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If you are having real issues with weight and you happen to be playing on hardcore, then yes, leave the AMR at home.
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45-70 SWC has a HUGE maintenance multiplier of x3, making it rather impractical, and even so it's only 5% better than match rounds. The ammo weighs a lot, but match rounds are some of the best out there - increased damage by 15% and reduced spread with no downsides.
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Up close, some of the quick-firing weapons are indeed better. Only a crazy person would use that kind of weapon up close.
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