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Pressure test ladder - how do I do it

 
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  #1  
Old 08-23-2014, 08:03 AM
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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?
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  #2  
Old 08-24-2014, 08:00 AM
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Re: Pressure test ladder - how do I do it

What do you want to do?
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  #3  
Old 08-24-2014, 02:43 PM
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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?
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Old 08-24-2014, 04:03 PM
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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.
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  #5  
Old 08-25-2014, 01:02 AM
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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
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  #6  
Old 08-25-2014, 01:54 AM
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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.
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