Case volume vs bullet weight and seating depth

[alpha_romeo_XV]

Here is a visual to show how bullet weight and seating depth are common variables which can affect case volume. How final loaded case volume affects pressure I guess is going to depend on how much powder and its burn rate. Spec case volume is measured with case completely empty.

Was reloading pistol ammo yesterday and yes I've got somce cabin fever posting syndrome going on

[Sandspider500]

38 special
Pre model 10 6" barrel
Lee 358 158TL 2r actual weight 163gr
4.4gr be-86 1.49 OAL 6 shot avg 818
4.4gr be-86 1.55 OAL 6 shot avg 758
4.8gr be-86 1.61 OAL 6 shot avg 808