Hello David, have found 44.0 gr of N160 works very well in my CZ550, SE topped off with Hornady 140 gr. Viht list 43.4 to 46.7 for 140 heads. Why not start at the mid point and work up or down in intervals of 0.5gr. When you get your best group go down to intervals of 0.2. Hope this helps.
with the 140 grain sst I use 47.3 grains of n160 haven't had them over a chrono but they wouldn't shoot for love nor money until I got the seating to 10 thou off the lands and they are capable of single hole groups now
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