Thread: Ballistics of various calibres and coefficients

Originally Posted by gimp

It's relevant, you've just gone out of your way to select bullets with very similar ballistics coefficients rather than actual good bullets that someone looking for long range performance would use, so, whatever

Your misreading my point. Which is- Dia. of your pill is largely irrelevant between 6.5, .277,7mm,.308 for coefficient. If you already knew this then why bother chiming in trying to derail the conversation with your smart alec attitude?

Originally Posted by FRST

Your misreading my point. Which is- Dia. of your pill is largely irrelevant between 6.5, .277,7mm,.308 for coefficient. If you already knew this then why bother chiming in trying to derail the conversation with your smart alec attitude?

It's not irrelevant, because to get a "good" BC in the .6 range with a .30 cal for example you're looking at a 210gr bullet, which has a LOT of recoil, and you need a case on the order of .300 win mag size to push it as fast as a .260 can push a .6BC bullet, for the same external ballistics.

150grain round nose launched from a 308 win at a realistic 2850fps.

Attachment 22276

178grain amax launched at a comfortable 2975fps from 30-284

My argument is relevant when people that I know are running around with all the latest wildcats 6.5 this that or the other thing. "6.5 will hands down beat 30 cal blah blah blah when it comes to coeffients blah blah blah. My 6.5 cheats the wind blaaahhh" Just seems a little pointless when a standard 270, 30-06, 7mm rem mag or 300 win mag will do the job.
How many people hunt with round nose bullets Vietnamcam? Stuff all unless you're a pig hunter with a 30-30.

Used to use em not very long ago at all for bush

Originally Posted by veitnamcam

Used to use em not very long ago at all for bush

Yes. The bush. I rest my case.

Ok here is a 150gr interlok boat tail.



It has twice the windage of a better pill out of what is essentially a 30-06

Here you go then Gimp, 6.5 140 Berger Vld


Sent from my iPhone using Tapatalk

30 cal 155gr Berger vld. Very little difference at 1000 yards. I wonder what would have more energy?


Sent from my iPhone using Tapatalk

Here Gimp, I'll even drop the 30-06 velocity down for you.


Sent from my iPhone using Tapatalk

There's something seriously wrong with your calcs there fulla. When I run a 30 cal 155 VLD @ 3050 in a 6mph wind Balistic gives a drop of 28 moa (so 112 of your 1/4 clicks ) and 5.3 moa Windage. ( 21 1/4 clicks). ??


Sent from my iPhone using Tapatalk

Just leave him to play with his ballistic app. If he did any sort of shooting at distance with the projectiles and velocities he's using in his examples he would realise really quickly how silly he's sounding.

Till then......

Originally Posted by sneeze

There's something seriously wrong with your calcs there fulla. When I run a 30 cal 155 VLD @ 3050 in a 6mph wind Balistic gives a drop of 28 moa (so 112 of your 1/4 clicks ) and 5.3 moa Windage. ( 21 1/4 clicks). ??


Sent from my iPhone using Tapatalk

And what does you're 140gr 6.5 come out at? -post it up. I'm happy to be proven wrong.

Originally Posted by FRST

And what does you're 140gr 6.5 come out at? -post it up. I'm happy to be proven wrong.

At the same velocity and conditions the 6.5 140 shows 22.3 moa drop and 3.4 moa Windage. So at 1000 Yds it has 20 inches less drift and has more energy.


Sent from my iPhone using Tapatalk

I think what is actually important with the bc of a bullet is the windage, drop is the easy part.

Wind is often misjudged, and therefore a higher BC bullet is more forgiving when you Getty the wine wrong. Just about every thing else can be measured easily.

Sent from my GT-I9505 using Tapatalk 2