Chuck:

I hope you comment is not a dig.

[quote=... Thats where judgement, based on knowledge and experience, becomes relevant.

Or even better, getting real data. [/quote]

I hope you understand that I wasn't suggesting "wives tale" decision model or anything like that. Experience produces the ability to use judgement, and experience includes the gathering of real data. In this case that measn seeing what the pressure gun says and not listening to cracker barrel "truisms" such as "black powder is lower pressure than smokeless". I am always in favor of real data.

In engineering the judgement part comes in when you look at the data and make a decision as to whether or not the differences make a "hill of beans" or whether a given option is worth the additional cost or risk versus the actual benefit.

regards

GKT

Texas Declaration of Independence 1836 -The Indictment against the dictatorship, Para.16:"It has demanded us to deliver up our arms, which are essential to our defence, the rightful property of freemen, and formidable only to tyrannical governments."