@Beetroot we are using 2206h with the 75 amax's and they are mag fit length. Didn't bother measuring oal as it shot well enough.
The rifle is a tikka t3 hunter abs is a mates. I have just bought a t3 223 last week and will be trying the same thing. Although as I will have it all the time I will try adjusting seating depth and change of powder. From memory the case was full with a slight crush after using a drop tube.
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