challenge for the ballistics gurus!

[BusterB]

Ok, so I got bored today, which is dangerous, and got to playing on JBM looking at random drop tables from completely fictional data. It really got me thinking though, whether it would be possible to have a stable of rifles that you could have the same drop chart for, out to the practical range of the rifle.

So my challenge for you is to come up with 3 existing calibers with realistic data for bullet,case,velocity,etc. The challenge is coming up with three that match up to be able to theoretically hit a 6 inch target within the reasonable range of that rifle, with all 3 guns having as close as possible to the same drop/wind. Have one rifle based on .223 sized boltface, one based on .308 boltface (short or long action), and one on magnum or lapua boltface. I am aware a .223 based rifle will not match with a lapua at 1000 yards, but like I said, within reasonable ranges for the rifles.

So is it going to be possible????
post up and lets see!

 

[Bear24]

Re: challenge for the ballistics gurus!

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BusterB</div><div class="ubbcode-body">Ok, so I got bored today, which is dangerous, and got to playing on JBM looking at random drop tables from completely fictional data. It really got me thinking though, whether it would be possible to have a stable of rifles that you could have the same drop chart for, out to the practical range of the rifle.

So my challenge for you is to come up with 3 existing calibers with realistic data for bullet,case,velocity,etc. The challenge is coming up with three that match up to be able to theoretically hit a 6 inch target within the reasonable range of that rifle, with all 3 guns having as close as possible to the same drop/wind. Have one rifle based on .223 sized boltface, one based on .308 boltface (short or long action), and one on magnum or lapua boltface. I am aware a .223 based rifle will not match with a lapua at 1000 yards, but like I said, within reasonable ranges for the rifles.

So is it going to be possible????
post up and lets see! </div></div>

Sounds pretty cool! Were you able to do it? I will be watching this thread to see what comes out of it.

 

[BusterB]

Re: challenge for the ballistics gurus!

was able to get 2/3 pretty close, getting all 3 is going to be a challenge though!

 

[bluezx14]

Re: challenge for the ballistics gurus!

If you are talking practical range of load I.E entering transonic, that is easy all these loads are entering transonic at sea level and standard atmosphere at around 750 yards so that is the "practical range" for drop and drift that I have used (drift is 10mph full value).
204ruger 40gr vmax @ 37200fps, drop 127.9", drift 73.2"
243win 65gr vmax @3680fps, drop 128.8", drift 72.3"
300win mag 110 vmax @3620fps, drop 129.2", drift 70.2"

This is of course using quoted B.C. but all from the same manufacturer.

 

[BusterB]

Re: challenge for the ballistics gurus!

Quite impressive blue, I hadn't even considered a 110gr in a win mag, math works out although it sorta cuts its feet out from under it! Nice call!

 

[knockemdown]

Re: challenge for the ballistics gurus!

Pick your bullets first.
Match them by b.c., close as possible to each other.
Then, pick your cartridge for each boltface, according to how fast it'll push your chosen bullets.

You're done...

 

[tylerw02]

Re: challenge for the ballistics gurus!

What purpose would it serve to have data that matched?

That would defeat the purpose of having something like a .223 Rem, .308 Win, and .338 Lapua. If the data is the same, one rifle is all you need. The point of going bigger is so you can shoot farther. I don't subscribe to "just to have". Use what you have to its potential. That should keep a guy from getting too bored

 

[Rhys]

Re: challenge for the ballistics gurus!

I did this a couple years back for a pair of hunting rifles. Ended up going with a 375h&h and a 6.5x55

 

[BusterB]

Re: challenge for the ballistics gurus!

Ideally what I was looking for is not the exact same to the end which could be close to being acheived by using bullets with the same bc at the same velocity. Like in blue's example, the path is the exact same for all 3, which is impressive, but it also cuts the legs from under the winmag. Here is sort of a picture of what I am talking about, although the .204 and .243 match up quite nicely, so just having a big boomer to get a lil' farther with more energy would round it out nicely. I want to take full advantage of all 3 calibers. using the smaller ones for the more frequent shooting, then switching to the bigger ones when the lil' guys run out of juice.

 

[BusterB]

Re: challenge for the ballistics gurus!

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tylerw02</div><div class="ubbcode-body">What purpose would it serve to have data that matched?
</div></div>

the advantage would be for example, in hunting, if you see an animal at a range that would be an ethical shot for the caliber you would have set in your head that 350yds= X minutes of adjustments whether you have the big or small gun. Can get cheap and less painful practice and still be able to make more confident shots.