Photo of O.A.L. Gauges

Product Line

The Lock-N-Load® O.A.L. Gauge is universally acclaimed as the most accurate, easy-to-use and reliable method of regulating seating depth and the resulting "jump" to the rifling.

Straight Model

Item #C1000

For all bolt-action and single-shot firearms, or any firearm with straight-line access to the chamber. This model is preferred, as it is most precise and user friendly.

Curved Model

Item #C1550

For all autoloader, lever-action, or pump-action rifles. Also fits all bolt-action and single-shot firearms. Inserts into chamber through ejection port. Not compatible with Adapter "D" or short-bodied cases.

Achieve precise bullet seating depth.

To use the Lock-N-Load® O.A.L. Gauge, you will need a Modified Case (sold separately) to fit your firearm's chamber and thread it onto the gauge. These specially prepared modified cases are threaded at the case-head and have a .002" oversized neck to accept the same bullets you intend to load.

This is critical, as the Lock-N-Load® O.A.L. Gauge dimensions obtained will be accurate to .001". These results cannot be attained with competitive products, which use a simulated bullet with an arbitrary shape.

Lock-N-Load® Modified Cases

Lock-N-Load® Modified Cases are readily available to fit most popular rifle chambers. All are manufactured to SAAMI specs.

Modified Case and Adapter D for 22 Hornet Item #D1202
Modified Case and Adapter D for 17 Hornet Item #A17H

"A" Series

Item #
Description
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17 Remington
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218 Bee
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221 Remington Fireball
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222 Remington
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223 Remington
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222 Remington Magnum
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22-250 Remington
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220 Swift
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6mm Bench Rest Remington
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243 Winchester
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224 Valkyrie
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6mm ARC
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6mm Remington
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6mm Creedmoor
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250 Savage
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257 Roberts
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25-06 Remington
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6.5 Grendel
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260 Remington
Item #
Description
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6.5 Creedmoor
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264 Winchester Magnum
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6.8 Remington SPC
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270 Winchester
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7mm Bench Rest Remington
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7 X 57mm Mauser
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7mm-08 Remington
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280 Remington
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280 Ackley Improved
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7mm Remington Magnum
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300 Blackout
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30-30 Winchester
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308 Marlin Express
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308 Winchester
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300 H & H Magnum
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30-06 Springfield
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300 Ruger Compact Magnum
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300 Winchester Magnum
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300 Weatherby Magnum
Item #
Description
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7.62 X 39mm (308/311)
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303 British
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32 Winchester Special
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8 X 57mm Mauser
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8mm Remington Magnum
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338 Ruger Compact Magnum
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338 Winchester Magnum
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340 Weatherby Magnum
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340 Weatherby Magnum
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35 Whelen
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35 Remington
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350 Remington Magnum
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350 Legend
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9.3 X 62
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375 H & H Magnum
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450 Bushmaster
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45-70 Government

"B" Series

Item #
Description
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204 Ruger
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22 Creedmoor
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223 Winchester Super Short Magnum
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6mm PPC SAKO
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240 Weatherby Magnum
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6mm GT
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243 Winchester Super Short Magnum
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25 Winchester Super Short Magnum
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257 Weatherby Magnum
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6.5 X 55mm Swedish
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6.5mm-284
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6.5mm PRC
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26 Nosler
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7 X 64mm Brenneke
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7mm Remington Short Action Ultra Magnum
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7mm PRC
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7mm Winchester Short Magnum
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7mm Weatherby Magnum
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28 Nosler
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7mm Remington Ultra Magnum
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300 Savage
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300 Remington Short Action Ultra Magnum
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300 Winchester Short Magnum
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30 Nosler
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300 PRC
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300 Remington Ultra Magnum
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33 Nosler
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338 Remington Ultra Magnum
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358 Winchester

"C" Series

Item #
Description
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6mm PPC .261
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30-378 Weatherby Magnum
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338 Lapua Magnum
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9.3 X 74R
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375 Ruger
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450/400 Nitro Express 3
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450/400 Nitro Express 3¼
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405 Winchester
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416 Rigby
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416 Ruger
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450 Nitro Express 3¼
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458 Winchester Magnum
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458 Lott
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470 Nitro Express 3¼
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500 Nitro Express 3
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50 BMG


* = Limited quantities available.

Custom Case Modification

Any of your brass, including all wildcat sizes, can be custom modified at our factory for use with either gauge. Simply send us two fired cases by mail for quick turnaround.

Please include contact information, two fired pieces of brass (not deprimed or resized, in case there are issues creating the modified case) as well as a check or money order for $20.00 for customers inside the USA. Please make checks payable to Hornady Manufacturing. We ask that you please use FedEx, UPS, or other direct shipping service. Using USPS may result in item returned to sender.

Mail to:

Hornady Manufacturing
Attn: Modified Cases
108 S. Apollo St.
Alda, NE 68810

*Please note we can only accommodate requests for those customers inside the USA, due to licensing regulations for cartridge cases.

For a stuck case in a sizing die, please include a $5.00 check for the return postage, made out to Hornady Manufacturing.

NOTE: Dial Caliper and OAL Gauge not included

C1000 C1550 D1202