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GENERATION II EXPANDER DIES Reviews & Ratings

SINCLAIR INTERNATIONAL GENERATION II EXPANDER DIES

Large caliber die body for use with our large caliber mandrels.

Expander dies are an essential companion to neck turning tools. They enable the expander mandrel to produce the correct fir of the case neck on the neck-turning mandrel which is vital for accurate, easy neck turning. Expander dies and mandrels can also “iron out” dinged case necks, set consistent case neck size for uniform bullet tension or to “neck up” cases one caliber at time for wildcat cartridges.

Our Generation II Expander Dies completely capture the mandrel within the die so the mandrel cannot pull out. An O-ring in the die allows the mandrel to float a bit and find its own center within the case neck. All three Generation II dies are precision machined from stainless steel and the 7/8”-14 dies include the Sinclair Stainless Steel Split Lock Ring.

All expander mandrels for Sinclair Expander Bodies are sold separately: Find Mandrels here.

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5 Stars

91%

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1 Stars

Reviews Summary

Users highly appreciate the GENERATION II EXPANDER DIES for its high quality, precision, and effective neck tension control in brass resizing. Many report improved accuracy and maintain that it’s well worth the investment despite some concerns about price and occasional issues with smaller cases. Overall, it's regarded as a must-have tool for reloading enthusiasts.

What Reviewers Are Saying

Product Quality

75%

Many reviews highlight the exceptional build quality of the expander die, noting that it features robust construction and precise machining. Users express satisfaction with its effectiveness in providing accurate neck sizing and improving case neck tension, consistent with the high standards expected from Sinclair products.

Performance

70%

Reviewers frequently mention the positive impact on accuracy when using the expander die, with many reporting improvements in their shooting performance and reduced runout. The die's ability to control neck tension while resizing brass cases is widely regarded as a significant benefit, thus enhancing overall precision.

Ease of Use

60%

Customers find the expander die user-friendly, appreciating features like the O-ring that allows for some float, which aids in centering the brass during resizing. Many users share that it integrates well with other equipment and is easy to set up, making the reloading process smoother and more efficient.

Value for Money

50%

While a significant number of reviewers recognize the great quality and performance of the expander die, there are sentiments about its pricing. Some consider it a bit overpriced compared to alternatives, but many justify the cost due to the benefits and quality it delivers, making it a worthwhile investment for serious reloaders.

Compatibility Issues

40%

Several users report minor issues when using the die with smaller cases, cautioning that proper alignment is crucial to avoid damage. While many highlight its versatility across different calibers, detailing usage with both carbide and HSS mandrels, some mention the need for careful handling to achieve desired results.

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Gen II Expander Die

Good die, but could use a window.

by FREDRIC C. on August 25, 2025

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Unbreakable and necessary for 6PPC

When forming 6PPC brass from LAPUA .220 Russian's you need this! Turn this on your loadin press, slip little imperial sizing die wax to .220 brass, small press with this and you have almost ready world most accudate 6PPC brass. Cheap, simple and unbreakable. With changeable mandrel you can use this very large scale of calibers. Rubbered O-ring beetween mandrel and die body allows small movements and it's more smoother for brass.