Sorry Blokes,
Been a bit short on time.
Comp ended up being 500, 600, 600 comp as our 700 yard mound is a pile of truck dumped dirt.
I went with 45.3gr 2000-MR at 2.885" COAL at 2800fps. Lapua 260rem cases expanded up, RWS Primers.
I used Strelok and come ups were as indicated for...