I am still in the early phases with this one, but so far it is running ok. 1/2" OD 35.5" long TJ's 25-20 barrel sleeved to 19mm with CF. Added Matt's 160cc tube extension for ~500cc of air, IIRC.
The current tune is 7 shots 1023, 1044, 1049, 1052, 1045, 1042, 1028fps, a 7 shot average of 1040fps, 165fpe. 3100psi fill. It uses about 500 psi of air. Bullets are MP Molds 257-640's molded with the deep hollowpoint pin, this batch weighs 68.7 - 68.8gr. At 3200psi and HST dialed up it maxes out at 1125fps with these bullets.
48" long with the Koi, just under 42" in loud mode. Believe it or not the little Koi does a surprisingly good job of knocking the edge off, even at 165fpe.
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Still a lot of work to do, but so far so good.
The current tune is 7 shots 1023, 1044, 1049, 1052, 1045, 1042, 1028fps, a 7 shot average of 1040fps, 165fpe. 3100psi fill. It uses about 500 psi of air. Bullets are MP Molds 257-640's molded with the deep hollowpoint pin, this batch weighs 68.7 - 68.8gr. At 3200psi and HST dialed up it maxes out at 1125fps with these bullets.
48" long with the Koi, just under 42" in loud mode. Believe it or not the little Koi does a surprisingly good job of knocking the edge off, even at 165fpe.
Still a lot of work to do, but so far so good.