From SnipersHide
"I have used 70 gr r-26 in my 300 wm and am able to get 3035 with the 215 hybrids. I got up to 3080ish with heavier bolt lift and an ejector swipe. I am seated out to 3.710 oal length roughly or 2.95 to the ogive. Same powder charge of h1000 got me 2950ish. I was able to get it down to an es of 18 with a ad of 8 which I think is good enough for the sendero sf ii for me.I have shot a .4 group at best but usually am around .6ish. With about a 3.25 in group at 560. Haven't been able to take it farther yet.The speeds were taken with a magneto speed. I don't use quick load to know what pressure I'm running but I have 3 reloads in nosler brass and all primer pockets are still tight with no bulge above the belt."
He's using a longer mag box. Partitions have a shorter bearing surface I'd assume? Start around 68.0 and work up from there?
