Bulldog modification log .328 porting and more

[Lani52]

I got 865 FPS today with the NOE152 grain bullet.

SPECS;
.30 porting, oem valve, heavier spring 4 turns in -spring was supplied for JSAR valve, 2900 psi fill, 2nd shot from 6 feet, first shot was an err,  starting pressure 2900 psi ending after 2 shots 2600 psi, first shot sounded slightly weaker than 2nd shot which was hellashish, NOE 152 hp” 40-1 sized .358, valve spring in, but will take out on next tear down.

Barrel is cut to 27 inches.

Roachcreek

[Kinetic45^]

Lani, if you hunt with the NOE 152, please post how the bullet does because I would like feedback from others confirming that I got the HP cavity juuuusssttt right and if there is enough retained bullet weight to carry through for a good exit wound.

At 865 FPS, that's 243 FPE so should be good for deer, hogs and large varmints.

I have mine* all sighted in at 85 yard zero which at 865 FPS would be:  0" at 12 yards, 3.4" high at 50 yards and -3.4" low at 100 so that easily covers most of my hunting ranges for 'Point Blank Range' quick kill zone shots (without having to do a lot of range and trajectory mental calculations).

*  .357 Texan, Pitbull, SuperFLEX and my "secondhand" Slayer {still have not received the new Slayer from AAA though}
(the Slayer gets 977 FPS avg [fill 3500] with the NOE 152 which casting @ 800 degrees using 1:40 alloy drops 147gr)

[Red FR]

...I'm thinking about running a low power bulldog with a regulator, for high shot counts, at about 80 FPE... and I was wondering how the JSA valve SOUNDS.

I mean, with a heavy moderator, the loudest sound is right now the hammer ping -- so, with a far lighter hammer, does it ping much less?

[PCPhack]

...I'm thinking about running a low power bulldog with a regulator, for high shot counts, at about 80 FPE... and I was wondering how the JSA valve SOUNDS.

I mean, with a heavy moderator, the loudest sound is right now the hammer ping -- so, with a far lighter hammer, does it ping much less?

The JSAR valve is balanced, so it needs much less hammer strength to open, and will therefore be quieter. On a Bulldog the muzzle blast is the loudest event anyway, so unless you have truly tamed that bark already, I don't think it will make that much difference. The ping sound that the Bulldogs make is often the reservoir resonating. Have you put a depinger in it? Pitbull sells one.

[Tonycalves]

I have a JSAR valve and the TP opened up and the pitbull depinger with their mega moderator. No reg then put a .25 Mrod hammer spring in (6,8,10lb not sure) and milked 10 shots at 95-105 fpe spread @ 30 yards it was acceptable, still had a little bark.  Pellet hitting the spinners was louder, but pellet on metal isn't that quiet.

[FuzzyGrub]

...I'm thinking about running a low power bulldog with a regulator, for high shot counts, at about 80 FPE... and I was wondering how the JSA valve SOUNDS.

I mean, with a heavy moderator, the loudest sound is right now the hammer ping -- so, with a far lighter hammer, does it ping much less?

80FPE seems very slow for the available pellets, but here is my thread of a 130FPE Bulldog, using a reg and longer air tube: https://www.gatewaytoairguns.org/GTA/index.php?topic=126825.msg1242622#msg1242622

[Red FR]

But have you had stuck pellets at >2000 psi?
I plan on going regulated ~2000 / ~135 BAR with an extended reservoir that is rated for at least 250 bar fill pressure.

The JSAR valve is balanced, so it needs much less hammer strength to open, and will therefore be quieter. On a Bulldog the muzzle blast is the loudest event anyway, so unless you have truly tamed that bark already, I don't think it will make that much difference. The ping sound that the Bulldogs make is often the reservoir resonating. Have you put a depinger in it? Pitbull sells one.

Got an emperor and regulator, and the hammer is the loudest part right now, before the impact.
You'd think DIRT would be more quiet, but most hits sound like whip cracks regardless.

The dream is being able to fire 30 grizzlies or balls from an extended reservoir at 20 yards into and out of my garage with my secondary bulldog.
Just the cheapest possible bulk ammo -- saving the more expensive ammo for the long range max power build and 100 yard target practice.

[PCPhack]

I dusted off the Bulldog and ran some maximum numbers at 4300 psi (titanium air reservoir) just for fun.


178gr 958fps 363fpe
142gr 1042fps 342fpe

I am thinking about selling it because I am now spending so much time with the Texan, and want to focus on new projects. On the other hand, it's nice to have. Somehow I need to thin the heard. 

[Jzizzle]

Anybody working on a 7mm conversion with the bulldog?

[Lani52]

David,

I have been thinking the same thing.  My ti tube with valve is sitting in the floor in my Air room on the floor.

What I need is a stock 2nd Bulldog ro put it on.

Rochcreek

[Kinetic45^]

A 7mm Bulldog?
See this thread and post #19
https://www.gatewaytoairguns.org/GTA/index.php?topic=165806.0

[Tonycalves]

Wow David that's screaming for a Bulldog!

[PCPhack]

Wow David that's screaming for a Bulldog!

Yeah, that's a real declining tune, but fun to max it out. If I tune it for 2 shots equally and a only 4000 psi fill, it will get 325 FPE each shot. With a 3 equal shot tune, it gets 300 FPE. I usually hunt with it using the 2 shot tune in case I were to need a follow up shot (and of course it can shoot more than 2 shots, they will just be a bit less powerful). 4000 is a reasonable maximum to allow for fills out while hunting from a larger 45000psi bottle, especially because once the tank is outside, it gets cold and can easily drop a few hundred psi.

[Jzizzle]

A 7mm Bulldog?
See this thread and post #19
https://www.gatewaytoairguns.org/GTA/index.php?topic=165806.0

I will be following your thread pertaining to this conversion!  Thanks