Light or heavy bullets for 20” 338 win mag

200-225 gr projectiles should be a great all around option for you. If you were shooting Brown Bears 200 yards and in, I'd vote 250's. It's not necessary for Moose in my opinion though. Might as well benefit from the lowered recoil using 200-225's, especially for suppressed, as well as maintaining fair speeds. I just built one similar and wouldn't change a thing man.
 
I would push for a 200g class of mono personally for moose.
I am a huge fan of Accubonds and Partitions, but since getting my REM 700 SPS in 300RUM (2015 build) all I have used are 165g TTSX & 180g TTSX in it to date, have taken 5 deer (Sambar) with the 180g TTSX and my Dad took 1 Sambar with the 165g TTSX. These Barnes bullets are a lot different to the TSX I tried 10+ years ago, these group really well and perform beautifully on game.
Another awesome bullet that I have had shoot really well in 3 338WM's and my custom wildcat 338-416 Rigby Improved 45° is the 225g & 250g Accubond, exceptionally accurate.

Cheers.
 
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