Built around RCBS’s proven Full-Length Sizer and Seater Die combination, the RCBS 8x57mm Mauser Full-Length Die Set equips 8x57mm Mauser reloaders with everything needed to resize and seat in one two-die set (part no. 15901). This set is intended for bottleneck rifle brass, and each die is machined specifically for the 8x57mm Mauser cartridge so there’s no cross-caliber guesswork at the bench. Reloaders get a Full-Length Sizer with an integrated expander-decapping unit plus a Seater Die with a bullet seater plug, both built to RCBS’s standard tolerances.

Key Specifications

• Chambered specifically for 8x57mm Mauser, so every die in the set is cut to that cartridge’s exact dimensions.
• Set is built as a two-die, full-length configuration, pairing one sizer die with one seater die.
• Sized for bottleneck rifle brass rather than the straight-wall cases a pistol die set handles.
• The Full-Length Sizer Die resizes fired brass back down to SAAMI minimum cartridge dimensions for reliable chambering in any rifle.
• The same sizing pass also de-primes the fired case, knocking out the spent primer as the body is resized.
• An integrated expander-decapping unit expands the case neck back open in the same stroke, prepping it to accept a new bullet.
• The sizer die is vented to relieve trapped air and excess case lube so cases don’t dent or stick during resizing.
• Headspace is held to minimum tolerances during full-length sizing so case body length stays consistent load after load.
• The Seater Die has a built-in roll crimper, so it seats the bullet and applies a secure crimp in the same step.
• Dies are steel construction (not carbide), so a case lube step is part of the normal sizing routine.

Frequently Asked Questions

Is this die set carbide? No. This is a steel die set, so cases need to be lubed before sizing, standard practice for bottleneck rifle brass.

How many dies are included? Two: a Full-Length Sizer Die with expander-decapping unit and a Seater Die with bullet seater plug.

Will this keep my case headspace consistent? Yes. The sizer is built to hold headspace to minimum tolerances during full-length sizing, so case body length stays consistent between loadings.

Buy the RCBS 8x57mm Mauser Full-Length Die Set

Order the RCBS 8x57mm Mauser Full-Length Die Set through RCBS‘s reloading dies lineup, ships direct from our Lubbock, Texas gun shop.