This is a fin-stabilised armor piercing round for a potato cannon with a 1.5in 40sch PVC barrel, the barrel shouldn't be rifled, as that would most likely break the fins.

Ender 3 S1 Pro:

80% infill 6 perimeters Brim No supports

Note: These have not been specifically tested, but I have a lot of experience printing rounds and this should work.

Disclaimer: I'm not responsible for any consequences that result from this model. What you do with this is your responsibility and your responsibility only.

Note: Please credit me if you use this in any online content, and if you reupload you have to put a link to the original model page, and put my username in the description.