June 17, 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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Cut and Crown a Winchester 94 30-30

Gunsmithing
February 28, 2023 0

Rifle stock or chassis?

Accessories
November 16, 2015 0

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

6.5 Creedmoor
August 1, 2015 0

Jewell trigger installation on Winchester 70/FN Special Police

Gunsmithing
November 24, 2019 0

Howa 1500 barrel removal

Gunsmithing
November 13, 2017 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!
Budget precision rifle: Customizing the Savage Axis
Ruger American Rifle Predator 223 Review
223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches
Howa 1500 Review
338 Lapua Magnum: Barrel Length Versus Muzzle Velocity (30-17 inches)
Completing an 80% 10/22 Select Fire LLC RAZOR Semiautomatic Receiver
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
USMC M40A5 Build- Part 1: Gathering the Parts

60 years too early? Winchester’s fiber wrapped Win-Lite shotgun barrels

Henry Long Ranger review

224 VALKYRIE- Effect of barrel length on velocity

Remington Model Seven Actions are available!


 

 

 

 

 

Texturing a fiberglass stock

February 1, 2017 0

AR15 Barrel Threading

December 26, 2012 0

Custom 1911 Project: Part 6- flat top and chain link top of slide

September 19, 2016 0

Forster CO-AX reloading press: REVIEW- Is it the best press for precision rifle?

March 12, 2017 0

Short Barrel 338 Lapua Magnum Load Development Results

September 26, 2014 0

Rebarreling a Winchester Model 70

February 15, 2016 0

Refreshing a poorly machined Remington 700 action

July 19, 2014 0

Ruger 10/22 custom barrel work: Cut, crown, thread and fill sight dovetail

August 24, 2015 0

Remington Model 4, 742, 7400 disassembly notes

December 15, 2019 0

Chamber Reamers

April 5, 2015 0

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