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May 18, 2010, 06:40 PM
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#1 |
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Member
Join Date: January 23, 2010
Location: park county colorado
Posts: 30
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big variances
I just got back into reloading, im reloading 45 colt with Titegroup and 180 200 and 250 grain lead rnfp. I got my chronograph last weekend and headed out to test my 5 different recipes. In each batch the difference between my highest velocity and my lowest is like a few hundred fps. My powder measure seems to be throwing consistent charges cause I will weigh one from time to time while reloading that batch. I have the cowboy dies from rcbs for my rockchucker. Could the crimp be causing such a difference here. This particular die seats and crimps at the same time. I get a little pop or bump in the handle when the crimp is done. Im not sure what im doing wrong any help would be great, thanx charlie
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May 18, 2010, 06:42 PM
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#2 |
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Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
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How far were you from the chronograph? You should be at least 10 feet.
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Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley |
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May 18, 2010, 06:45 PM
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#3 |
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Senior Member
Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
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With that powder and those bullets, a "few hundred" fps variance is more than the difference between min and max loadings - quite a bit more.
Do you have a lot of experience with your chronograph? Is there any chance you have it too close to the muzzle and are getting inaccurate readings? |
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May 18, 2010, 06:57 PM
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#4 |
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Member
Join Date: January 23, 2010
Location: park county colorado
Posts: 30
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this is the first time Ive ever used one and I was only about 4 or 5 feet from the first eye. Also I have never gone over the max velocity of any load as a matter of fact I havent been able to produce the velocity stated in the book. My readings have all been lower. Which I know is not good either. I would think being to close to the chrony would give me false high reading but im new to this.
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May 18, 2010, 06:58 PM
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#5 | |
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Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
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Quote:
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Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley |
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May 18, 2010, 07:00 PM
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#6 |
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Senior Member
Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
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That's probably it - you're likely getting false readings from the sensors picking up muzzle flash, powder particles, etcetera. Move it back to at least ten feet and try again before you worry any more about your loads.
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May 18, 2010, 07:01 PM
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#7 |
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Member
Join Date: January 23, 2010
Location: park county colorado
Posts: 30
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ok thanx guys ill try again this weekend.
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May 18, 2010, 07:01 PM
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#8 |
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Senior Member
Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
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Okay Pete - you either read or type faster than I do, and my posts don't seem to add anything to yours, so I'll bow out.
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May 18, 2010, 07:03 PM
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#9 | |
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Moderator Emeritus
Join Date: June 25, 2008
Location: Austin, CO
Posts: 19,578
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Quote:
 I just have too much time on my hands! (Call and order a pizza, would ya? I'm bored!)
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Nobody plans to screw up their lives... ...they just don't plan not to. -Andy Stanley |
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