As long as the modern ammo is standard velocity it should be OK. Different OAL from different makers may be encountered, and this can affect feeding.
What you need to avoid is +P, +P+, or NATO marked ammo. Steel cases are obviously harder on the extractors.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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