Our Neck Expanding Mandrels are 3/8 diameter and are designed to fit both the 21^st Century Shooting and Sinclair Expander Dies. Our mandrels are longer than other expanding mandrels and feature a special dual taper which expands both on the up and down stroke of the press to more uniformly expand and straighten case necks.

Expanding Mandrels are available in the following calibers:

17, 20, 22, 6mm, 25, 6.5mm, 270, 7mm, 30 and 338

These mandrels are perfectly matched to suit our turning mandrels, they are sized to allow for the spring back in the brass and to maintain a snug fit on the turning mandrell, allowing consistent neck tension and uniformity during the turning process.

Also available in our Neck-Up mandrels for 22cal – 6mm and 6mm – 30cal. Perfect for necking 220 Russian up to 6mm for PPC and 6BR up to 30 caliber for 30BR.

If you are doing a lot of turning and why not check out our carbide turning mandrels - they maintain dimensional accuracy over a wide temperature range.

Larger Calibres

Due to low volumes in Large Calibres any size above 338 are not commonly held in stock. If need one of these please let use know and we will order these in for you.

Mandrel Markings

Our mandrels are marked as follows, the numbers represent the calibre:

17 = .177

22 = .224

24 = .243 ( 6mm)

25 = .257

26 = .264 (6.5mm)

27 = .270

28 = .284 (7mm)

30 = .308 (7.62mm)

33 = .338

35 = .35cal

36 = 36 Cal

37 = 375 Cal

40 = 408 Cal

41 = 416 Cal

50 = 50 Cal

Stainless Steel

N30 - N = Neck turning, 30 is calibre, so an N30 is a Neck Turning 30 Calibre

X26 - X = Expanding, 26 is calibre, so an X26, is an expanding .264 (or 6.5mm) 

X24X - is a special Neck-Up mandrels to go from 22cal to 6mm in one step, Perfect for necking 220 Russian up to 6mm for PPC

X30X is a special Neck-Up mandrels to go from 6mm to 30cal in one step. Perfect for necking 6BR up to 30 calibres for 30BR.

Carbide

C24 - C = Carbide Turning, 24 is the calibre, so a C24 is a carbide turning .243 (or 6mm) mandrel.

CX24X - Carbide Expanding, 24 from 22 to 24 in one step.

CX22 - CX = Carbide expanding, 22 is the calibre (.224)