SAC Modular Headspace Comparator Kit

The SAC Modular Headspace Comparator Kit is built for reloaders who demand absolute measurement consistency when checking headspace and seating depth. Precision-machined from 17-4 stainless steel, this system delivers durability, repeatability, and long-term accuracy that outperforms typical comparator kits.

With modular bodies and interchangeable inserts, you can measure both headspace and bullet seating depth with confidence — whether you're tuning a PRS rifle or loading ultra-magnums.

📦 What’s Included

• Short Comparator Body
• Long Comparator Body
• 4 Inserts of Your Choice
• Comparator Stand

⚠️ You must select FOUR inserts when ordering. (Custom order item — contact us on which 4 inserts you want.)

🔹 Why SAC Comparators Are Different

• 17-4 Stainless Steel Inserts — Won’t wear over time
• Precision-machined bodies with engineered insert “play” to allow proper settling during measurement
• Consistent datum contact for repeatable readings
• Designed for both headspace and bullet ogive measurement

🔸 Bullet Insert Design

Each bullet insert is:

• Machined to bore diameter (ex: 6mm insert = .237″ bore)
• Features a 3° lead angle to match common bullet ogives
• Built for consistent seating depth measurement

Insert Types

• Solid Bullet Inserts – For lathe-turned copper bullets (ex: Cutting Edge Solids with pressure rings)
• Straight Bullet Inserts – For magazine-length loads or short-ogive bullets near the case mouth

🧰 Insert Compatibility

SAC offers inserts covering a massive range of cartridges from:

• 17 Cal through 37XC
• 204 Ruger, 223 Rem, 22 Creedmoor
• 6mm family (BR, Dasher, GT, Creedmoor, ARC, etc.)
• 6.5 family (Creedmoor, PRC, Grendel, SAUM, AI variants)
• 7mm family (PRC, SAUM, Nosler, AI variants)
• .30 Cal family (308, PRC, Norma, Magnums, AI variants)
• 338 Lapua, 33XC, 37XC
• 375 Cheytac & Enabler
• Full datum gauge series (A–E)

👉 Refer to the full compatibility chart before ordering. If unsure, contact us before checkout — we’ll help select the correct insert.

⚙️ Specifications

• Material: 17-4 Stainless Steel (bodies & inserts)
• Finish: Precision machined
• Kit Savings: $55 vs individual purchase
• Custom Order: Yes

⚠️ Important Ordering Notes

• Custom build per insert selection
• Select exact cartridge / datum / bullet type
• Anodizing color may vary slightly
• Model-specific availability may vary

💬 Why We Recommend It

Measurement consistency is the foundation of precision reloading. This system eliminates variability, prevents insert wear, and provides repeatable contact geometry that serious shooters rely on.

If you’re chasing SDs, vertical dispersion reduction, or long-range consistency — this tool matters.