As far as factory ammo goes .....
Hornady training ammo 55 gr . It was cheap as chips so I bought a bit of it. The bulk Belmont 55 gr stuff seems ok
but not as accurate on paper. Myself and a mate pulled some to bits and found slight weight differences between loads
Both still more than good enough for all pest control.
We decided we d rather not load for .223 while prices were cheapish
Have lots of brass though if we need it ...
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