School me on mils

[Nine Banger]

Sea level and high humidity takes its toll here.

Humidity doesn't effect external ballistics but I keep an eye on DA.

I shoot at 6-11 feet in the Coastal Plain. RH is 93% right now.

DA will probably be around 2000 this afternoon when it hits 87.

I've measured DA around -1400 in the winter here.

For 22 cal projectiles 22-250 and 22 Creedmoor case size can get you to quick drop with lots of wiggle room if you reload.

 

[J.B.]

great video, anyone know the correction factor for a 6.5prc in the quick drop formula?

Mine shooting a 147 eldm is -.4 and this puts me within a tenth to 600

 

[rogerdoger]

Mine shooting a 147 eldm is -.4 and this puts me within a tenth to 600

So if your yardage is 450, you would be at 2.9mils?

 

[Nine Banger]

So if your yardage is 450, you would be at 2.9mils?

2.1

 

[justin davis]

Quick drop doesn’t work for my setups. My bullets are going too fast for the equation to work. It sounds cool but doesn’t work for every setup

 

[J.B.]

So if your yardage is 450, you would be at 2.9mils?

As nine banger said, 2.1. I take off two, then another .4
2.2 is the actual solution in my ballistic calculator.
At 600, the solution is 3.6 mil.

Will see how well this works in the field, I am only 20 rounds into my prc and mils, so a long ways to go lol

 

[The Harbor Master]

As nine banger said, 2.1. I take off two, then another .4
2.2 is the actual solution in my ballistic calculator.
At 600, the solution is 3.6 mil.

Will see how well this works in the field, I am only 20 rounds into my prc and mils, so a long ways to go lol

I'm there with you. I haven't even mounted my first mil scope so I have a long ways to go. Im sure I'll be posting plenty more smooth brain questions in this thread, because as much as I want quick drop to work perfectly for my rifle, there's probably variables Im too noob to expect.

 

[J.B.]

I did a forum search on wind brackets, but didnt find anything specifically on wind only …is it as simple as knowing your guns number (7 mph for my 6.5 prc) and then learning what 7 and 14 mph wind feel and look like down range? Obviously this takes time, and things at the target can be very different than at the shooter…

 

[Castle Rock]

Humidity doesn't effect external ballistics but I keep an eye on DA.

It does have an effect on DA, more moisture means less dense air .
This seems counterintuitive, I know and until now I thought the opposite was true

 

[Jordan Smith]

It does have an effect on DA, more moisture means less dense air .
This seems counterintuitive, I know and until now I thought the opposite was true

Yup, humidity does affect aerodynamic flight, but the effect is minimal. Water vapor molecules are less dense than air, thus high humidity reduces the overall atmospheric air density.

 

[mxgsfmdpx]

For fun… Go shoot at realistic hunting ranges, say out to 500 yards, in the rain, and watch how it does nothing to your POI on targets.

 

[Nine Banger]

For fun… Go shoot at realistic hunting ranges, say out to 500 yards, in the rain, and watch how it does nothing to your POI on targets.

If you really want to have some fun go shoot 12 gauge shotguns in a torrential downpour.

 

[Bluumoon]

So I drank the kool aid, and I ordered a Maven rs1.2 in mils. Ive shot moa all my life, but the proclaimed benefits of mils made me figure it was worth learning a new system.

I have a basic understanding of wind brackets, but what further benefits do guys get using mils? Explain it to me like I’m ten lol

Also, are most guys still using yards with mils, or did you switch to meters as well?

B

Thread 'Compilation of Formidilosus posts'

Apr 16, 2022

Hopefully this doesn't step on any toes. I've found Form’s posts to be incredibly useful and have spent more time than I care to admit digging through his posts. Attached are a few of the "core" posts I have saved for reference and to share with friends. To be clear, this is all Form’s content, some is older work and views may have progressed

@Formidilosus Thank you! If you have put all this in a book/website/ program let me know and I'll buy it. If not, you have a heck of a start, sign me up when you do. If the post violates decorum, please let me know and I'll happily delete...

• Bluumoon
• Replies: 59
• Forum: Firearms

•