BULLPUP FORUM

Bullpup Rifles (Auto & Semi-Auto Centerfire) => P90 / PS90 P90 icon => Topic started by: 300winmag on August 09, 2017, 04:14:18 PM



Title: How much velocity is lost when converting to an SBR?
Post by: 300winmag 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.


Title: Re: How much velocity is lost when converting to an SBR?
Post by: 300winmag 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.


Title: Re: How much velocity is lost when converting to an SBR?
Post by: pilot4prophet 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.