Thread: 303 cast bullet data trail boss powder

Hi does anyone have a link or data there willing to share cheers

To quote another, "303 lee molds are the best. Use Hornady gas checks and 39gr 2208"

Originally Posted by bluecod

Hi does anyone have a link or data there willing to share cheers

Start at 9.0 grains and go lighter for subsonic and higher for supersonic, for more power 212 grain cast bullet with 27 grains of 2206H works well in most .303's

303s can be a bit fiddly with cast bullets depends on the state of the bore amongst other things.
example 2groove long branch excellent bore cant get it shooting them. Martini enfield carbine worn and pitted shoots well with paper patched ones. no1mk 1 good bore shoots both patched and straight cast ok. I found trailboss not to be the ideal powder for accuracy, blue dot shotgun powder 10 grains and no filler gave me more consistent results.

Originally Posted by bluecod

Hi does anyone have a link or data there willing to share cheers

castboolits website has it all. You will need a bit of time spare to get the best out of it.

303/308 loads are similar for low velocity. 8-10 grains of shot gun powder for sub sonic works well with 200 grain projectiles.