I shot a lot of cast through my 308 for best accuracy you should match your pressure to the hardness of the bullet. linotype bullets would require a peak pressure of almost 32,000 psi to seal the bore effectively.
So you load to this pressure. The lee manual has the pressure calculation for reductions in grainage for all the Hodgson powders. This would be a good starting point to work around to develope an accurate load.
Also your bullets are probably small. If you could get your hands on some pure lead (it is softer) cast a bullet and pound it into your barrel. Remove it and measure the bullet. If it is 308 you should probably size it to 310 or 311.
Not trying to dissuade you from casting for your 308 I did it for years, You will find that what works best is to load it down to 30-30 levels. I just discovered the 30-30, yes I know it has been around for 110 years or so. You can basically do anything with a cast bullet with it as you can with a jacket. no downloading required.
i have problem casting it to .310 or .311 out of my rcbs mold.
you think may be the problem is in the linotype? or casting temp.?
i reloaded 20 shells, already using 4895 starting 30gr. to 33 gr.
will test them on friday.