April 24, 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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Remington 870 Flexitab system and parts identification

Gunsmithing
March 15, 2015 0

MagnetoSpeed Chronograph Review

Accessories
January 19, 2013 0

Machining a Glock slide for a Trijicon RMR cut

Glock
July 30, 2015 0

Cutting a recessed rifle crown

Gunsmithing
July 26, 2013 0

6.5 Creedmoor Barrel Speed: Can shorter barrels shoot faster?

Barrel length and velocity
November 25, 2019 0
223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches
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!
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
Review: Mossberg MVP Patrol 5.56mm NATO (223 Remington) and 7.62 NATO (308 Winchester)
Ruger American Rifle Predator 223 Review
Building a Custom Ruger American Rifle
Budget precision rifle: Customizing the Savage Axis
Review: Howa MINIACTION 7.62x39
M24 Sniper Rifle Review

Bolt action rifle muzzle brake installation: Installing a Surefire MB762SSAL/RE

Review: Ruger’s 10/22 Optic Ready Carbine

Review: Citadel RS-S1 Shotgun

Battle Arms Development Ambidextrous Safety Selector (BAD-ASS) Review


 

 

 

 

 

Add a detachable magazine to your Remington 700 by installing Surgeon bottom metal

September 20, 2013 0

The 270 in Africa

June 23, 2011 1
No Picture

ViperSkins upgrade for A.I.C.S

February 3, 2013 0

Building a Custom 6GT Rifle

July 31, 2021 0

Remington 700 upgrades

December 26, 2017 0

USMC M40A5 Build- Part 3: Receiver Truing

June 13, 2015 0

Building a custom Howa 1500 in 6.5 Creedmoor

November 1, 2017 0

Porting a shotgun barrel with a drill

January 17, 2014 0

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

January 4, 2016 0

Grizzly 4003G Gunsmith’s lathe chuck issue resolved

March 3, 2015 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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