A very usefull post Stretch, but concerning the weights of piles, from records you have kept..which pile weight grouped better in the wind? Logically, from info off other posts in this thread and others, the 120grn should have offered the least spread but I'm presuming this result.
As a footnote..I have received from an engineering company in Exeter (today) some home grown piles of what I think could be a compromise between the Stainless Steel and Tungsten in both weights and price. Alas, as with most things I seem to get done these days (or not), all of the twelve I asked for had bent shanks

...

Unbelievable but true, so I told the boss man where he could put his bent piles and it was where the sun don't shine if that was the best his company could do. It took them two weeks which has been my time wasted..but hey ho..they looked good if nothing else!
More to follow on this in the coming weeks as I might be asking for testers of M.B. and above (lady/gent..recurve/compound)