Is one using gas checks?
Cast 405's (actually about 419) are nail drivers in a friend's Guide Gun. Not tried them in mine, but 400 grain jacketed slugs work extremely well for me.
Among the BPCR folks, thoughts are the 405's go to hell after about 400 yds. Most go heavier, like 540+ grainers when stretching out their Sharps.
Last edited by 1minute; 04/15/18.
