Search found 6 matches

by WildBill
Mon Jul 02, 2012 6:46 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

The Annoyed Man wrote:
pfgrone wrote:
WildBill wrote:I think that after all of your calculations you will come to the conclusion that you need a larger caliber. ;-)
I knew someone could not keep from suggesting a larger caliber. When my 70 year old hands with arthritis finally could no longer take the recoil from my dearly loved 38 Spl snubby, I downgraded to 380. By the time my hands were 75 years old, I had tried 4 different 380's and couldn't grip them tight enough to keep from getting stove pipes, etc.. So I am now down to a 32 acp and glad I can shoot it. In five more rears, I may be shooting rimfires. We do what we can.
Hi Paul,

I wonder if you might not be better served by a pistol shooting .22 LR or .22 Magnum? I can certainly understand how arthritis can limit your choices. I use different carry alternatives these days because of my back, and I tend to carry lighter pistols than before too. But the reason I mention .22 LR is that it actually has pretty decent penetration for its caliber, and you wouldn't have to deal with painful recoil at all. And I don't know that it is any less effective than .32 would be in most defensive applications. I could be wrong, but that's what comes to mind.

Just a thought. And I meant no disrespect with my "P" joke (above).
:iagree: I am also a revolver fan. If it's the recoil that you can't handle, rather than the trigger pull, there are some nice .22LR revolvers available. I believe that there is one that holds nine rounds.

P.S. People tend to forget that recoil is a function of the weight of the pistol vs. the weight of the bullet x velocity [momentum] rather than muzzle energy. Also the perceived recoil is a function of the grip area. .32ACP guns tend to be very light weight and thin.

The shape of the grip also effects perceived recoil. In my experience, a S&W Model 29 .44 Mag hurts a lot more than a .44 Mag Ruger Blackhawk.
by WildBill
Mon Jul 02, 2012 4:21 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

The Annoyed Man wrote:
pfgrone wrote:AndyC: Is it muzzle energy that determines whether a particular load is +P? If so, what would be the point at which a 32acp be classified as +P?
The question is more along the lines of, "what would be the point at which a 32acp [would] be classified as just plain P?" :mrgreen:
Or a -P. ;-)
by WildBill
Mon Jul 02, 2012 4:20 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

pfgrone wrote:Oops, "goldenloki.com reports 32acp S&B 73 gr. JHP as 135 ft/lbs out of a Kel-Tec P-32 with 2.7" bbl." My bad, the bullet is FMJ - not that it makes any difference to the information I was seeking.
I think that after all of your calculations you will come to the conclusion that you need a larger caliber. ;-)
by WildBill
Mon Jul 02, 2012 4:13 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

Dan20703 wrote:Pressure is what determines the +P rating.

I don't think there is a SAAMI +P standard for .32 ACP.
:iagree:
by WildBill
Mon Jul 02, 2012 4:06 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

pfgrone wrote:AndyC: Is it muzzle energy that determines whether a particular load is +P? If so, what would be the point at which a 32acp be classified as +P?
The pressure generated upon firing determines if it is +P. The ammo manufacturer will label it so. Here are some for velocity and energy numbers for .32ACP +P ammo from Buffalo Bore. They are around 220 ft/lbs.

http://www.buffalobore.com/index.php?l= ... tail&p=132" onclick="window.open(this.href);return false;
by WildBill
Mon Jul 02, 2012 2:06 pm
Forum: General Gun, Shooting & Equipment Discussion
Topic: Muzzle Energy question
Replies: 20
Views: 2224

Re: Muzzle Energy question

pfgrone wrote:Situation:
New 32acp Beretta 3032 w/ 2.4" bbl. came with printed warning not to use loads exceeding 130 ft/lbs.
goldenloki.com reports 32acp S&B 73 gr. JHP as 135 ft/lbs out of a Kel-Tec P-32 with 2.7" bbl.

Questions:
Is the reported 5 ft/lbs over the recommended max energy a significant enough difference that I should be concerned about damaging my Beretta?
Is muzzle energy purely derived from a formula of from actual tests of some kind?
Are muzzle energy calculations subject to a standard deviation?

Okay, you engineers/physicists, put your heads together and clear this up for me. Please. Thanks.
I don't think that 5 ft/lbs is enough to worry about. As you suspected kinetic energy measurements will show a certain deviation so a 5 ft/lb force won't be significant.

Muzzle energy can be easily calculated by multiplying the mass of the bullet times the bullet speed squared divided by 2.

KE = ½mv²

http://en.wikipedia.org/wiki/Muzzle_energy" onclick="window.open(this.href);return false;

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