Guns!!

cannabineer

cannabineer

Ursus marijanus
Blue Wizard said:
I knew wheel gun rounds were slow, but all the auto pistol rounds I've got are much quicker. Don't own any .45 ACP but I have a .44 mag, .45 long colt and a .44 cap and ball revolver.
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"Fast" autopistol rounds are a fairly recent phenomenon. The .25, .32, .38 and.45 ACP couldn't crack a thousand until light bullets and fast powders made for a few 1000+ .45 loadings. Then there are the shorties like. 380 and 9mm Makarov.
The 9mm Parabellum and 7.62 Mauser rounds from WWI Germany were the zippy exceptions in their day. More recently, the 10mm group (10mm, .40) came onto the scene. The .38 Super was rescued from oblivion by the action pistol crowd, as it could be hotrodded to "major power factor" (bullet weight in grains x velocity in fps greater than 175000).
Some oddballs that never became popular: 9mm and .45 Win Mag, .41 and .50 Action Express, .44 AutoMag and its bottlenecked .357 and .41 siblings, and the "short rifle" sorts represented by the 5.7x28 being offered by FN.
Interestingly, the "baby AR" handgun cartridges are being promoted for close-quarters fighting, where they get to deliver most of their muzzle energy to the terminal medium (a.k.a. unlucky bastard).
cn
 
MHA1990

MHA1990

Member
I always thought faster lighter bullets were better for longer range, even though a heavier bullet is less likely to deflect it doesn't go as far relative to the lighter bullet(they both have the same airtime, but the faster bullets is faster, so... you do the math) and With a HP it won't go through (as easily)
 
cannabineer

cannabineer

Ursus marijanus
MHA1990 said:
I always thought faster lighter bullets were better for longer range, even though a heavier bullet is less likely to deflect it doesn't go as far relative to the lighter bullet(they both have the same airtime, but the faster bullets is faster, so... you do the math) and With a HP it won't go through (as easily)
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One of the keys to long-range performance is sectional density. This is a measure of weight v. area and corresponds in a simplistic way to the bullet's length. In rifle, the 6.5 mm and the .338 were sectional density kings, as was the .50 with its long long bullets. There are now VLD (very low drag) designs for most bore diameters, including the 220-to-250-grain offerings for the evergreen .30-bore. cn
 
srh88

srh88

Well-Known Member
cannabineer said:
One of the keys to long-range performance is sectional density. This is a measure of weight v. area and corresponds in a simplistic way to the bullet's length. In rifle, the 6.5 mm and the .338 were sectional density kings, as was the .50 with its long long bullets. There are now VLD (very low drag) designs for most bore diameters, including the 220-to-250-grain offerings for the evergreen .30-bore. cn
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i think of it as throwing a baseball or a tennis ball, which one can you throw harder
 
cannabineer

cannabineer

Ursus marijanus
srh88 said:
i think of it as throwing a baseball or a tennis ball, which one can you throw harder
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You can throw the tennis ball harder, but the baseball farther. They have very similar caliber, but the baseball is heavier. it's a pretty good illustration of the sectional density concept. cn
 
ANC

ANC

Well-Known Member
My favourite gun of all time is the 30-30 pistol. Big mofo of a gun that takes a single round that is almost the size of your finger.
A friend of mine had one with a scope, we could shoot waterbirds birds at 400m with it.
 
Kaendar

Kaendar

Well-Known Member
ANC said:
My favourite gun of all time is the 30-30 pistol. Big mofo of a gun that takes a single round that is almost the size of your finger.
A friend of mine had one with a scope, we could shoot waterbirds birds at 400m with it.
Click to expand...
Basically a hand cannon lol.
 
MHA1990

MHA1990

Member
cannabineer said:
One of the keys to long-range performance is sectional density. This is a measure of weight v. area and corresponds in a simplistic way to the bullet's length. In rifle, the 6.5 mm and the .338 were sectional density kings, as was the .50 with its long long bullets. There are now VLD (very low drag) designs for most bore diameters, including the 220-to-250-grain offerings for the evergreen .30-bore. cn
Click to expand...
Oh, that makes sense. Thanks so much cannabineer. SD=M/A, or m/d^2. The sectional density can then be used to calculate the ballistic coeffient which is SD/.519. A higher BC means that the bullet will fly longer and be bothered less by the wind. Higher SD means higher BC hence more flight.
 
GreatwhiteNorth

GreatwhiteNorth

Global Moderator
Staff member
ANC said:
My favourite gun of all time is the 30-30 pistol. Big mofo of a gun that takes a single round that is almost the size of your finger.
A friend of mine had one with a scope, we could shoot waterbirds birds at 400m with it.
Click to expand...
If you like the 30-30 you would love the .375 JDJ - its a .444 Marlin casing necked up down to .375" taking a 270gr slug dancing nicely at 2000 fps out of my Contender frame.
When I got mine JD Jones had a picture of himself on his brochure holding this pistol while leaning on his "Frontal brain shot" bull elephant. He reported complete skull penetration - most rifles won't do that !
And as an aside, with the correct powder the muzzle flash at night is quite the impressive show.
 
cannabineer

cannabineer

Ursus marijanus
MHA1990 said:
Oh, that makes sense. Thanks so much cannabineer. SD=M/A, or m/d^2. The sectional density can then be used to calculate the ballistic coeffient which is SD/.519. A higher BC means that the bullet will fly longer and be bothered less by the wind. Higher SD means higher BC hence more flight.
Click to expand...
The ballistic coefficient has a shape term; it's measured and not derived. Thus a 180-grain VLD spitzer will have a much higher ballistic coefficient than a 180-grain roundnose for the same bore. Their sectional density will be the same. cn
 
cannabineer

cannabineer

Ursus marijanus
GreatwhiteNorth said:
If you like the 30-30 you would love the .375 JDJ - its a .444 Marlin casing necked up down to .375" taking a 270gr slug dancing nicely at 2000 fps out of my Contender frame.
When I got mine JD Jones had a picture of himself on his brochure holding this pistol while leaning on his "Frontal brain shot" bull elephant. He reported complete skull penetration - most rifles won't do that !
And as an aside, with the correct powder the muzzle flash at night is quite the impressive show.
Click to expand...
I have an SSK Contender barrel in .45-70. Let me tell you, touching off a full-boat round (to levergun specs) in that thing will clear your sinuses. cn
 
GreatwhiteNorth

GreatwhiteNorth

Global Moderator
Staff member
cannabineer said:
I have an SSK Contender barrel in .45-70. Let me tell you, touching off a full-boat round (to levergun specs) in that thing will clear your sinuses. cn
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Is yours scoped ?
I'm running a 2 - 7 Burris in three TSOB rings.
The old girl is scary accurate at great range, but a solid (er) rest is a must.
 
Kaendar

Kaendar

Well-Known Member
Im buyin one, maybe 2 of these in the spring.
[video=youtube;62Er4VK4yA8]http://www.youtube.com/watch?v=62Er4VK4yA8[/video]
 
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