My go to coyote cartridge is the 20 Tactical, which is very similar to the 204R. With the 39gr Blitzking, it shoots flat and does well in the wind. However, it isn't used often for ground squirrels, because the barrel heats up way to fast for high volume shooting. As to twist rate, a faster twist rate is preferred for heavier bullets, but the 1 in 12" works for 32-39gr bullets.
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