IMHO you already have a good target projectile to give a crack
the 168gr zmax, amax rebranded
I suggest to fireform the cases I sent you with something (bullet) you want to waste but sight in your rifle with at 200 minimum
do a 10 shot satterly test with the 168gr zmax at 200 minimum to find a flat spot in velocity/pressure over a chrony using .5gr powder increments
then do an OCW test around the flat spot
I believe it would be a mistake to try more than one load at a time, at least one OCW test
where howa have it over the tikka is that with the tikka you cannot make any adjustment in seating depth for tuning and have to just put up with a mag oal
your mate's tikka will be doing a big jump using 165gr bullets and has to be nearly perfect in concentricity to shoot straight with tight groups
because you dont have to load so short you will be able to use more powder with less pressure and get way better velocity
with the tikka there is a problem with using vlds unless single loaded so your stuck with tangent ogives, no worries for close work
but the 300wm is meant to be able to stretch out and that's why you use secant ogives
lots of fun
“If you do not read the newspapers you are uninformed. If you do read the newspapers you are misinformed”. Mark Twain