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 Gold Dot .38 GDHP vs. GDHP-SB ammo. 
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 Post subject: Gold Dot .38 GDHP vs. GDHP-SB ammo.
PostPosted: Wed Oct 29, 2008 7:34 pm 
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Joined: Thu Mar 13, 2008 7:27 pm
Posts: 144
Hi,
I went and bought Gold Dot Personal Protection .38 ammo (Part #23720)for by S&W 642-- They of course also make .38 ammo. for Short Barrell use--

Balastics for both are:

GDHP Muzzle Velocity is 945 - Muzzle Energy is 248

GDHP-SB Muzzle Velocity is 860 - Muzzle Energy is 222

The differance is trajectory is only like 1/2 inch at 50 yards.

So is what is the big differance with the short barrel ammo.? Is it worth the price of me going out and getting a box of it?

I also have been using 158 grain wadcuttters for pratice as they are a joy to shoot over even .38 ball ammo. and a lot cheaper to buy-- With the 642 how often can I pratice with the +P rounds before I have to start to be concerned about wear and tear on my pistol etc.--

Thanks

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PostPosted: Wed Oct 29, 2008 7:47 pm 
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My understanding is the SB load uses a powder that will give you less muzzle flash. It may also use a faster burning powder to try and compensate for the short burn time in the short tube.

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PostPosted: Wed Oct 29, 2008 8:01 pm 
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Thanks! that was fast-- See ya tomorrow at Keirans

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PostPosted: Thu Dec 18, 2008 9:56 am 
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I did a quick check and didnt find how the ballistic where rated on each round.
ie Was the round that clocked at 945fps shot out of a 2" snub or a six inch closed breech test barrel, If a test barrel was used I doubt you would achieve the same from a 2" revolver same goes for the SB round make sure your compareing apples to apples.


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PostPosted: Thu Dec 18, 2008 10:04 am 
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In looking into the post ballistics by the inch they show 38 GDHP 135gr but dont specify which one at 756fps out of a 2" barrel :o and that was a single shot barrel so no loss from cylinder gap.


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PostPosted: Thu Dec 18, 2008 10:19 am 
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This is some data from my 642. Sorry, the formating from the Excel didn't copy well. I think you can figure it out.

I have the GDHP short barrel I will test at some time. I also will be testing Remington and Buffalo Bore 158 gr Lead SWC. Both standard and +P. These are the old "FBI" loads.

38 Special SW 642 1 7/8 " Barrel (1-5-2007 Temp. 35 ºF)

Federal 158 gr. Jacketed Hollow Point Hydra Shok (5 rds.)

Velocity (mean fps) SD Power Factor Energy (ft-lbs) High Low ES
848.4 27.8 134.0 252.5 878.0 819.0 59.0

CCI Blazer 158 gr. Lead Round Nose (3522) (5 rds.)

Velocity (mean fps) SD Power Factor Energy (ft-lbs) High Low ES
673.2 17.5 106.4 159.0 692.4 650.0 42.4
(Listed on box) 755.0 200.0

Remington UMC 158 gr. Lead Round Nose (L38S5) (5 rds.)

Velocity (mean fps) SD Power Factor Energy (ft-lbs) High Low ES
696.5 9.6 110.0 170.2 706.9 682.2 24.7

Winchester 158 gr. Lead Round Nose (White Box) (Q4196) (5 rds.)

Velocity (mean fps) SD Power Factor Energy (ft-lbs) High Low ES
656.2 14.5 103.6 151.1 675.3 642.6 32.7

Reloads: Light 140 gr. Lead SWC (Dwyer's) (10 rds.)
3.0 gr. 231 1.485 OL WSP Primers

Velocity (mean fps) SD Power Factor Energy (ft-lbs) High Low ES
529.6 27.1 74.1 87.2 578.3 493.7 84.6
522.6 30.1 577.7 477.4 100.3


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