Long Range Hunting Online Magazine


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


Reply

Pressure test ladder - how do I do it

 
LinkBack Thread Tools Display Modes
  #1  
Old 08-23-2014, 08:03 AM
Gold Member
 
Join Date: Apr 2012
Location: California Central Coast
Posts: 955
Pressure test ladder - how do I do it

My 338/26-Nosler should be done any day now.

I have my MagnetoSpeed V2 and a Pressure Trace II.

I want to do some pressure measurements to document actuals for powder+bullet combinations.

Does anyone have a ladder format for this?
__________________
Fred Seaman
“Ask, Listen, Learn, Grow”
Reply With Quote
  #2  
Old 08-24-2014, 08:00 AM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,270
Re: Pressure test ladder - how do I do it

What do you want to do?
Reply With Quote
  #3  
Old 08-24-2014, 02:43 PM
Gold Member
 
Join Date: Apr 2012
Location: California Central Coast
Posts: 955
Re: Pressure test ladder - how do I do it

Quote:
Originally Posted by Mikecr View Post
What do you want to do?
I what to publish numbers that I have confidence in.

Say I find that the max load produces 2850fps with xxx bullet at yyy COAL, what is that pressure really?

So, I'm looking for input on methodology.

I could:
Make one load of 3 rounds and validate predictions vs actual.
Make 1 round from the predicted minimum to maximum and run the series. Validate that against the model.

Then run 3 rounds of min and 3 of max to double check.

Is that the best or most 'normal' method for producing pressure ladders?
__________________
Fred Seaman
“Ask, Listen, Learn, Grow”
Reply With Quote
  #4  
Old 08-24-2014, 04:03 PM
Gold Member
 
Join Date: Jul 2012
Location: North Central Valley California
Posts: 582
Re: Pressure test ladder - how do I do it

I'm not sure how you would apply the ladder test principal to your objective but you can read everything about ladder testing at:
Long-Range Load Development
To obtain meaningful results you'll need a lead sled or a similar type of rest.
__________________
I have a great woman, fantastic kids, a warm place to sleep and an accurate rifle. Life is good ..............
Hunter Safety Instructor - Rifle/Pistol Marksmanship Instructor

American riflemans triad - God, guts and guns. It built America and it'll preserve America. Abandon one and you lose them all.
Reply With Quote
  #5  
Old 08-25-2014, 01:02 AM
Gold Member
 
Join Date: Feb 2008
Posts: 503
Re: Pressure test ladder - how do I do it

I don't really understand want you want to do, maybe comparison to quick load is your aim?
What model are you referring to?

Anyway, I have a Pressure Trace II, the numbers it supplies are absolute pressure, no fudge factors or subtracting a form factor for discrepency to reference ammo.
I tried the factory ammo comparison, but found it was well down from SAAMI spec in all rifles tested.
These days when I start testing a new bullet/powder combo, I just test for pressure and whatever it spits out I accept as being whatever. I load one round for each powder weight and test.
I don't average anything out, just shoot and what is, is.

Cheers.

Last edited by MagnumManiac; 08-25-2014 at 01:04 AM. Reason: stupidity
Reply With Quote
  #6  
Old 08-25-2014, 01:54 AM
Gold Member
 
Join Date: Apr 2012
Location: California Central Coast
Posts: 955
Re: Pressure test ladder - how do I do it

Quote:
Originally Posted by MagnumManiac View Post
...
I load one round for each powder weight and test.
...
That's the kind of thing I'm looking for.
__________________
Fred Seaman
“Ask, Listen, Learn, Grow”
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Do you archery hunt for elk?
YES - 34.48%
120 Votes
NO - 48.28%
168 Votes
Not yet, but I plan to. - 17.24%
60 Votes
Total Votes: 348
You may not vote on this poll.

All times are GMT -5. The time now is 01:29 AM.


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