B.R.,

I checked Grafs.com, and they show 20 different bullets available in .303 cal. Albeit all not .312 in dia, some like the Remington is listed at .310... and others at .311. But until you slug the barrel you don't really know what the groove diameter of a particular rifle is. Knowing Ruger, it could be as small as .308". o:

BTW, listed is a Hornady 174 gr., HPBT, a 150 SST, and a Sierra 180 gr. Spitzer. Not mentioned are Norma offerings, which will, of course, be a bit pricey and hard to find... but available none-the-less...

GH

"As you walk thru life, don't be surprised that there are fewer people that you encounter seeking truth than those seeking confirmation of what they already believe!"