Reloading Trays / Blocks which are efficient!

There are some great reloading trays out there. I don't think my design is particularly better in most ways, but they're pretty good at using only a little bit of filament in comparison.

These should only take up 30-40 grams of filament (depending on version), meaning you should be able to get around 25-30 out of a standard roll if you really wanted to. Even the cheaper reloading blocks are still AUD$10 so using cheap filament makes this an economical option.

My drive to design these was to make a whole heap I could use when spraying my brass with OneShot lubricant. I've got a couple of nice trays I use for loading powder, and didn't want to necessarily get them soaked.

Hope you find them useful.

I've uploaded two versions to start with - a 308 version and a 223 version. They both come from older cartridges, but I thought these are the most common references these days.

The 308 version should suit any cartridge with a maximum diameter of 12.0mm or around 0.473". In the image above, I've got brass to suit 308WIN, 6.5 Creedmoor, 243WIN, and 270WIN, but it would suit many, many more cartridges.

The 223 version should suit any cartridge with a maximum diameter of 9.6mm or around 0.378 inches. The picture has 223REM and 300BLK in it.

Recent additions for 30-30, 300 WIN MAG and 338 Lapua. I don't have any of these, and haven't printed them, so I hope they're right.

Want another size? Drop a request in the comments and I'll see what I can do. Might make the walls a bit higher for some of the longer cartridges.

I found having 3 walls (using a 0.4mm nozzle) was a good trade off between strength and material. As long as you're using at least two perimeters, you should be fine; they'll be solid.

The base is 2mm thick so if you have 4 solid bottom layers and 5 top layers, using 0.2mm layer thickness, there'll be a single layer of infil. I'd suggest having 40% infil set in this case… but it probably doesn't matter too much.

The ones in the picture were printed with some cheap PC-ABS which I had lying around. PLA or PETG should work just fine.

2025-11-18 - Initial publish.
2026-03-15 - Added 30-30, 300 Win Mag and 338 Lapua.

Printables Tags: 223; 556; reloadingtools; reloading; reloadingtray; efficient; 308