Re: 2 questions
Brass lifespan is a product or the rifle and the loads, and cannot be predicted in any more than a very general manner.
Loads are published in two flavors: loading manuals which show min and max loads, and sometimes a most accurate load; and anecdotes which suggest specific loads for certain particular firearms.
If you're looking for an ideal load for your rifle, the odds against finding a precisely ideal load on the net are almost certainly against you.
The best you can usually hope for is something close, and use that as an anchor point from which to branch out and develop something more ideal.
Loads that don't specify the details of the rifle (at least barrel length and rifling twist) for which they are optimized are practically useless, and maybe worse, because they could be so far off from your rifle's preferences that all you end up doing by attmpting to copy them is to experience unnecessary frustration while you waste components on poorly anchored load developement.
Load development is a long and well perfected process.
The loading manuals will tell you how, and once you try all the other methods, you'll come back to the methods offered in those manuals because they are the most direct and effective methods available. Save the frustration, cut directly to the chase, and just read the damned books.
Greg
