300 Win Mag - Target Ammo

[gruntus]

Hi All, 

I am investigating options for a 300 win mag and looking for some guidance on Factory Ammo quality for Target work and also any general "these work well" hand loads for this calibre. 

 I target shoot and field fire . 308 and looking at longer range (6.5 is for another conversation!)  

I suspect there are a multitude of options / permutations depending on the required application so just looking for a ball park starter for ten. 

For factory Ammo are there good stockists that have a ready supply  and in terms of generally accepted good performance are there specific  manufacturer / bullet weights that are a general favourite? 

With regard to hand loads are 155 smk/scenars and 168 smk/tmk/scenars for 308 still reasonable and usable out to 500 yards? For 1000 yards are the above still acceptable or are heavier bullets a must?  (Berger hybrid route). 

Apologies up front for being an armchair enquirer. Just looking to get insight from those that have been down this route before me. 

All the best. 

G