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Teresa, you may want to try the shell holder #32 you can get them here at buds, https://a.co/d/0gQlfYk7 Here is a link for one from Amazon, free shipping if you have prime. Happy Shooting

Good evening to you!! The 338 ARC used shell holder #32 (RCBS). The 338 ARC parent case is the 6.5 Grendel who's parent case is the 220 Russian. #32 can also be used on the 45 LC and 454 Casull. Hope this helps. Have a good rest of your day. 🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

For the .338 ARC (Advanced Rifle Cartridge), the shell holder matches the same case head as the 6.5 Grendel / 7.62×39 family. ✔️ Correct shell holder: RCBS: #32 Hornady: #6 Lee: #12 This is because the .338 ARC shares the same bolt face / rim dimensions as those cartridges (same family as 6mm ARC and 6.5 Grendel)

The .338 ARC uses a 6.5 Grendel / 6mm ARC shell holder (commonly an RCBS #32 or Hornady #6) due to its shared case head diameter, according to user reports and reloading references. It is designed for AR-15 platforms using a 6.5 Grendel-type bolt face. eBay eBay +4 Shell Holder Options: RCBS: #32 Hornady: #6 Lee Precision: #R2A These shell holders are used on single-stage, turret, and standard reloading presses.

Hi Teresa and welcome. The 338 ARC uses shell holder #32 (RCBS), Hornady: #6 and Lee: #12. The 338 ARC parent case is the 6.5 Grendel who's parent case is the 220 Russian. #32. Cheers, stay safe and enjoy! https://www.precisionreloading.com/cart.php#!l=RC&i=09232 --------------------------------------------------- https://www.academy.com/p/hornady-6-shell-holder ----------------------------------------------------------------- https://www.ebay.com/p/665880677

Hi Teresa, .338 ARC uses shell holder #32, as seen here >>> https://rcbs.com/reference-table/ https://www.budsgunshop.com/product_info.php/products_id/752011433/rc+shell+holder+32 , Stay safe & have a great day!