Determining "Recoil Efficiency"

[solarshooter]

No that wasn't me but I bet it would help a lot.

 

[mxgsfmdpx]

Inside of 850ish yards, the "cost benefit analysis" when factoring in shootability, wind performance, and first round hit rates in hunting terrain/shooting positions... In the shooting I've done so far with 22CM and 80 ELDX, 80 ELDM, and 88 ELDM it's the clear winner.

There's a reason I'm building a 3rd 22CM as we speak.

 

[khuber84]

Inside of 850ish yards, the "cost benefit analysis" when factoring in shootability, wind performance, and first round hit rates in hunting terrain/shooting positions... In the shooting I've done so far with 22CM and 80 ELDX, 80 ELDM, and 88 ELDM it's the clear winner.

There's a reason I'm building a 3rd 22CM as we speak.

I don't find much perceived difference than my 6cm with 109s at 2950 and 22cm with 88s at 3040fps. This is from the same exact rifle setup, with 18" light palma blanks, running DD wolf hunter can.

 

[mxgsfmdpx]

I don't find much perceived difference than my 6cm with 109s at 2950 and 22cm with 88s at 3040fps. This is from the same exact rifle setup, with 18" light palma blanks, running DD wolf hunter can.

My identically setup 6CM and 22CM are close yes, with the 6CM still producing around 1.75-2 ft lbs or so more free recoil energy usingf 108's versus 22CM with 88s.

 

[stan_wa]

could even create my own version of WEZ at that poi

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Do it and your cool !

You have kind of posed this data with the goal of seeking to find the most efficient way to get a certain number. I would kind of like thinking about it instead in the terms of how much recoil can you accept such that you can still spot impacts and then therefore go get the most wind number you can for that recoil.

 

[aschuler]

I'd like to code up my own ballistic solver at some point so that I can quickly solve for lots of trajectories. Then I could populate the full table quickly. I could even create my own version of WEZ at that point...

I built my own crude version of WEZ at one point to play around with. It's a fun exercise.

There are plenty of projects to reference project on Github to get started, including ballistics solver libraries you can use right away.

Here's are a couple of examples

GitHub - grimwm/libballistics: Ballistics Library

Ballistics Library. Contribute to grimwm/libballistics development by creating an account on GitHub.

github.com

GitHub - jnewing/SBC: Simple Ballistics Calculator

Simple Ballistics Calculator. Contribute to jnewing/SBC development by creating an account on GitHub.

github.com

 

[Sako300]

Shoot some of the more aggressive brakes (SRS, etc……) and your recoil impulse and movement might improve. Just have to deal with the noise factor.

 

[Sako300]

I have shown some calcs in the past where I've done point assessments of certain cartridges/bullets/rifles to try and determine what is the lowest recoil way to get a certain wind number. Today I decided to elaborate on this a bit and assess recoil and wind number as a function of MV and caliber.

First, I created a reference bullet for each caliber which has a weight and BC representative of the highest performing bullets in that caliber.
View attachment 820767

I then estimated powder charges needed to get that bullet to the given MV in a roughly 20" barrel. This is cartridge agnostic, and may not be perfect. I use this in conjunction with bullet momentum to calculate total recoil.
View attachment 820768

I then calculate recoil in a 9lb rifle, run the bullet at the given speed to determine the wind number, and finally calculate wind# per recoil.
View attachment 820770

The way I would use this chart is to narrow in on what bullet at what speed gives you your desired performance and what the "recoil efficiency" of that combination would be. You could then pick your barrel length and cartridge to get you that performance target. For instance, if you ask what is the minimum recoil way to get an 8mph wind number gun, the answer is a 6mm bullet at 3200fps or so, aka a 6UM. It also shows you the recoil INefficiency of larger calibers - moving up in weight is almost always less recoil efficient than going faster.

Is the 180 ELDM .401 G7 BC? .284

 

[DangerRanger]

This is awesome, thanks!

Makes me wish for a 6 or 25 prc

 

[solarshooter]

Is the 180 ELDM .401 G7 BC? .284

I'm using the AB value of 0.360.