6.5 Creedmoor Dummy Round
thingiverse
I used 10 bottom layers to prevent the casing rim from shattering, 4 walls(I would go 5 or 6 next batch) Infill as much as makes you comfortable, 60% is fine for my smaller calibers so I used it for 6.5, but it may need more, time will tell. I haven't had any issues with any calibers breaking inside the firearm, if you run into any issues let me know! Also, if the rim does break off, just use a cleaning rod to pop it free. The firing pin hole should prevent the firing pin from pushing it into the breach too much.
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