Velocity change / barrel length. If I'm looking at
ChrisG
[subject]
Sunday, January 20, 2019, 09:57 (2784 days ago)
357 data chrono'd out of a 6 inch revolver, what kind of velocity increase should I expect out of a 8 3/8 barrel? 50fps / inch or roughly 100 fps? Just curious thanks!
sounds optimistic, 25 to 35 fps is closer to what i find.
Blake
[subject]
Sunday, January 20, 2019, 10:19 (2784 days ago) @ ChrisG
your mileage may very all guns are different
25 to 35 fps per inch to clarify
Blake
[subject]
Sunday, January 20, 2019, 10:21 (2784 days ago) @ Blake
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both Blake and huey are right. On a gun with a
Gary Reeder
[subject]
Sunday, January 20, 2019, 10:44 (2784 days ago) @ ChrisG
barrel cylinder gap where it should be in the .002 to .003 you will lose or gain about 35 fps per inch. If your barrel cylinder gap is .006 to .010 which is not unusual in a factory gun, you will lose up to 250 fps period, no matter what your barrel length is.
One thing I do disagree with the rest of the answers is once I or Sean does the ballistics on a new cartridge, if the gun is accurate I don't worry about the FPS. Speed doesn't kill, accuracy does. my recommendation would be sell the chrono to a friend and enjoy shooting without worrying about the fps. I own a few guns and I have never chrono'd any of them and don't plan to. I find a load that is accurate and stay with that. Life is way too short to worry about the FPS my gun puts out.
Thanks! I never have invested in a Chrono.
ChrisG
[subject]
Sunday, January 20, 2019, 12:29 (2784 days ago) @ Gary Reeder
If I found myself with a ton of free time someday I might-but handloading takes up a lot of time anyway without that extra dynamic. . .
Chronographs are the playthings of the devil!
Drdougrx
[subject]
Sunday, January 20, 2019, 18:05 (2783 days ago) @ Gary Reeder
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If you spent your formative gun years in the 70s and 80s
Ray
[subject]
Monday, January 21, 2019, 10:39 (2783 days ago) @ ChrisG
you read the velocity tables in the Gun Digest and the gun magazines extolling the virtues of magnum rounds and the velocities they were able to attain. That's what I zeroed in on, anyway. Chronographs started to become available in the mid 80s and more affordable in the 90s which is when I got my first one. I was very interested in chronographing loads until I flinched a shot from my 500 L through the guts of my chronograph. I still haven't replaced it and am now content to hope that shot placement trumps velocity anyway.