February 13, 2026
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Bill Marr's journal of shooting, reloading and gunsmithing

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What's new?
  • [ 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
Home300 BLK

300 BLK

300 BLK

300 BLK accuracy problems? Maybe it isn’t you…

August 17, 2016 Bill Marr 0

The ability to shoot 30 caliber bullets from a standard AR-15 M16/M4 style rifle by simply changing the barrel and ammunition has made the 300 AAC Blackout (300 BLK) a popular choice for AR shooters looking […]

300 BLK

300 BLK load development: 125, 135, 175 and 220 SMK with H110 and IMR 4227

June 1, 2016 Bill Marr 0

The 300 AAC Blackout (300 BLK) is a popular alternative cartridge in the AR-15/M16 M4 (AR) community.  Known for its ability to deliver heavy subsonic bullets for standard AR magazines while cycling the action in suppressed applications, […]

300 BLK

Building a custom 300 Blackout (BLK) Precision Rifle

April 11, 2016 Bill Marr 0

Since its approval by SAMMI in 2011, the 300 AAC Blackout (abbreviated 300 BLK) has been a popular choice with shooters.  Often recognized as the go to choice for suppressed applications with heavy subsonic loads; […]

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Reloading 101: Measuring group size and converting to MOA

Precision Rifles
August 11, 2016 0

Brownells AR-15 10 Round Magazines

Accessories
January 11, 2015 0

AR15/ M4 Upper Receiver Build

Carbine Basics
November 4, 2012 0

Accuracy testing a 16″ carbine: Daniel Defense Hammer Forged Barrel

Carbine Basics
July 21, 2015 0

Beretta M1951 mystery- cutting our way to the truth

Gunsmithing
December 4, 2020 0
308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28" to 16.5")
6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!
223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches
Ruger American Rifle Predator 223 Review
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
Remington Model 4, 742, 7400 disassembly notes
Sig Sauer MPX Review
Review: Mossberg MVP Patrol 5.56mm NATO (223 Remington) and 7.62 NATO (308 Winchester)
308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun?
Howa 1500 Review

Countouring a Rifle Barrel Blank

Building a USMC M40A3: Cloning the Marine Corps Sniper Rifle from 1999-2009

Fluted Remington 700 Bolts

7 Tactical shotgun upgrades


 

 

 

 

 

Choke tube installation

February 2, 2013 0

Custom 1911 Project: Part 7- machining ball cuts on a 1911 slide

September 26, 2016 0

Modular Driven Technologies TAC21 Chassis System Review (Initial Thoughts)

September 30, 2011 0

Remington 700 upgrades

December 26, 2017 0

22 Magnum barrel length and velocity

March 11, 2018 0

Removing stuck choke tubes

March 31, 2020 0

Building a custom 7mm Rem Mag Hunting Rifle-PART 2

July 31, 2022 0

Chinese Type 53 Carbine (Mosin) sight removal

September 2, 2018 0

Sheared screw removal (drill and back out method)

November 17, 2018 0

AR15 Rebuild Build: Updating the Musket

September 12, 2011 0

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Recent Posts
  • 782 Custom Gunworks “HUNDO” Loading Block
  • How do rifle suppressors affect muzzle velocity?
  • The A-Team Mini-14? Customizing a Ruger Mini-14
  • Removing stripped and sheared screws from a rifle
  • Cut and Crown a Winchester 94 30-30
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