Cast Lead Thread ?

[rambo-6mmrem]

. The famous 13gn red dot in a 30 cal case "The Load" is no where near 50%. - fast.powder. use 6gn Noble Shotgun 78 in 308. Close equivalent to Red Dot and AS30N. No filler, no issues. Same with 303B. You run into trouble with fast unpredictable pressure spikes above 13gn. Like when your chrono which has been recording 1650fps suddenly shows 2400! And it takes a mallet to lift the bolt. Yikes!. Shot my last fallow with 308, cast 200gn, 6gn Nobel 78. Subsonic.

Your normal rifle powders you mention 50% - I thought optimum was 80% above. Except for a few with published load data for reduced loads..what your referring to yes?

for reduced loads personally, I use a powder that is way slower than one typically used for caliber
for example, I have a Remington rolling block in 6.5x55 it's only rated to about 40K psi when new (sammi 6.5x55 is 55k) so no factory ammo for this puppy and it's old and I will keep it well under that no point in pushing your luck

i use adi 2225 normally for magnums and certainly to show for your standard 6.5x55 load
at 45gn with a 140gn bullet, this gives me 90% case fill for good ignition
but keeps pressures down to 27,000psi

it's a good way of doing it because there is simply no way you can fit enough powder in the case to get into trouble with pressures

both I and @akaroa1 have developed loads this way and prefer it to the small charge of pistol/shotgun powder method

although that being said we aren't trying to go subsonic
the 6.5 load above is around 2450fps extremely slow for a 6.5 but certainly not subsonic