.30 Maverick getting cranked up!

I need to go measure them.. they are long enough that they don't even fit into my single loader. I have to remove that too and then literally put it in by hand. I have some good ideas for a gravity fed magazine that would be able to feed the longest of slugs but would need the help of someone with the skills on a 3d printer or something.
Could you check the diameter as well? It's not listed on their website.
For the gravity loader the slugs would have to enter the barrel at an angle. I believe they are longer than can fit inline. What's your idea for the design?
 
Obviously this is extremely crood. would simply want the slugs to roll down in perfect alignment with the bore. The "ramp" coming down could have a lid or or simply a lip to hold the other slugs coming down. However in my thought the width of the ramp could be the full width of the breech with the support "lips" to end flush with the side of the breech without taking up interior room. Maybe that makes sense. I'm sure given some time I could really draw up some better stuff with actual measurements.

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