Brass sizing Big Horn Origin

[Jay Harrison]

I did some trading and now own a Proof Rifle with Big Horn Origin action. This is my first action with control round feed/non spring ejector/interchangeable bolt face. My question is about sizing my fired brass. My other actions I remove ejector and firing pin assembly then start the measuring/sizing process. When I remove firing pin assembly from Big Horn bolt the pin falls out that holds the interchangeable bolt head/face in place. What is the proper sizing method/process with this type of bolt? I was considering putting some grease on the bolt head retaining pin to help hold it in place but I'm not in love with that idea. Thanks in advance for the help!

 

[Gargoyle]

I load for two CRF rifles. I've only measured the fired length, set my die to bump the shoulder .002-.003" and let fly. I guess I haven't wrapped my head around the idea of taking parts of a bolt to do a measurement only to reinstall the parts and put the gun into a different state from which it fires. I would think whatever is influencing the brass when you fire it is how you would want to keep that baseline. So, I will be following this.

 

[Jay Harrison]

Thank you both for your replies. I am an idiot, apparently I dropped that spring washer when I disassembled to clean and examine. Now I know and won't make that mistake again. To be honest though some of my biggest learning experiences has come from mistakes. Thanks again!

 

[Gargoyle]

Thank you both for your replies. I am an idiot, apparently I dropped that spring washer when I disassembled to clean and examine. Now I know and won't make that mistake again. To be honest though some of my biggest learning experiences has come from mistakes. Thanks again!

The last time I didn't replace a washer on a gun was my Thompson Hawken muzzleloader. It acted as a spacer for the hammer to strike squarely on the primer nipple. I discovered it's disappearance after the hammer fell onto the side of the receiver...when attempting to shoot the biggest racked buck I've ever personally seen in the woods. Like a "Candlestick Chandelier" walking through the woods...

 

[fkimble@charter.net]

I did some trading and now own a Proof Rifle with Big Horn Origin action. This is my first action with control round feed/non spring ejector/interchangeable bolt face. My question is about sizing my fired brass. My other actions I remove ejector and firing pin assembly then start the measuring/sizing process. When I remove firing pin assembly from Big Horn bolt the pin falls out that holds the interchangeable bolt head/face in place. What is the proper sizing method/process with this type of bolt? I was considering putting some grease on the bolt head retaining pin to help hold it in place but I'm not in love with that idea. Thanks in advance for the help!

With a "non spring ejector" you don;t need to remover anything.

Frank

 

[Liven The Dream]

Measure the Fired Brass , bump shoulder .002 trim load and be ready .

 

[jackieschmidt]

Measure the Fired Brass , bump shoulder .002 trim load and be ready .

I agree. Actual measurements are far more reliable than the “feel” methods.

 

[Richard Jones]

I made a jig for my Origin actions that works great for finding lands, headspace, etc.