357 shows its face: BENJAMIN BULLDOG
Well another 357 bullpup comes up agian and I know you guys are just so happy (sarcasm)!!! :rofl: Well anywho I love those 357s sucks up my air but fun to shot…
The Benjamin Bulldog is to shot groups of nearly 800 feet per second (FPS) with 200 foot pounds of energy (FPE) when using the Benjamin eXTREME airgun 145 grain hunting bullet by Nosle!!
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Can’t wait to see some accuracy results and some crony #’s and shot count. If this gun does what is says I will have to get one if the accuracy is there too.
OPENING OF THE BULLDOG…. SORRY IMAGES TAKEN WITH C.PH NOT THE BEST
From what I found out pellets most likely will not work out so well with this twist rate along with most of the 357 bullets out there (they are not long enough) Hope someone can prove this wrong… For now all I have is JSBs and 100 rounds of $$$$ Noslers
With JSBs 357 pellets you may be pushing into the 1100fps range
PS this gun is at least Pyramid Air sound level 4
Hoot:
Lighter pellets are shorter and require even less twist. That’s why Korean guns with short magazines use 20:1 twist rate. With pellets you can go even lower in twist as they are partially drag stabilized in fly.
Miller twist Rule
Caliber 0.357 Inches
Bullet Weight 145 Grains
Bullet Length 0.6 Inches***
Barrel Twist 14 Inches/turn
muzzle velocity 800 fps
Temperature 80 degrees Fahrenheit (59 is standard)
Pressure 29.92 inches of mercury (29.92 is standard)
Sg = 6.63 (OVER STABILIZED)
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CORRECTION
Caliber 0.357 Inches
Bullet Weight 145 Grains
Bullet Length 0.75 Inches***
Barrel Twist 14 Inches/turn
muzzle velocity 800 fps
Temperature 80 degrees Fahrenheit (59 is standard)
Pressure 29.92 inches of mercury (29.92 is standard)
Sg = 3.75 just under the over Stabalization… I guess
Sg shouldn’t be less than 1.4. If Sg is greater than 2.0 or large cal handgun 4.0, you may
gain some accuracy by going to a slower twist barrel.
“miller” lol…. used the specs of the Nosler exstreme 357 bullet that Crosman/benjamin is pushing for this gun.
(though not sure of the length for this round) which makes a big difference on your twist rate….
correction***** Nosler Exstreme is .75″ long
Why didn’t Miller just try a lighter slug???
Hoot:
Ok the more I dig into finding info to determine the right ammo the more complicated it gets.. haha
So I came across one of many formulas this one for twist rate, which pretty much shows that the ammo available for the Benjamin 14” twist barrel is over stabilize as shown below…
Miller twist Rule
Caliber 0.357 Inches
Bullet Weight 145 Grains
Bullet Length 0.6 Inches***
Barrel Twist 14 Inches/turn
muzzle velocity 800 fps
Temperature 80 degrees Fahrenheit (59 is standard)
Pressure 29.92 inches of mercury (29.92 is standard)
Sg = 6.63 (OVER STABILIZED)
Sg shouldn’t be less than 1.4. If Sg is greater than about 4.0, you may
gain some accuracy by going to a slower twist barrel.
EMAIL FROM GREEN MOUNTAIN about the barrel. (no help there either)
————–
The Benjamin Bulldog 357 are made proprietary for Benjamin/Crossman and you will need to contact them for detail information.
Thank you for your inquiry.
Michael Hagar
Dealer/Retail Sales
Green Mountain Rifle Barrel Co.
With Matts ammo….
-what should I have it sized too?
-I was looking at these cast bullets to start to keep the fps close to the 900 range
357 ammo
> 93 Grain Round Nose
> 100 Grain Truncated Cone
> 105 Grain Semi-Wadcutter
> 125 Grain Spire Point
Anyone with cast bullet experince please pipe in
I’d go for .357, you loose no velocity with smaller size and the bullet deforms less if it doesn’t touch the rifling groove bottom. The only thing to worry about is if the bullet is too small for rifling lands but that shouldn’t be the case as crosman states .357 ammo is suitable.
.358 is a good bet, I’ve shot .358 bullets out of a number of guns and it’s always been the best size
.359 .360 depends on the bore diameter. Might need to call GM or slug the bore ( which I’m not sure you could slug a AG barrel )
So as I stated prior that Crosman would not give me their land groove measuremenst but stated to me that the Bulldog uses 357-358 sized ammo.
With Matts ammo….
-what should I have it sized too?
-I was looking at these cast bullets to start to keep the fps close to the 900 range
357 ammo
> 93 Grain Round Nose
> 100 Grain Truncated Cone
> 105 Grain Semi-Wadcutter
> 125 Grain Spire Point
Anyone with cast bullet experince please pipe in
Well, it’s not a bullpup, but it certainly is priced right!
Hatsan Carnivore Big Bore Air Rifle $749 for either .30 or .357 caliber http://www.airgundepot.com/hatsan-bt-big-bore-carnivore-qe-air-rifle.html
Hoot:
NEW NEWS….
The Bulldogs barrel is made for Crosman by Green Mountain.
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Hoot:
Lighter pellets are shorter and require even less twist. That’s why Korean guns with short magazines use 20:1 twist rate. With pellets you can go even lower in twist as they are partially drag stabilized in fly.
Not a lighter “pellet”, but a lighter lead slug? A hollowpoint can trim a LOT of weight off of that .357, maintain it’s length, and get the fps up to speed without sacrificing any appreciable FPE…
I know they are available out there in several different weights. That poly tip isn’t all that great at air gun speeds. A common hollow point, or solid slug should do just fine for the game we hunt and the ranges we shoot! Get that slug down to 90 to 100gr and then take a look at performance.
This gun has possibilities, but Crosman couldn’t release a product properly if they tried. We don’t hunt African animals and I sure as hell wouldn’t take an airgun to Africa!!! We don’t need that big and complicated a slug! That’s horseshit product marketing for Nosler and removes the true potential from the Bulldog. Give the gun the right ammo and I’ll bet it will perform with excellence.
Hoot:
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