Cast Lead Thread ?

[Tokoroa Cast Projectiles]

The case 50% full - is that a thing? Never heard that before, and the 9.5gr TB load I'm using with the 175gr Sub-X pills in the .308 is definitely not a 50% case full load???? I was of the impression that the fast powders like Red Dot, 700X and TB were position-insensitive and fast enough to not present a danger of too much surface area exposed to the primer's flame. The issue with the minimum loads as far as I was aware related to the slower powders with heavy deterrent coatings that needed to held back against the primer in a column to ensure that the powder was not lying flat on the bottom of the case exposing a lot more surface area to the primer's flame. I was of the thinking that the fast powders were basically all ignited near instantly in the loads we are working with for subs, and the danger was more a case of the near vertical pressure curve spiking too high too quickly and producing a dangerous amount of pressure near instantly, or a pill stuck in the barrel with insufficient pressure (not enough powder). It's the fine line game between not enough, and too much...

I use the 50% as a safety measure with small cases and fast powder, I have had light charges barely get the projectile out of the barrel, the last one was a 7mm08 with a cast bullet developing a subsonic load I had a nice group at 50m
the next load was 2 tenths of a grain lower the first shot bounced off the ground halfway to the target, I was using Trail Boss and started with Hogdgons recommended 70% full case and worked backwards, after experimenting quite a bit
50% is safe in .308 size cases, Red dot and 700X are almost as bulky as Trail Boss and make a good substitute, Yes the slower powders can be dangerous if loaded below the recommended minimum start load, though the "Secondary Explosive Event"
as it is called has never been replicated in a lab, but it is still considered real and does happen, the Hogdgon website has reduced loads listed for most popular calibres check them out it is very interesting, If looking for lighter recoil use the fastest powder
listed for the bullet you are shooting as long as the velocity is high enough to expand the bullet or use a lighter bullet.