Gold Dots - Gun Hub
Gun Hub

Go Back   Gun Hub > Gun Hub Forum > Ammunition

Reply
 
LinkBack Thread Tools Display Modes
Old 04-21-2017, 04:40 PM   #1
Senior Member
 
Join Date: Sep 2005
Posts: 2,165
Gold Dots

The other day I noticed the LGS had some Gold Dot bullets available in .357. So, I grabbed a box of 125 gr and headed for the loading bench.

1. These bullets are designed for the .357 Magnum, if you want .38s, look for the short barrel version as they won't expand at .38 velocities.

2. When weighing bullets after expansion tests, I got some odd results. So, I weighed a bunch of bullets in the box. Weight variation runs 1.5 grs extreme spread. At least within my sample size.

3. Being curious, I also miked the bullets and discovered they were pretty uniform, but fat. 0.3577 inches. Give or take a ten thousandth. Surprising uniformity-probably from the forming die that creates the hollow point (OK, dish shape in this bullet.). That being the case, why the oversize OD?

OK, they're plated, so some variation in weight & diameter would seem reasonable, wonder how cup & core bullets compare. Well, Remington 125 gr SJHP varied a couple of tenths of a grain and miked a variation less than that with 0.357 inch max.

Now, none of this means they don't perform pretty much as advertised: great weight retention and good, if variable expansion. But the variations were surprising. Oddly, the lighter faster, bullet expanded 0.01 inch less. Possibly because of less momentum? (OK, I didn't test statistically significant numbers. May be just one of those things.) Also may explain why the primers were markedly flatter with the same powder charges as conventional bullets.
William R. Moore is offline  
Old 04-22-2017, 07:58 PM   #2
Junior Member
 
Join Date: Dec 2011
Location: AZ
Posts: 21
And those are as good as plated get.
noylj is offline  
Old 04-23-2017, 07:29 AM   #3
Senior Member
 
spwenger's Avatar
 
Join Date: Mar 2006
Location: Show Low AZ
Posts: 1,071
Just Guessing...

Quote:
Originally Posted by William R. Moore View Post
3. Being curious, I also miked the bullets and discovered they were pretty uniform, but fat. 0.3577 inches. Give or take a ten thousandth. Surprising uniformity-probably from the forming die that creates the hollow point (OK, dish shape in this bullet.). That being the case, why the oversize OD?
...but my guess is that the relatively thin plating allows the core to conform nicely to the rifling for good obturation and that Speer got the best results with that diameter.

As I understand it, The Gold Dot concept allows some pretty fine tuning with just a modification of one or two dies or punches, particularly the final punch that shapes the hollow cavity.
spwenger is offline  
 
Old 04-23-2017, 09:07 AM   #4
Senior Member
 
Join Date: Sep 2005
Posts: 2,165
Quote:
Originally Posted by noylj View Post
And those are as good as plated get.
Dunno about that. I've used thousands of Berry's and their dimensional specs appear much tighter. At least in 9mm. Conversion to plated in 9mm was seamless. Not the case in .45 ACP, but that appears to be a bullet tension issue. Possibly affected by tired brass.
William R. Moore is offline  
Old 04-23-2017, 08:03 PM   #5
Senior Member
 
Charlie Petty's Avatar
 
Join Date: Aug 2003
Posts: 6,962
I was at Speer when they were making Gold Dot. They plate lead slugs to the desired weight and then put them through two or three dies to size and form the nose and hollow point. The gold dot is just an artifact from poking the hollow point.

There were some accuracy issues at first which were resolved by "double striking" one of the size dies.

I've gotten very good accuracy with both 9mm and .45 gold dots and have no problem with them as duty ammo but would stick with cheaper plated for plinking/training/blasting ammo.
Charlie Petty is offline  
Reply

  Gun Hub > Gun Hub Forum > Ammunition

Thread Tools
Display Modes





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © 2002 - 2017 Gun Hub. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.