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Change of primers,Powder charge reduction.

 
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  #1  
Old 04-01-2007, 04:35 AM
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Join Date: Nov 2006
Location: United Kingdom
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Change of primers,Powder charge reduction.

This is my latest problem, due to a lack of primer choice/brands,i have recently purchased a 1000 Fed Gold medal Match MAGNUM primers. Im loading 308 and 243 with Vhit 140 and 160 respectively.I have been using Fed 210s for years but have finally ran out. A couple of friends say that if i reduce the Powder load a little that it will be fine/safe.HOW MUCH IS A LITTLE.???? Any starting points, is there a rule of thumb?. None of my loads are really hot,308 is about 2500fps, 243 is about 3400fps.This is worked of load data as i have no chrony.
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Old 04-01-2007, 05:59 AM
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Re: Change of primers,Powder charge reduction.

I don't like giving people advice on what is a "safe load", but I will let you know that it has been my experience that the loading data tells you a fairly higher velosity that what you will actually get. I am shooting in Mn, approximately 1000 feet of elevation, and my results are about 150-200 fps slower than what the load data has been estemating. I have to admit that it is possible that it is my Chrono, (a old cheap prochrono). I have been meaning to test it compared to someone elses sometime.
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Old 04-01-2007, 01:47 PM
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Re: Change of primers,Powder charge reduction.

If your current loads are never showing any pressure I wouldn't expect the primer change to even be measurable. I use magnum primers in everything they will fit in. (22-250 and up) Load 5 for a test and shoot them. If they pass the test you are most likly fine. The temperature change of 30 degrees will affect your pressure a lot more than a primer change.
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Old 04-03-2007, 01:34 AM
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Join Date: Mar 2004
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Re: Change of primers,Powder charge reduction.

I would guess that your groups might be affecteed more than a dangerious load concept. I use the Vit 500 series powder and see a velocity & SD change when changing from reg to mag primers. Every situation is different. Try a few and test your groups. Good luck. [img]/ubbthreads/images/graemlins/cool.gif[/img]
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