December 15, 2025
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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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Review: Remington 700 SPS Varmint

Precision Rifles
July 18, 2016 0

Benchrest targets on a roll, throw them in a bag and don’t be stuck without precision rifle targets again!

Accessories
August 9, 2013 0

Remington 870 barrel work: remove rifle sights, cut and crown

Gunsmithing
August 17, 2015 0

Sheared screw removal (drill and back out method)

Gunsmithing
November 17, 2018 0

Modular Driven Technologies TAC21 Chassis System Review (Initial Thoughts)

Precision Rifles
September 30, 2011 0
6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!
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")
Budget precision rifle: Customizing the Savage Axis
300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16" 300 Win Mag?
6 Creedmoor barrel length versus muzzle velocity (31 to 17 inches)
Remington Model Seven (Model 7) Versus The Model 700
Building a Custom Ruger American Rifle
Ruger American Rifle Predator 223 Review
7mm Remington Magnum (7 Rem Mag) Barrel Length Versus Velocity

Choke tube installation

Happy 240th Birthday Marines!

Cleaning brass- stainless steel media, dry media or ultrasonic cleaners?

308 Winchester load development: Sierra .308 195 gr. Tipped MatchKing (TMK) and VARGET


 

 

 

 

 

6.5 Creedmoor loads: 123 SMK and 130 TMK with VARGET

August 20, 2017 0

Remington 700 replacement triggers: 4 great options

December 16, 2017 0

6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760

October 5, 2015 0

Building a Custom Precision Rifle: Deviant 6.5×47 Lapua

July 4, 2014 0

Cerakote’s big fail? USMC returns M45A1 Close Quarters Battle Pistols to Colt

April 27, 2017 0

Pillar bedding a rifle

May 16, 2016 0

Understanding shotgun back bore

July 24, 2015 0

Custom Cut Down Over and Under Shotgun

July 30, 2020 0

Custom 1911 Project: Part 5- milling the slide for low mount sights

September 14, 2016 0

Daewoo K2, DR-200/DR-300 barrel removal

March 23, 2019 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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