Comments on: Spreadsheet Formula Calculates Useful Barrel Life

By: Steve

Steve — Mon, 24 Apr 2017 02:49:33 +0000

Are there updated powder heat potential numbers for the new IMR Enduron powders available somewhere? I love this spreadsheet for deciding on my pet loads.

By: Ian

Ian — Tue, 16 Feb 2010 13:35:19 +0000

i can’t get the dropdown list of the powder heat potential to open up propoly to read all the powders. do you have a list of the powder heat potential for me pleas ?

By: Tom McCrea

Tom McCrea — Sun, 26 Oct 2008 23:05:54 +0000

Great comparative tool indeed. Can the barrel life be correlated to the length of throat erosion, how much further out the bullet needs to be seated to touch the lands.
e.g. when the throat is eroded forward .06 or .12 inches, the useful life is over. It is specific measure at least.

By: Ian Hames

Ian Hames — Sun, 26 Oct 2008 16:18:44 +0000

I think it an excellent guideline, as is the quantifiable overbore index, but just like tire “tread life” there are an infinite number of user-related and equipment tolerance-related variables that will affect the end point.
Thanks for taking the time to share this!

By: Mike Crawford

Mike Crawford — Sun, 26 Oct 2008 16:02:30 +0000

My numbers for powder heat are from QuickLoad. I’m used to using PSI since it’s a real value of measurement. But When I get off nightshift, I’ll look into a CUP/PSI conversion, and consider modifying the sheet to take either. Good idea.
A barrel life-vs-pressure plot(and others) would be an easy addition. I’ll work on it as well.

But please keep in mind folks that my math only represents tweaked rules of thumb used to define consistently claimed accuracy from barrels. Nothing has ever been officially measured as far as I’m aware(like accuracy-vs-shot count-vs-pressure-vs-powder-vs-shot rate-vs-steel grade).
It’s best use is for comparisons.

By: steve podleski

steve podleski — Thu, 23 Oct 2008 22:27:52 +0000

Since many do not have access to the program that calculates pressure , it would be nice to be able to quickly plot barrel life versus pressure. Otherwise great program!

By: Pao

Pao — Thu, 23 Oct 2008 16:15:21 +0000

You need to accommodate for Barrel Pressure in CUP also. Many manufacture show CUP for most common powder used.

By: Joe Pellegrene

Joe Pellegrene — Wed, 22 Oct 2008 14:30:03 +0000

Mike,

Is there a reason why the N165 has such a lower heat potential than all the other Vihtavuori powders?

Thanks