Cast bullet weight to load data ???

[Willyp]

My Lyman manual #49 states that for the mold # 311672/160gr,the starting load of 4759 is 18 grains up to 27.5.
This is for a 160 grain bullet. My cast bullet,from this mould and alloy mix,is 165 grains with the gas check on it.
My question is; Even if my cast bullet is a little heavy,do i still use the 160 data or what is to be used????
I am loading for my 308,in a mod.700 Rem.

[btroj]

Use that data. This is why we start low and work up.
Bullet weight with cast will always vary unless you are using an alloy direct froma foundry wih a known composition. Even then there are small variations from mould to mould if they are cherry cut. Lyman also has "redesigned" some moulds over the years.

I usually am nowhere near max pressures so I find a bullet in the weight range I am using and start with that data.

[Willyp]

Thank you,btroj.