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
HomeProof Research

Proof Research

6.5 Creedmoor

6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance

August 21, 2017 Bill Marr 0

6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance 6.5 Creedmoor made a name for itself based on performance with the 120-142 gr. class bullets.  Unlike older cartridges such as the 308 […]

Cartridge Selection

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

August 6, 2017 Bill Marr 0

6.5 Creedmoor loads: 142 gr. and 140 gr. SMK with H4350 I hate to say it, but I guess I drank the 6.5 Creedmoor Kool-Aide.  I’ve posted quite a bit of load development for the […]

Competition

A look at how rifle barrels speed up: Measuring the increase of muzzle velocity in new barrels

July 31, 2017 Bill Marr 0

A look at how rifle barrels speed up: Measuring the increase of muzzle velocity in new barrels Seasoned shooters and barrel makers will often tell you new rifle barrels speed up.  Normally they say something […]

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Smith and Wesson Revolver front sight insert replacement

Gunsmithing
February 19, 2019 0

Remington 870 v Mossberg 500 v Mossberg 590: Comparative design notes

Shotguns
September 10, 2017 0

Remington 700 8-40 scope base conversion

Gunsmithing
October 15, 2014 0

Revic Optics PMR 428 Smart Rifle Scope Review

Optics
November 25, 2017 0

338 Lapua Magnum: Barrel Length Versus Muzzle Velocity (30-17 inches)

Barrel length
March 5, 2017 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")
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!
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
Review: Remington 700 SPS Varmint

6mm BR Load Development: 107 SMK, 95 TMK, 70 SMK, and 55 BlitzKing

Bore Tech Shotgun Jag Review

Custom Tikka T3 6.5 PRC build

EOTech Integrated Fore-End Light (IFL) Review


 

 

 

 

 

.22 barrel liner installation

April 1, 2018 0

Tuffy Security Products Heavy Duty Truck Bed Security Drawer Review

December 16, 2021 0

3-Gun Rifle Build

November 24, 2012 0

Remington 870 Police Trade-Ins: Good and Ugly!

May 24, 2015 0

Iron sight adjustment made easy

July 18, 2014 0

Installing a bead on a shotgun barrel

February 7, 2019 0

Rifle stock QD stud repair for bipod

September 22, 2019 0

Removing a fixed choke from a shotgun barrel and installing a choke tube system

February 19, 2014 0

Howa 1500 barrel removal

November 13, 2017 0

Remington 700 Rebuild: Transforming a Factory 700 AAC Rifle to a Custom Precision Rifle

November 29, 2013 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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