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| | | |-+  How much velocity is lost when converting to an SBR?
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Author Topic: How much velocity is lost when converting to an SBR?  (Read 1319 times)
300winmag
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« on: August 09, 2017, 04:14:18 PM »

Anyone have any confirmed data* on how much velocity is lost when converting a PS90 to an SBR?

*confirmed via chronograph.

Eric B.
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300winmag
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« Reply #1 on: October 12, 2017, 10:31:03 PM »

FOUND IT!

Wikipedia, in their 5.7 x 28 article has a chart that shows the SS197 (the current blue tip V-Max FN round) has a muzzle velocity of 1,0950 ft./sec. from a P90. A footnote to that chart says there is about 150 ft./sec. more velocity from a PS90.  So you're pretty close on that guesstimate.

Eric B.
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pilot4prophet
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« Reply #2 on: February 18, 2018, 01:18:32 PM »

Buffman Range on YouTube does a lot of 5.7x28 chrono and gel testing. Check it out. From what I've seen it's about 150-200 FPS loosing 4" of barrel.
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300winmag
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« Reply #3 on: May 26, 2018, 01:29:48 PM »

That's actually a lot of velocity loss for a "handier" PS90 and a tactical look. What I like about the PS90 IS its god range.

This velocity loss is the main factor making me hesitate to get an SBR. I'm a long range rifle competitor and that kind of loss in a centerfire rifle is quite a bit. Maybe that's why I am so sensitive to this.
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Hkbeltfed
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« Reply #4 on: May 26, 2018, 07:03:47 PM »

The PS90 is a derivative of the P90, so one could argue it should be a SBR. Needs for a longer barrel/bigger gun are better addressed with a X95 or AUG in my opinion.

Current PS90 SBR owner as well as a X95 and AUG, both pinned and welded and slightly over 26" each.
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pilot4prophet
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« Reply #5 on: May 27, 2018, 08:03:46 AM »

To be fair, the 5.7x28 was not really designed to be a long range killer. I've got my SBR sighted in for a maximum PBR of about 225 yds. I really don't think I'd take a shot over 150. If the expectation is big trouble then a full power rifle is the answer.
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