not to familiar with the 6.5 cartirdges, but will look into it more.which 6.5's should i be looking at or avoiding?
There are no 'bad' 6.5's. They just fill a niche which may or may not suit your needs.
The smallest to biggest popular cartridges are 6.5 Grendel/PPC; 6.5 BR/Dasher/BRX; 6.5X47L/Creedmore/XC/IHMSA; 260R; 6.5 Mystic/260AI/6.5Swede; 6.5 Swede AI/ 6.5 - 6mmRem; 6.5-284/6.5-06.
You just increase the case capacity allowing for more energy to push heavier bullets faster. They can all be made to be equally accurate - not necessarily at the same speeds.
The larger you go, the faster the barrel wear but the higher the velocity potential. The easier it is to reach common operating velocity with heavier bullets.
The smaller you go, the higher you need your operating pressures to get the same performance. This is important if using commercial actions. They can also be tempremental when run at elevated pressures. In their design parameters, no more no less difficult to work with then anything else.
Decide what type of rifle you want/function, what you want to do with the rifle, how far you want to shoot - pick your poison and have fun.
There are now so many awesome bullets that any application can be filled.
There is a very nice post on the 6.5 choices a few posts away. Again, there are no right answers and lots of solid opinions.
If you are looking at a LR blaster, I like the 260AI/Mystic/Swede case volume as a do anything, no brainer way to launch the heavies in moderate length barrels at desireable velocities.
Some like them bigger, others smaller. It's all good.
Best thing is spin on a barrel and go have fun. In a good season of shooting, the barrel will be toast and you will get a chance to play with something new.
Who knows, by then the hot concept might be a 25 or 5.8mm????
Jerry