TassieTiger wrote:This is free and will answer quite a few Q’s
https://itunes.apple.com/us/app/sniper- ... 1026883819
brett1868 wrote:Many of the old pro shooters had a summer and winter load to compensate for the temperature. This was more important back then as the powders were not temperature stable, unlike modern powders that are. That being said I still take 3 different loads to each competition and try each before deciding which to use for the match.
Harrynsw wrote:Hi Folks
Have never taken serious consideration in this regard, but now I'm thinking it is a big deal. If I'm at the range I'm a cool morning (say 9 degrees) and zero my .223 in at 100m, 6 months later when I'm shooting at temperatures of 35 degrees, how much will that move me off my 100m zero?
All ballistic modelling relies on standardised parameters.
Variations in "air density" due to temperature, elevation or humidity will have an effect that might not be easily quantifiable, but might only be noticed at long range or sometimes one variable may offset another variable for no tangible effect.
So in your example the answer likely is: Not enough to worry about!
Be aware that many commenters are preoccupied with trivia whose effects are one or two orders of magnitude less than the fundamental aspects of shooting accuracy. This commentary often serves to confuse rather than enlighten.
Harrynsw wrote:Hi Folks
Have never taken serious consideration in this regard, but now I'm thinking it is a big deal. If I'm at the range I'm a cool morning (say 9 degrees) and zero my .223 in at 100m, 6 months later when I'm shooting at temperatures of 35 degrees, how much will that move me off my 100m zero?
Sergeant Hartman wrote:Now the app while a great tool will not tell you the effect the type of powder you use will have on your groups.
in2anity wrote:Just shoot a damned sighter and be done with it. We get two - it's great.
brett1868 wrote:I was probably a bit simplistic in my earlier reply. Temperature and air density are related but lets not forget altitude as having a significant effect. A good ballistic app will take into account multiple factors including the ability to list several velocities for the same cartridge based on temperature. When I compete I keep my ammo in a small esky out of the sun and extract rounds as needed so as not to give them time to cool down or heat up.
in2anity wrote:brett1868 wrote:I was probably a bit simplistic in my earlier reply. Temperature and air density are related but lets not forget altitude as having a significant effect. A good ballistic app will take into account multiple factors including the ability to list several velocities for the same cartridge based on temperature. When I compete I keep my ammo in a small esky out of the sun and extract rounds as needed so as not to give them time to cool down or heat up.
That's pretty hardcore What discipline is that? And what distances? Is that F-Open?
brett1868 wrote:in2anity wrote:brett1868 wrote:I was probably a bit simplistic in my earlier reply. Temperature and air density are related but lets not forget altitude as having a significant effect. A good ballistic app will take into account multiple factors including the ability to list several velocities for the same cartridge based on temperature. When I compete I keep my ammo in a small esky out of the sun and extract rounds as needed so as not to give them time to cool down or heat up.
That's pretty hardcore What discipline is that? And what distances? Is that F-Open?
I shoot FCSA 50 Caliber comps in Australia, I'm also the current 1000 & 600yd title holder in Unlimited and Heavy gun classes. I also do alright in the 1000yd open comps placing 2nd last year. The Aus titles are being held again on the first weekend of October in Warracknabeal Vic and all going to plan I'll liberate more trophy's from the Mexicans
I've been doing a lot of practise out to 2 miles in preparation for a shot in the KOT2M comp in New Mexico next year.
brett1868 wrote:I shoot FCSA 50 Caliber comps in Australia, I'm also the current 1000 & 600yd title holder in Unlimited and Heavy gun classes. I also do alright in the 1000yd open comps placing 2nd last year. The Aus titles are being held again on the first weekend of October in Warracknabeal Vic and all going to plan I'll liberate more trophy's from the Mexicans
I've been doing a lot of practise out to 2 miles in preparation for a shot in the KOT2M comp in New Mexico next year.
brett1868 wrote:in2anity wrote:brett1868 wrote:I was probably a bit simplistic in my earlier reply. Temperature and air density are related but lets not forget altitude as having a significant effect. A good ballistic app will take into account multiple factors including the ability to list several velocities for the same cartridge based on temperature. When I compete I keep my ammo in a small esky out of the sun and extract rounds as needed so as not to give them time to cool down or heat up.
That's pretty hardcore What discipline is that? And what distances? Is that F-Open?
I shoot FCSA 50 Caliber comps in Australia, I'm also the current 1000 & 600yd title holder in Unlimited and Heavy gun classes. I also do alright in the 1000yd open comps placing 2nd last year. The Aus titles are being held again on the first weekend of October in Warracknabeal Vic and all going to plan I'll liberate more trophy's from the Mexicans
I've been doing a lot of practise out to 2 miles in preparation for a shot in the KOT2M comp in New Mexico next year.
Onya mate while i have your attention, do you neck-turn and FLS every reload?
brett1868 wrote:in2anity wrote:brett1868 wrote:I was probably a bit simplistic in my earlier reply. Temperature and air density are related but lets not forget altitude as having a significant effect. A good ballistic app will take into account multiple factors including the ability to list several velocities for the same cartridge based on temperature. When I compete I keep my ammo in a small esky out of the sun and extract rounds as needed so as not to give them time to cool down or heat up.
That's pretty hardcore What discipline is that? And what distances? Is that F-Open?
I shoot FCSA 50 Caliber comps in Australia, I'm also the current 1000 & 600yd title holder in Unlimited and Heavy gun classes. I also do alright in the 1000yd open comps placing 2nd last year. The Aus titles are being held again on the first weekend of October in Warracknabeal Vic and all going to plan I'll liberate more trophy's from the Mexicans
I've been doing a lot of practise out to 2 miles in preparation for a shot in the KOT2M comp in New Mexico next year.