May 23, 2025
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Bill Marr's journal of shooting, reloading and gunsmithing

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  • [ January 26, 2025 ] 782 Custom Gunworks “HUNDO” Loading Block Editorial
  • [ January 26, 2025 ] How do rifle suppressors affect muzzle velocity? Precision Rifles
  • [ May 31, 2023 ] The A-Team Mini-14? Customizing a Ruger Mini-14 A-Team
  • [ April 30, 2023 ] Removing stripped and sheared screws from a rifle Gunsmithing
  • [ February 28, 2023 ] Cut and Crown a Winchester 94 30-30 Gunsmithing
Homeconcentricity gauge

concentricity gauge

7.62x39

Ammunition concentricity and accuracy: Testing the effect of run-out on precision

February 8, 2016 Bill Marr 0

What is cartridge concentricity?  Cartridge concentricity is how straight a cartridge is along it’s center axis.  The straighter the round, the lower the concentricity. Ammunition concentricity is measured using a method called Total Indicator Runout (T.I.R.)- sometimes […]

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Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions

Air rifles
September 30, 2022 0

USMC M40A5 Build-Part 2: Lug slotting the receiver

Gunsmithing
April 19, 2015 0

308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun?

Barrel length
February 1, 2016 0

Building a Custom 308 Precision Chassis Rifle- PART 1, Barrel removal, action blueprinting

308 Winchester
January 23, 2022 0

Sig Sauer MPX Review

Pistols
May 21, 2022 0
223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches
6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!
308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28" to 16.5")
223 Ackley Improved (223AI) loads and review: A better 223?
308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun?
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
M24 Sniper Rifle Review
Budget precision rifle: Customizing the Savage Axis
7.62x39 mm Russian: Effect of barrel length on muzzle velocity
243 Winchester- Effect of barrel length on velocity

Mosin Nagant Bolt Handle Modification

6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760

Custom Cut Down Over and Under Shotgun

Bushmaster ACR Review


 

 

 

 

 

Cut and crown a rifle barrel without a lathe (11 degree target crown)

August 22, 2012 0

Short Barrel 338 Lapua Magnum Load Development Results

September 26, 2014 0

DRD Tactical AR-15/M16 Quick Takedown Build Kit

July 19, 2014 0

Shooting the FBI Pistol Qualification Course

January 22, 2015 0

Installing a Mini Red Dot Mounting Plate on a Smith and Wesson Revolver (586/686)

December 15, 2021 0

Scattergun Technologies Track-Lock II Ghost Ring Sight Installation on a Remington 870 Police Magnum

July 14, 2012 0

Filling a Dovetail Sight Notch with a Blank

October 21, 2012 0

Remington 700 8-40 scope base conversion

October 15, 2014 0

Build a Remington 700 bolt disassembly tool

March 5, 2015 0

Badger Ordnance FTE Brake Installation

December 1, 2013 0

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