Came for reloading advice, got some free pedantry.
My advice is not to call a Bullet a Head.
Projectile works, although, to be pedantic, (IMO) it's only a projectile when its been projected out of the barrel ie 'in flight'.
A brick is a projectile when it's thrown at something, so is a plate and an egg ... but a bullet is a bullet.
As far as reloading advice, thats a whole new ball game.
It's complex.
There are a whole lot of factors that determine what is a 'safe' load and what is dangerous.
VihtaVuori publish a list of load data but even these should not be taken as 'safe' for your rifle.
Vihtavuori N160 rifle powder for large & magnum caliber hunting Vihtavuori’s N160 rifle powder is especially suitable for large and magnum calibers (especially belted Magnums) starting from 30-06 with heavier bullets, .243 Winchester, .260 Remington, 6.5 Creedmoor, 6.5×55 SE, 7 mm Weatherby...
www.vihtavuori.com
Always start below (or at the minimum) and work up to an load that meets your requirements for accuracy and (above all) safety.
You reloading manual will give you loads of advice regarding how to spot when a load is approaching max pressure.
Measure the case capacity and set a COAL that suits your chambering.
Seat the bullet accurately and consistently.
Then experiment with powder wieghts.