Ballistics Info Wanted

[kinetic711]

I want to get a 12.5" Grizzly Shotgun. Does anyone know the ballistics info firing slugs from a 12.5" barrel compared to a 20" or longer? The slugs I have are 12g, 2.75", 1oz, 1700FPS. Is it correct to assume the shorter barrel will not allow time enough for all of the powder to burn, hence, lower FPS and impact energy at 25yds, 50yds, 100yds?

 

[FLHTCUI]

I do not think most people who buy these guns really are concerned with velocity.
That is just my humble opinion this fine morning.
Rob

 

[cie]

Brobee did some research on this some time ago. Perhaps you can pm him for some results, or maybe he would consider reposting?

 

[kinetic711]

I do not think most people who buy these guns really are concerned with velocity.
That is just my humble opinion this fine morning.
Rob

I agree with you. In my case, I am getting tired of being charged by bears while working in the bush. I am looking for something compact that is still capable of delivering an attitude adjustment if the need arises.

Brobee did some research on this some time ago. Perhaps you can pm him for some results, or maybe he would consider reposting?

Thanks for the suggestion, pm sent.

 

[Brobee]

- Remington reduced recoil slug fired out of an 18 inch barreled remington 870.
- 30 inches total penetration into calibrated ballistic gelatin

- Remington reduced recoil slug fired out of a 14 inch barreled remington 870.
- 27.5 inches total penetration into calibrated ballistic gelatin

- Winchester standard foster styled high velocity slug fired out of an 18 inch barreled remington 870
- 17 inches total penetration into calibrated ballistic gelatin
- slug pancaked into a thin disk about the size of a toonie, thus greater deflection and less penetration.
- Would not want to use this slug for bear protection

- Brenneke R10 fired out of an 18 inch barreled remington 870
- 25.5 inches total penetration into calibrated ballistic gelatin
- this is the slug I would want to use for bear protection (in the absence of a rifle)

Cheers,

Brobee

 

[kinetic711]

- Remington reduced recoil slug fired out of an 18 inch barreled remington 870.
- 30 inches total penetration into calibrated ballistic gelatin

- Remington reduced recoil slug fired out of a 14 inch barreled remington 870.
- 27.5 inches total penetration into calibrated ballistic gelatin

- Winchester standard foster styled high velocity slug fired out of an 18 inch barreled remington 870
- 17 inches total penetration into calibrated ballistic gelatin
- slug pancaked into a thin disk about the size of a toonie, thus greater deflection and less penetration.
- Would not want to use this slug for bear protection

- Brenneke R10 fired out of an 18 inch barreled remington 870
- 25.5 inches total penetration into calibrated ballistic gelatin
- this is the slug I would want to use for bear protection (in the absence of a rifle)

Cheers,

Brobee

Thanks for the info. Very interesting and informative.

 

[just having some fun]

Winchester standard foster styled high velocity slug fired out of an 18 inch barreled remington 870
- 17 inches total penetration into calibrated ballistic gelatin
- slug pancaked into a thin disk about the size of a toonie, thus greater deflection and less penetration.
- Would not want to use this slug for bear protection

I am in a different of opinion
this slug transfered all if its energy in 17" So I would be using it !!

slug pancaked into a thin disk about the size of a toonie

--so large internal wound channel and even a chance of a through shot (from side) --front shot would still cause lots of damage

not sure what would happen with any slug from any manufacture if you did a front on head shot on a bear-- too many variables but i would hope it would drop in its tracks, (with one) but if it was attacking/ charging i would empty the mag if family was in danger

 

[Brobee]

Guess we agree to disagree then. My opinion is, when starting with a projectile diameter of approximately 3/4 of an inch, penetration is more important than expansion. A close second in importance is lack of deflection in terminal trajectory.

edited to add: imagine shooting Mr. Grizzly in the onside shoulder with a slug that basically pancakes flat, transferring all that energy (which is, by the way, the same amount of energy imparted to your shoulder via recoil) into a horrific yet superficial flesh wound in his massive shoulder muscles. You better hope you can keep shooting because nothing vital's been damaged, meaning that there's nothing really stopping that bear (other than a disadvantaged leg) from pressing on with whatever that bear was doing when you felt it was time to let him have it. If it's a gun for dangerous game my personal belief is that straight, deep penetration is the way to go.

Ymmv

Brobee