300 yards is all that's available to me.

Lets work up a ladder test for my .300 wsm, Here's my normal load development for this Cartridge,

165 TSX or GK, 64-67 grains of H4350,with 65 grains almost always showing the best group, I use a difference of 1/2 grain of powder with 5 shells loaded per charge.

Stay with .5 grain increments or drop down to .2 increments?
Still focus around 65 grains with .2 diff?