ORIGINAL: Roskoe
You were probably right the first time. The standard twist for a .22-250 is 1:14, which is great for 55 grain bullets - but real shakey for bullets over 60 grains (depending on length). If you tried the 69 gr. Sierra, for instance, it didn't group well because of twist - not burning rate.
We keep trying to tell ourselves that to make us feel better. Thanks for your support. Sorry about the high jack!