sambarhunter,
like the others said, start low and work up, preferably including a chronograph in the process.
I have used a fair bit of re17, but only in284 win.
it seems to me to burn a little faster than 2209/h4350.
it is more temp sensitive, so a load worked up in the cold might get your attention in the heat.
I was using it in an fclass rifle, so loaded purely for accuracy.
it was frustrating, because temp changes could make a load go off the boil from morning to afternoon.
this would probably not be an issue in a hunting rifle, as all accuracy was good enough for hunting.
however, 2209 and 2213sc/h4831 are more available and cheaper, as well as more temp sensitive.
with regards the 9.3x64, 2209 is as slow as you can go and get enough in.
re 17 might require about 2 gns less powder for similar pressure and depending on density might require less compression, but you would have to try it.
my mag is 3.400 long, and I load to 3.370.
it sounds like you have a Lothar walther barrel as do i.
length between 25 and 26 inches.
a note says that in my fls cases, 72 gns 2209 comes to base of neck.
latest testing with 286 gn swift and fed 215 primers in rws brass using 2209.
72 gn 2508
73 gn 2548
74 gn 2575
75 gn 2614
I have loaded 76 and 77 gns safely, but did not want more speed than the 75 gn load so stopped there.
these velocities from a labradar.
compressing 2209 is necessary with these loads, but not an issue.
there are all sorts of theories re obtaining accuracy by adjusting barrel time, and many other methods, but I found all the above loads grouped more than well enough for hunting.
in my case the weak link there is what kind of rest I can get (if any), how fast I have to shoot, am I puffing, other, related to shooter.
I note you seem to be using the x64 a bit.
what are your impressions so far?
bruce.
