I'm using 2208. 19" barrel on my 708.
No idea of speed - never had the use of a chrony - but shoot 43 grains in R-P brass behind a 139gr Interlock. Seems to group okay - 3 under an inch at 100 metres - I'm not a great shot but can do this regularly. I also reload the 120gr Nosler ballistic tip - exactly the same powder load (because I'm lazy?? ) and it groups just as well if not better. It does shoot to a different POI (about 6 inches at 100m) but I know what the scope changes are....so not too bad to change between loads and only need to poke a couple down the tube to verify all's okay.
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