need long range cast advice

http://www.castbulletassoc.org/view_user.php?id=7820>swed6.5

You don't have an impossible problem at all. I'd recommend a through examination of your bores in 30 cal and 8 mm. They will likely benefit from a polishing for cast bullets as cast bullets like a slick smooth bore for match accuracy with cast.

Check my Polishing method posted on this site: http://www.castbulletassoc.org/view_topic.php?id=8364&forum_id=63>http://www.castbulletassoc.org/viewtopic.php?id=8364&forumid=63

Next, to go all out, I'd recommend a chamber casting to determine your chamber throat dimension to determine the diameter to size your bullets. They will have  the best accuracy with a sliding contact to the throat upon chambering loaded rounds. Chamber Casting Alloy: http://www.rotometals.com/product-p/chamber_casting_alloy.htm>http://www.rotometals.com/product-p/chambercastingalloy.htm

This an excellent product with good instructions at the site and is a lifetime supply for $15.99

Your bullet fit is the most important factor  in accuracy with cast. The heaviest bullets for caliber get the best accuracy. I shoot the Lee C312 185-1R cast in #2 alloy and sized .3105” to fit the throat of my 1903A3 Springfield 30-06. I lube once before size/check and twice after with 45:45:10 tumble lube. My load and rifle will do what you are looking for with 42 grains H4831SC and Lee Collet Neck Sized brass when loading. My bullets engage the leade  of the rifling .010” and get  a stable start to shoot the best my rifle can do with cast. This bore was new and un-fired when purchased but was still polished nice and slick for best performance with cast.

45:45:10  Post reviewing and source links:

http://www.castbulletassoc.org/view_topic.php?id=9290&forum_id=16>http://www.castbulletassoc.org/viewtopic.php?id=9290&forumid=16

Gary