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muzzle velocity inconsistant

 
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  #1  
Old 07-10-2011, 10:05 AM
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muzzle velocity inconsistant

I just started reloading and I'm having trouble with my velocities jumping around, 7 mm REMmag. I'm getting up to 100 fps difference. What gives. I have digital scales, and I'm trying to get the powder load to within a 10th of a grn, but I must be doing something wrong,.

Last edited by GoArmy; 07-10-2011 at 10:32 AM.
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  #2  
Old 07-10-2011, 12:11 PM
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Re: muzzle velocity inconsistant

how close to the chrono is the rifle? also intermittent sun and cloud will sometimes give wacky readings. If the grouping is consistant I would say that it probably is more than likely the chronograph giving false readings. Hope this helps
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Old 07-10-2011, 12:34 PM
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Re: muzzle velocity inconsistant

I was a good fifteen feet away from the crony, and in a shaded area, I had the cronograph laying on the ground. This crony is like new.
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Old 07-10-2011, 12:38 PM
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Re: muzzle velocity inconsistant

is your POI consistant with this load setup or all over the place as well as the velocity?
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Old 07-10-2011, 12:43 PM
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Re: muzzle velocity inconsistant

The rifle yesterday shot a 3/4 group at 100yrd with this batch of reload
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Old 07-10-2011, 03:46 PM
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Re: muzzle velocity inconsistant

I would try moving the chronograph out a bit further then, that sounds like it's too consistent to have a spread of 100fps to me. I have in the past had to set a chrono out as far as 25' to get a proper reading that wasn't being affected by the muzzle blast
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Old 07-10-2011, 04:02 PM
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Re: muzzle velocity inconsistant

Quote:
Originally Posted by bman73 View Post
I would try moving the chronograph out a bit further then, that sounds like it's too consistent to have a spread of 100fps to me. I have in the past had to set a chrono out as far as 25' to get a proper reading that wasn't being affected by the muzzle blast
You may be on to something there, the 7 mag throws a hell of a blast, and I was doing this on dusty gravel, and I had the crony sitting on the ground, and I was also.
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