Just got my first 20 brass cleaned, sized, and primed. I have measured to the lands in my rifle can't remember the measurement at the moment its at home. my question is if my magazine will handle the length and the rifle will eject a live round should I start my ladder touching the lands or should I jump? If I need to start with a jump how much I have seen on here .020 and recently read .065 also.

1903A3 sporterized
Nosler partition 200gr
Reloader 19 starting at 52 per the nosler manual

Thanks
Scott