Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels & Ballistics

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Copper Fouling and POI/Accuracy

 
LinkBack Thread Tools Display Modes
  #1  
Old 06-24-2013, 08:51 PM
Silver Member
 
Join Date: Jan 2013
Location: Southeast Kansas
Posts: 227
Copper Fouling and POI/Accuracy

Ok so I am still relatively new to LRH, and obviously have much to learn. I have recently had a semi-custom rifle built, chambered in .260 with a Benchmark barrel, if it matters. I was wondering:

1) Does copper fouling change your point of impact/zero? like if there is some fouling and i use some Bore Tech CU2 and scrub it all off, is it going to change my zero?

2) Does copper fouling increase accuracy/consistency, does it hinder it, or does it help it and then eventually hurt it if there begins to be too much?

3) I know all this can vary from barrel to barrel, and i was wondering if anyone has had any experience with Benchmark's barrels (Carbon Steel Barrels)?

Thank you ahead of time for your input.
Reply With Quote
  #2  
Old 06-25-2013, 12:30 AM
Gold Member
 
Join Date: Apr 2009
Location: Carrollton, Ohio
Posts: 601
Re: Copper Fouling and POI/Accuracy


__________________
"If you love wealth more than liberty, the tranquility of servitude better than the animating contest of freedom, depart from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains rest lightly upon you and may posterity forget that you were our countrymen."-- Samuel Adams
Reply With Quote
  #3  
Old 06-25-2013, 06:58 AM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,337
Re: Copper Fouling and POI/Accuracy

A change to fouling, more/less/type, affects zero(initial POI).
Copper buildup in the bore is bad for accuracy(unless your accuracy is based on it).
Oil left in a bore has to be burned out before stable fouling sets.

2 approaches to dealing with this:
Clean a bore as infrequently as possible.
Clean a bore after every use, and prefoul just before another use.

I was taught to put a gun away cleaner than it was pulled.
With this, my guns are maintained in better than brand new condition.
I hand prefoul clean dry bores before putting them away.
Reply With Quote
  #4  
Old 06-25-2013, 08:03 AM
Silver Member
 
Join Date: Jan 2013
Location: Southeast Kansas
Posts: 227
Re: Copper Fouling and POI/Accuracy

Good stuff to know, but please excuse my ignorance... What is "hand pre-fouling"? After I clean my bore I always shoot 2-3 shots to carbon foul it, is this the same thing or something else?
Reply With Quote
  #5  
Old 06-25-2013, 01:14 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,337
Re: Copper Fouling and POI/Accuracy

I missed the context of your original question. That you intended only to go after copper while leaving carbon in the bore & would this affect zero.
This I don't know.
Reply With Quote
  #6  
Old 06-25-2013, 06:22 PM
Platinum Member
 
Join Date: Jan 2008
Location: Northeast
Posts: 2,381
Re: Copper Fouling and POI/Accuracy

I think the copper or carbon effect on accuracy and POI is largely dependent on the barrel, load, and how you condition that barrel prior to shooting for hunting or score purposes. I try to start with a well cleaned barrel, free of copper or carbon and treated with a lubricant or barrel conditioner. This is the condition for storage. I then determine the number of shots to stabilize the POI. My accuracy standard has been established under this stable POI. Once the barrel is in this fouled condition, I check the POI under cold and warm bore conditions. I then determine how many shots I can shoot before POI changes, or accuracy degrades. This will determine when the rifle gets cleaned. When the rifle is used again I foul the barrel with number of shots required to reach my POI and accuracy standard. For hunting I am more concerned with cold bore, for competition, warm/hot bore. The perfect situation is hot or cold, no change. I have two Rem 700 5R Milpecs in 308 that condition in 4 rounds, hold POI, shoot sub .5MOA, hot or cold, and will hold this to 200 rounds. Not sure how much above 200 shots without change they will go because I stop at 200 or less and clean. I think the 5R rifling has to do with this. My two primary LRH hunting rifles, a 6.5x284 Cooper, and a 300WM Rem 700 Milspec, give same POI warm/cold but have only tested for 40 shots, which they hold accuracy and POI.
__________________

"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes



All times are GMT -5. The time now is 01:50 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC