Author Topic: Velocity differences between 24" and 7"  (Read 4714 times)

Offline matt45

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Velocity differences between 24" and 7"
« on: October 10, 2013, 06:24:22 PM »
Hello the Camp,
     I just finished testing two loads in my Henry and my Schofield.  A smokeless load (5.0 grs. Bullseye/200 gr cast) had a velocity of 956 fps. in the Henry, and 717 fps in the Schofield- A 239 fps difference.  The B.P. load was 892 for the Henry; 675 for the Schofield, a 217 fps difference. 
     Now I've got to clean the darn things :P

Offline Trailrider

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Re: Velocity differences between 24" and 7"
« Reply #1 on: October 14, 2013, 10:45:45 PM »
About 12-14 ft/sec/inch. About right, regardless of caliber.
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Offline matt45

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Re: Velocity differences between 24" and 7"
« Reply #2 on: October 15, 2013, 10:24:53 AM »
The caliber is 45 S&W (Schofield).

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Re: Velocity differences between 24" and 7"
« Reply #3 on: Today at 02:40:09 AM »

Offline Coffinmaker

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Re: Velocity differences between 24" and 7"
« Reply #3 on: October 19, 2013, 10:11:12 PM »
OK.  That does it.  I'm gonna cut one of my Henrys down to 7 1/2 inches ................  :-)

Coffinmaker

Offline Sir Charles deMouton-Black

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Offline w44wcf

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Re: Velocity differences between 24" and 7"
« Reply #5 on: November 30, 2013, 07:49:04 AM »
Hello the Camp,
     I just finished testing two loads in my Henry and my Schofield.  A smokeless load (5.0 grs. Bullseye/200 gr cast) had a velocity of 956 fps. in the Henry, and 717 fps in the Schofield- A 239 fps difference.  The B.P. load was 892 for the Henry; 675 for the Schofield, a 217 fps difference. 
     Now I've got to clean the darn things :P

Matt,
Thank you for your test results. Just curious.....what was your b.p. load?
36 grs. FFG typically gives 1,200 f.p.s. in my .44-40 '73 (21" barrel).
Interesting in a 24" barrel, the velocity gain was only 21 f.p.s. for the additional 3". 

w44wcf
aka Jack Christian SASS 11993 "I can do all things through Christ who strengthens me." Philippians 4:13
aka John Kort
aka w30wcf (smokeless)
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.22 W.C.F., .30 W.C.F., .44 W.C.F., .45 Colt Cartridge Historian

Offline matt45

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Re: Velocity differences between 24" and 7"
« Reply #6 on: November 30, 2013, 10:12:18 AM »
     These were pretty anemic- by weight they measured 28 grs.  I was experimenting w/ spg wads to reduce fouling in the Uberti Schofield.
     

Offline matt45

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Re: Velocity differences between 24" and 7"
« Reply #7 on: November 30, 2013, 10:14:45 AM »
 ::)
... and in case you weren't tired of hearing fom me.
      The actual difference is =/- 250 fps.  Slightly more than the rule of thumb 10 fps per " of barrel

Offline rickk

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Re: Velocity differences between 24" and 7"
« Reply #8 on: December 05, 2013, 12:08:03 PM »
some of the loss might be from the barrel/cylinder gap as well.

 

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