I just got back from the range testing some 6.5x55 loads that should have clocked around 2000 fps. The Lyman 150 grain gc boolits were cast from 1/2 ww and linotype and sized to .266" in my RCBS lubersizer and lubed with LLA. There was no leading whatsoever, which is good but both loads (29 gr RL15 and 35 gr w760) were crap - the boolits were not stabalized and keyholed the target at 100 yards.
So, you guys that reported this before were absolutely right - but I had to try it for myself
Now, given the total lack of leading, I'm wondering if I just don't need to push them up in velocity... something to ponder.
My other cast boolit load (250 GC Saeco .358" - 356 Win - 2000 fps) did great though! 2" +/- at 100 yards out of my Marlin 336. I'm posting that down in the leverguns forum.
So, the day wasn't a total "learning experience"