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Expander Die Body 17-338 Caliber
Expander Die Body 17-338 Caliber
Expander Die Body 17-338 Caliber
Expander Die Body 17-338 Caliber
Expander Die Body 17-338 Caliber
Expander Die Body 17-338 Caliber
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SINCLAIR INTERNATIONAL - Expander Die Body 17-338 Caliber

32 Reviews
Expander Die Body 17-338 Caliber
Brownells #
749011715
MFR #
STD 7/8-14 EXPANDER DIE
UPC
050806111158
$61.99
Coupon Code
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Specifications
Caliber (Maximum):
338 Caliber
Caliber (Minimum):
17 Caliber
Caliber:
17 Caliber
Material:
Stainless Steel
Quantity:
1
Color:
Silver
Model Number:
7/8-14" Die / 17 - 338 Caliber
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What is the SINCLAIR INTERNATIONAL - Expander Die Body 17-338 Caliber?

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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GENERATION II EXPANDER DIES REVIEWS

4.8
32 Reviews
5 Stars
91%
4 Stars
6%
3 Stars
0%
2 Stars
0%
1 Stars
3%
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.
5
Simple solution
I'm not sure why I took so long to switch from expander ball to mandrel to set neck tension. The Sinclair solution is simple, fast and effective. I just ordered my 4th mandrel now.
Would you recommend this? Yes, I would recommend to a friend
by KEVIN NEUMANN on June 16, 2026
Verified Purchase
Was this review helpful? 0
5
Thanks
Been waiting for some time for these to come back in stock.Love the units. I use them for .223, 6.5 and .308. Nice not to have to change the mandrel and reset each time.
by ARTHUR J BANKS on August 24, 2025
Verified Purchase
Was this review helpful? 1
5
Die for carbide mandrel
Everything i read about the carbide mandrel being the Mercedes Benz of mandrels is true,no lube required. Use on new brass to set neck tension,remove out of round on spent brass,a must have. Thanks to all at Brownells!
Would you recommend this? Yes, I would recommend to a friend
by CLAY TOMLINSON on January 26, 2025
Verified Purchase
Was this review helpful? 0
5
Sinclair is always good
Well made good Sinclair quality. At a reasonable price.
Would you recommend this? Yes, I would recommend to a friend
by Shawn Rupp on December 06, 2024
Verified Purchase
Was this review helpful? 1
5
Great expander
An effective process to control neck runout. It's an extra step, but it is worth it.
by KENNETH MYERS on March 25, 2024
Verified Purchase
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View All 32 Reviews
Customer Questions
28 Questions