May 21, 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
HomeCartridge Selection

Cartridge Selection

6.5 Creedmoor

6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!

February 22, 2016 Bill Marr 0

Since its introduction by Hornady in 2007, the 6.5 Creedmoor (sometimes shortened to Creed) has established a strong foothold in the US rifle market.  The 6.5 Creedmoor balances the excellent external ballistics of .264″ diameter bullets […]

Barrel length

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

February 1, 2016 Bill Marr 0

I woke up early that morning.  It was only a few days after a historic blizzard passed through my state.  Stir crazy, I couldn’t wait to get outside.  The chill from my snow covered feet […]

6.5 Creedmoor

6.5 Creedmoor 136 grain Scenar-L OTM Load Development, H4350

August 1, 2015 Bill Marr 0

I’ve taken a few trips to the range developing a load for my 22″ barrel 6.5 Creedmoor precision rifle. The rifle is built with the following components from Brownells: Surgeon 591 action Bartlein 6.5mm 1:8 […]

Barrel length

7mm Remington Magnum (7 Rem Mag) Barrel Length Versus Velocity

April 7, 2015 Bill Marr 0

7mm Remington Magnum (7 Rem Mag) Barrel Length Versus Velocity Since its introduction in 1962, the 7mm Remington Magnum (7 Rem Mag) has developed a strong following, becoming the most popular metric hunting cartridge in […]

Cartridge Selection

6.5 Grendel Review: 18″ Special Purpose Rifle

February 1, 2015 Bill Marr 0

The 6.5 Grendel was created as a 200-800 yard cartridge to fit into a standard AR-15 magazine.  Based on the 220 Russian cartridge (the parent case utilized for the 7.62x39mm, 5.45x39mm and the 6PPC), the 6.5 […]

Cartridge Selection

British SS109 5.56mm Ammunition: Cartridge, Caliber 5.56mm, Ball, L2A2 (United Kingdom)

January 26, 2015 Bill Marr 0

British SS109 5.56mm Ammunition: Cartridge, Caliber 5.56mm, Ball, L2A2 (United Kingdom) Under STANAG 4172 (standardization agreement)5.56x45mm NATO is the standard intermediate cartridge chambering for NATO forces.  SS109 NATO (known as M855 in the United States) […]

Barrel length

308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ

January 24, 2015 Bill Marr 0

Introduction I cut back a 28″ barrel 308 Winchester one inch at a time, to 16.5″, and recorded velocity data for four different cartridges.  The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length […]

Barrel length

7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ

January 24, 2015 Bill Marr 0

Introduction I cut back a 28″ barrel 308 Winchester one inch at a time, to 16.5″, and recorded velocity data for four different cartridges.  The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length […]

Barrel length

308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP

January 24, 2015 Bill Marr 0

Introduction I cut back a 28″ barrel 308 Winchester one inch at a time, to 16.5″, and recorded velocity data for four different cartridges.  The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length […]

Barrel length

308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point

January 24, 2015 Bill Marr 0

Introduction I cut back a 28″ barrel 308 Winchester one inch at a time, to 16.5″, and recorded velocity data for four different cartridges.  The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length […]

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6.5 Creedmoor loads: 142 gr. and 140 gr. SMK with H4350

Cartridge Selection
August 6, 2017 0

Fulton Armory M14 receiver

Rifles
March 25, 2018 0

Indoor Optical Training Aid (I.O.T.A.) Review: Dry practice with a scoped rifle

Competition
August 25, 2016 0

Changing the rear sight blade on a Smith and Wesson revolver

Gunsmithing
March 21, 2019 0

Elcan SpecterDR 1-4x Dual Field-of-View Optical Sight Review

Optics
December 19, 2014 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")
Howa 1500 Review
Ruger American Rifle Predator 223 Review
M24 Sniper Rifle Review
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
Budget precision rifle: Customizing the Savage Axis
USMC M40A5 Build- Part 1: Gathering the Parts
308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun?

Glock firing pin channel removal and replacement

Turnbull Restoration and Manufacturing on “How it’s Made”

6.5 Creedmoor 123 Sierra MatchKing (SMK) HPBT load development with H4350 and Varget

Vang Comp Systems Ghost Ring Sight Installation


 

 

 

 

 

Bolton Gas Block Review

February 16, 2013 0

Marlin 336 Straight Stock Conversion

November 18, 2012 0

Turnbull Restoration and Manufacturing on “How it’s Made”

March 6, 2015 0

MDT LSS XL shines during backcountry hunt in New Mexico

January 14, 2019 0

Lithgow Arms Crossover LA101 Rimfire review

April 8, 2018 0

Building a custom 260 Remington precision rifle

November 14, 2013 0

Remington Model 4, 742, 7400 disassembly notes

December 15, 2019 0

AR-180 Magazines: Modifying AR-15/M16 M4 magazines to fit an AR-180

July 21, 2019 0

Worst case scenario: pin and screw removal-EDM machining in gunsmithing

October 2, 2018 0

Customizing the 1911: machining a golf ball front strap

October 11, 2016 0

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  • Removing stripped and sheared screws from a rifle
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