Free Recoil calculation spreadsheet

[Len Backus]

I created this Excel file several years ago.

Input the weight of the rifle, bullet and powder charge, add the bullet velocity, stir well and it spits out the ft-lbs of recoil.

Click on the link below to download the Excel file.

[johndoe]

Very cool.

[LouBoyd]

There's not sufficient input information to determine the average velocity vector of the molecules of the propellant gas. Certainly barrel length, expansion ratio, propellant pressure (or temperature) and the effect of a brake (if any) imake a difference in recoil even though all the parameters used in this spreadsheet are held constant.

Some programs (like Quickload) give one recoil emergy calculation as the bullet passes the crown and another value after the propellant has exited the barrel. The first number is the same wiith or without a brake. The second can be more or less with a brake and can be considerably different. Quickload however doesn't calculate the effect of a brake. Brake manufactures dont give performace data which can be used in calculations, at least none that I've seen.

This spreadsheet appears to be the result of empirically fitting of measured data from tests on typical rifles without brakes. For that I expect it works fairly well.
.

[frederick.208]

Thanks

[Len Backus]

There's not sufficient input information to determine the average velocity vector of the molecules of the propellant gas. Certainly barrel length, expansion ratio, propellant pressure (or temperature) and the effect of a brake (if any) imake a difference in recoil even though all the parameters used in this spreadsheet are held constant.

Whatever.

[Bull45cal.]

Mr. Backus,

I have a simple chart I made in excel that I feel maybe helpful to a few folks. Would you be interested in posting it as an attachment? It is just a RPM calculation chart that I used to "help" determine if bullets that stablize in one barrel will do so in another. Just let me know how to proceed.

Thank You,
Shane

[cdes29]

How big is the difference in recoil between different powders (fast burning vs slow burning).