Been playing Conquest in Portal mostly, but some occasional Conquest, Breakthrough and Rush via the main menu or with "This Week's Game Mode."
Where can I find information about what masteries are capped on certain servers? That seems odd.
@BHizzle57 Everything is capped at tier 3, and yes Sundance tier 3 is 240 kills, and Paik tier 3 is 600 spots. So It seems you have been playing on modes with restricted XP.
Before you join a server check the XP level. Once you select the server you should see a button "XP Full XP" This is the case for all modes on the home screen with exception for the SOLO/CO-OP games under Conquest and Breakthrouh, these will give moderate XP, meaning you can level up until end of tier 3. This goes for all weapons, operators, vehicles and gear.
The 2 featured game modes in portal will also provide full XP, however if you choose from the browser or host an experience you need to check per server if it provides full XP. Only then you can progress beyond tier 3.
@BHizzle57 Sorry for the slow reply. As @RanzigeRidder2 said, it sounds like a lot of what you've been playing won't grant full Mastery progress (anything official will, other than Solo/Coop, as mentioned).
Here's where you can see whether an experience in the Portal browser will let you progress things fully:
