The Hornady Lock-N-Load® Bullet Comparator Insert #30 (Item 830) is a precision-machined aluminium reloading accessory designed to measure cartridge Base-to-Ogive (BTO) length. Standard overall length measurements taken from the bullet tip can fluctuate by up to .025" (0.635 mm) due to minor variations in meplat or polymer tip manufacturing. By indexing directly against the projectile's curved ogive rather than the tip, this comparator insert eliminates tip-induced measurement errors to help handloaders maintain uniform bullet seating depth across ammunition batches.

Key Features

• Ogive-Referenced Measurement: Bypasses projectile tip irregularities by contacting the .308" datum surface, removing up to .025" (0.635 mm) of tip-to-tip variation.
• BTO Seating Consistency: Enables handloaders to monitor exact seating depth and batch uniformity using standard dial or digital callipers.
• Bullet Jump Verification: Pairs with the Hornady Lock-N-Load® Overall Length Gauge to measure precise free-travel clearance relative to a rifle's rifling lands.
• System Integration: Precision-machined aluminium construction attaches directly into the Hornady Lock-N-Load® Comparator Body via thumbscrew or setscrew collar.
• Non-Powered Workshop Tooling: Operates mechanically without batteries or mains power, making it fully unrestricted for standard reloading setups across Australia.

Specifications

• Model / MPN: 830
• Calibre Compatibility: .308" bore diameter (nominal .30 calibre, 7.62mm, and 8mm projectiles)
• Weight: Under 15 g (packaged weight approximately 20–30 g)
• Material: Machined aluminium
• Required Tooling: Hornady Lock-N-Load® Bullet Comparator Body (Item #B2000) and standard dial or digital callipers

Who is the Hornady 830 Lock N Load Bullet Comparator Insert For .308 Caliber for?

• Precision Handloaders: Needs to maintain exact base-to-ogive seating consistency across batches of .308 Winchester or 7.62x51mm ammunition by indexing projectiles along their specific .308 inch calibre bore diameter surface using this reloading bullet comparator insert.
• Competitive Target Shooters: Requires a lightweight, under 15 g comparator insert to pair with an O.A.L. gauge on their callipers to precisely calculate bullet jump and distance to the rifling lands for .308" match rifles.

Less suitable for: Measuring projectiles outside the nominal .308", 7.62mm, or 8mm diameter envelope (which require dedicated, calibre-specific comparator inserts), or for checking cartridge case headspace (which requires a dedicated headspace bushing tool).