RCBS Full Length 3-Die Set, .375 Winchester (RCBS part no. 20604) is a complete die set built for handloaders working with straight-wall 375 Winchester brass. RCBS designed this 2-die set to size, expand, and roll crimps in dedicated stations, so a reloader can take fired brass from resizing through a finished, crimped round without swapping in outside tools. It ships as a matched set rather than individual dies, which matters for straight-wall cartridges where sizing, expanding, and crimping each call for a purpose-built die.

Key Specifications

• 375 Winchester is the cartridge this set is machined for, sizing and crimping brass for that chambering only.
• Straight-wall design built specifically for straight-wall cartridge cases rather than bottleneck rifle brass.
• Sizing/expanding die sizes the case, deprimes it, expands it to bullet diameter, and flares the case mouth for bullet feeding, all in one die.
• Lubed cases required since the sizer die is steel, not carbide, so cases need case lube before sizing.
• Seater die rolls crimp seats the bullet and applies a roll crimp in the same station.
• 2-die set puts sizing/expanding and seating/crimping in 2 dedicated dies rather than a universal die.
• Full-length classification resizes the full case body, not just the neck, which matters for straight-wall brass that headspaces off the case mouth.
• Boxed as a kit so the complete set ships together instead of requiring separate die purchases to assemble.

Frequently Asked Questions

Does this die set require case lube? Yes — the sizing die is steel, not carbide, so cases need to be lubed before sizing.

What kind of crimp does this set apply? The seater die applies a roll crimp as it seats the bullet, in the same station.

Buy the RCBS Full Length 3-Die Set, .375 Winchester

Order RCBS Full Length 3-Die Set, .375 Winchester from our Lubbock, Texas gun shop for fast, insured shipping and browse the rest of our RCBS reloading dies selection while you’re setting up for 375 Winchester.