks in advance.

What is / was hunters fen?

Yeah, no worries with SSSI - when I said river I didn't mean the Derwent, which is covered in SSSI :-)

Thanks for the replies, guys... encouraging news from you all. And that book looks great. I've just ordered it online. It reminds me of a book I read once by Will Garfit, called "Will's Shoot". He bought a small wood years ago, chopped it up, dug some ponds and it became a very well respected little shoot.

Other fields and woods. No problems with shot.