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(Factory) Remington 130gr FP across the chrono. It ain't pretty.


ysrracer
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PF = weight of bullet in Gr times the average velocity divided by 1000

 

130x 754 = 9802/1000 = 98.02 

 

Edited to correct my mistake. I read 180 instead of 130 Gr. Getting old sucks especially reading without my glasses.

 

my apologies.

Edited by George16
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2 minutes ago, George16 said:

Your power factor is 135.72

 

PF = weight of bullet in Gr times the average velocity divided by 1000

 

180 x 754 = 135,720/1000 = 135.72

 

I don’t know how you came up with the 98 power factor.

His bullet is 130 grain not 180 his numbers were right.

 

BUT the chrono needs to be 10 feet from the muzzle and for ICORE you only need 1 shot so 130 x 813 = 105 PF still under the 120 needed.

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3 minutes ago, pskys2 said:

His bullet is 130 grain not 180 his numbers were right.

 

BUT the chrono needs to be 10 feet from the muzzle and for ICORE you only need 1 shot so 130 x 813 = 105 PF still under the 120 needed.

Damn, my mistake,. I read 180. Getting old sucks.

 

My apologies.

Edited by George16
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4 minutes ago, ysrracer said:

 

You're joking right? You know bullets aren't like rockets, they don't speed up.

Muzzle blast affects chrono results when too close. This is why the instructions most likely tell you 10-12 feet. It’s why USPSA says at least 10 feet. This way you are only measuring bullet speed and not muzzle Blast.

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I actually read the instructions that came with my chrono and it recommended 12 to 15 feet for accurate handgun measurement.

 

My revolver produces a similar velocity spread. It was explained to me (by someone fairly smart on such matters) that each chamber in the cylinder will chrono differently. So when developing a load, I go up to the point that all the shots in a moon make PF.

 

Lastly, I know Blazer Brass .38 special doesn't make PF either. I've been told almost no factory ammo does. When I went to hand loading, I had to get into the +P end of the charts to make ICORE PF and push it even a little higher to make USPSA.

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The velocities listed look pretty right for factory 38spl. also the velocity spread is pretty common too, think of a revolver as 6 or 8 different guns as each chamber will shoot a bit differently, when I chrono several clips through the gun I can totally see the pattern of fast and slow chambers from clip to clip 

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