July 1, 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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Why 308? The case for the 308 Winchester

Cartridge Selection
December 3, 2017 0

Review: Mossberg 590 Shockwave vs. the Remington Model 870 TAC-14

Reviews
June 25, 2017 0

Remington 700 sheared screw removal

Gunsmithing
December 1, 2019 0

TAC21 Review (TAC21/TAC21LA)

New
August 2, 2012 0

Glock firing pin channel removal and replacement

Glock
September 1, 2015 0
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
223 Remington/ 5.56mm NATO barrel length and velocity: 26 inches to 6 inches
Howa 1500 barreled action review: Howa 1500 versus Remington 700
Budget precision rifle: Customizing the Savage Axis
Ruger American Rifle Predator 223 Review
16.5 Inch 308 Winchester Precision Rifle: Summary of a Short Rifle
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
Remington Model Seven (Model 7) Versus The Model 700

Remington 700 8-40 scope base conversion

Do rifle crowns matter? Does a crown affect accuracy? I find out with the help of my grinder…

Installing a bead on a shotgun barrel

Tactical Shotgun Build: Back Boring a Barrel and Lengthening a Forcing Cone to Increase Performance


 

 

 

 

 

Closing screw holes on a shotgun receiver with a TIG welder

June 13, 2013 0

The scout rifle: a one gun solution?

June 11, 2017 0

Building a 300 Winchester Magnum Precision Rifle

September 18, 2014 0

Building a custom 300 Blackout (BLK) Precision Rifle

April 11, 2016 0

Custom 1911 Project: Part 2-undercut trigger guard

September 1, 2016 0

Cutting a recessed rifle crown

July 26, 2013 0

Remington 700 versus Savage 10/110: Comparative design notes

March 9, 2016 0

Fixing a Custom 260 Remington Bolt Action Rifle

November 26, 2014 0

Building (machining) an AR-15/M16 M4 barrel from a blank

May 13, 2014 0

AR-10/ 308 AR Barrel nut removal

September 2, 2018 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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