6mm br

Always single fed mine as I don't want any jamming as it goes up the ramp.
Doesn't help your query but how you getting on with it,did the load data I sent you help?
 
First time out of the cabinet just got new Lapua brass with 87gn vmax to start with see how it goes want to get the three round magazine cycling if I can’t I’ll change it for something else 👍
 
The mag is too long & the round is able to pitch as it’s pushed forward.

I use a modified 5 round 223 magazine for my 595 as it is the right length. All you need to do is open up the magazine lips so that they are wide enough for the larger diameter case.

Back when I had mine built there was suggestion that a 3 round magazine for 22-250 would work but I haven’t tried it so can’t confirm either way.
 
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