Hollow-Point/Soft Point - Required Velocities for Expansion?


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scotjute
November 16, 2012, 11:15 PM
What are the general velocities required for hollow point bullets to expand?

What are the approximate velocities required for soft-point bullets to expand?

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481
November 16, 2012, 11:28 PM
Depends on the manufacturer and the design.

Hornady lists upper and lower recommended velocities for their XTP JHPs in their reload component bullets.

Here are a few examples taken from an XTP package insert-

.25 35 gr XTP 700-1000 fps
.32 85 gr XTP 750-1550 fps
.32 100 gr XTP 800-1800 fps
.355 90 gr XTP 800-1400 fps
.355 115 gr XTP 800-1400 fps
.355 124 gr XTP 850-1350 fps
.355 147 gr XTP 750-1200 fps

R.W.Dale
November 16, 2012, 11:56 PM
It depends on what the exact bullet in question was designed to do.

No "rules of thumb" can be made.




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jmr40
November 17, 2012, 06:58 AM
Rifle or handgun?

Most rifle bullets need 1600-1800 fps. Some of the premium bullets need closer to 2000 fps

scotjute
November 17, 2012, 09:39 AM
Mostly interested in the handgun cartridges. .38 special and .357 are what I use mostly, but the same information should carry over to any handgun cartridge shouldn't it?
When I see Jacketed Soft Points and Jacketed Hollow Points in cartridges with velocities ranging from 850 fps to 1450 fps can't help but wonder which if any of them actually work.

481
November 17, 2012, 09:55 AM
Mostly interested in the handgun cartridges. .38 special and .357 are what I use mostly, but the same information should carry over to any handgun cartridge shouldn't it?

Not necessarily. The mechanism that initiates and drives expansion (hydraulic forces) is the same, but due to manufacturing differences (type of lead and copper alloys used, structural/dimensional variances, etc.) just how much expansion (if any) you'll get from a JHP or a JSP is unpredictable, even within the same design. The only way to know for sure is to test them in calibrated gelatin or water.

When I see Jacketed Soft Points and Jacketed Hollow Points in cartridges with velocities ranging from 850 fps to 1450 fps can't help but wonder which if any of them actually work.

Although manufacturers can tell you the "velocity window" required for a JHP/JSP's expansion, there is some variance in that number. It usually isn't much, but it can be significant. It also depends on what the JHP/JSP hits- some materials will not produce expansion and others can inhibit it like clothing which may clog the expansion cavity of a JHP and stop it from expanding even if it hits soft tissue.

hardluk1
November 17, 2012, 07:23 PM
To random a question be be practical

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