TUNED BULLDOG .357 with ENHANCED SUPRESSION
SCOPE NOT INCLUDED
Includes 50 Benjamin Nosler 145 grain bullets, 50 hollow-point 165 grain bullets from Mr. Hollowpoint and 2 five-round rotary magazines. Bullets are available in larger quantities, contact for price.
Shipped empty of air for liability reasons.
This .357 caliber rifle is side-lever bolt action. It's tuned and modified for improved accuracy, more power and a better balanced power curve. It's very accurate producing quarter-sized groups at 20 yards. It shoots 81 grain JSB pellets at 1000+ FPS. With 145 grain bullets the first five shots through the chrony were 811, 822, 828, 819 and 808. All five shots were 210-220 FPE. With heavier ammo it can produce 230+ FPE. This level of performance was accomplished with the mods described below and the original hammer spring adjusted to full tension. A starting pressure of 3100-3200 PSI is optimal. It held exactly 3000 PSI for over a year in storage, it does not leak. It's lightly used in excellent condition with about 200 shots through it.
I modified the Pitbull silencer for more effective suppression and bored it out perfectly straight. The barrel mount was removed to allow more back-flow into the shroud. It's much quieter this way. With the original Bulldog barrel mount in place, the original shroud cap and silencer can be switched easily, only the two front shroud-cap screws hold them in place. The original cap is included. I suggest using it in difficult terrain where the silencer and shroud could be damaged if the silencer was hit hard. The silencer is so quiet the air-blast can barely be heard over the striker ping. It's a lot more pleasant to shoot and a lot more backyard friendly.
The second photo shows all parts that were improved and is fallowed by close-ups of some of those parts. The last three show the starting PSI, how to adjust the power level and the included bullets. I set it to low power by backing out the striker spring adjuster until it is flush with the housing. For high-power I tighten the spring adjuster until it stops.
This is a brief explanation of the work done. The plastic sleeve that restricts the transfer port was eliminated. The valve and barrel ports were enlarged to match the transfer port. Contact points and surfaces were polished to smooth the trigger, bolt and striker action. The valve and striker springs were re-ground to square them better, this improved valve, bolt and striker consistency. The sealing edge on the valve stem was rounded more to improve air flow. The front cap on the shroud was bored off-center so I enlarged the hole just enough to correct that. All of the o-rings were upgraded to 90D for improved durability and a more stable shroud mounts. All of the external screws were upgraded to heat-treated stainless steel so the entire exterior is weatherproof.
SHOT COUNT AND HAND PUMP USE : Starting around 3100 PSI, a five shot string on full power leaves about 2300. Using a Benjamin hand pump it takes about 90 pumps to get back to 3100. After one full-power shot it takes about 17 pumps, 3 full-power shots about 55 pumps. Adjusted to low power it takes about 35 pumps after 5 shots and about 55 pumps after 10 shots. With 145 grain a ten shot string on low power starts at 500 FPS and climbs to 640. With 81 grain 10 shots start at 650 and climb to 790. Using a hand pump is relatively practical if you limit yourself to 10 low power or 3 high power shots before filling. These results were achieved using 145 grain bullets and 81 grain pellets. This gun gets difficult to pump as the pressure nears 3000 PSI, filling from a tank may be necessary for some.