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Posted: 5/18/2020 4:00:25 PM EDT
Just wondering if anyone has tried this and what your results were.
Update: (sorry about the flipped pics, I don’t know how to fix that) So, they size down quite easily with a Lee .309 sizing die and Hornady OneShot spray lube. Pre  Attached FilePost  Attached File |
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Posted: 5/18/2020 4:49:03 PM EDT
[#1]
I've sized down Nosler FMJ bullets from .310 to .308 for 300blk using a RCBS bullet sizing die. Easy to do. I haven't sized Gold dots but can't imagine it would be any different.
Some don't bother to resize for 300blk, but I've read that accuracy is better. Haven't had a chance to fire the bullets I've resized through my 300blk pistol yet. A ladder load is waiting for the range to open up again. |
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Posted: 5/18/2020 6:17:07 PM EDT
[#2]
Sizing bullets to a smaller diameter is easy to do.
I use one of these, https://www.midwayusa.com/product/1018523537?pid=320865 Mounts in a single stage press, sizer screws in like a die and the other part goes into the shellholder spot. Cast or powder coated can be sized without lube, jacketed bullets use a little case lube.  Here I'm sizing .358 to .355. |
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Posted: 5/18/2020 6:45:50 PM EDT
[#3]
I have an NOE sizer and a Lee. I’m confident in either as far as sizing goes, just am not sure if the Gold Dot design will allow for it.
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Posted: 5/18/2020 8:53:04 PM EDT
[#4]
I'm out of TNT's to compare them to, but I remember them having a pretty similar profile to the Speer 125 TNT, and this is where I'd start for load data. Sizing them down a couple thousandths shouldn't be any issue. They should expand pretty well at .300 Blk velocity, though I don't know how they'd do once they've lost a little steam further out.
This one was fired from a 7.62x39 pistol. MV was about 2200 (fairly close to what I'd expect with the Blackout). Caught in wet pack at 50y. You may not get quite the same velocity, but I'd say the higher RPM (.300 blk usually has a much faster twist rate) might compensate for the slight decrease in velocity. 
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Posted: 5/18/2020 10:20:23 PM EDT
[#5]
Quote HistoryOriginally Posted By Naporter: I'm out of TNT's to compare them to, but I remember them having a pretty similar profile to the Speer 125 TNT, and this is where I'd start for load data. Sizing them down a couple thousandths shouldn't be any issue. They should expand pretty well at .300 Blk velocity, though I don't know how they'd do once they've lost a little steam further out. This one was fired from a 7.62x39 pistol. MV was about 2200 (fairly close to what I'd expect with the Blackout). Caught in wet pack at 50y. You may not get quite the same velocity, but I'd say the higher RPM (.300 blk usually has a much faster twist rate) might compensate for the slight decrease in velocity. https://www.AR15.Com/media/mediaFiles/468179/1A7A649E-827D-41E5-99DD-3C5EFBB97C0B-1073439.jpg Thank you. I think I’ll buy several boxes and try them out. I love the TNTs. I really think Speer needs to release a lighter weight 300 AAC GD. 300 AAC is such an easy reload. |
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Posted: 5/19/2020 8:40:26 AM EDT
[#6]
I've been sizing down a bunch of 310/311 bullets lately in a Lee die. They are all jacketed and come out to .3085" which is close enough.
Just a word to the wise, make sure you are using a tough press. I wouldn't want to attempt sizing down the jacketed bullets .003 on a hand press or anything like that. I've been using the Hornady wax (Imperial knock off) to size and it seems to work swimmingly. The bullets go in the wet tumbler with just water/Dawn/Lemishine for an hour and they're GTG. ETA - I've been getting crazy accuracy in 308 Win. out of some mil-surp bullets that shouldn't theoretically shoot that well. They never shot that well in a 7.62x39 that will shoot other bullets exceptionally well anyway... |
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Posted: 5/19/2020 9:28:54 AM EDT
[#7]
Quote HistoryOriginally Posted By lokifox: I've been sizing down a bunch of 310/311 bullets lately in a Lee die. They are all jacketed and come out to .3085" which is close enough. Just a word to the wise, make sure you are using a tough press. I wouldn't want to attempt sizing down the jacketed bullets .003 on a hand press or anything like that. I've been using the Hornady wax (Imperial knock off) to size and it seems to work swimmingly. The bullets go in the wet tumbler with just water/Dawn/Lemishine for an hour and they're GTG. ETA - I've been getting crazy accuracy in 308 Win. out of some mil-surp bullets that shouldn't theoretically shoot that well. They never shot that well in a 7.62x39 that will shoot other bullets exceptionally well anyway... Rockchucker. Should handle it, I hope. 
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Posted: 5/19/2020 11:34:24 AM EDT
[#8]
Quote HistoryOriginally Posted By lokifox: ETA - I've been getting crazy accuracy in 308 Win. out of some mil-surp bullets that shouldn't theoretically shoot that well. They never shot that well in a 7.62x39 that will shoot other bullets exceptionally well anyway... Perhaps the bullets are inconsistent in 310/311 diameter across the full bearing surface and after resizing become consistent at .3085. |
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Posted: 5/19/2020 12:40:42 PM EDT
[#9]
Quote HistoryQuoted: Rockchucker. Should handle it, I hope. |
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Posted: 5/19/2020 2:00:37 PM EDT
[#10]
Quote HistoryOriginally Posted By Blowout: Perhaps the bullets are inconsistent in 310/311 diameter across the full bearing surface and after resizing become consistent at .3085. Quote HistoryOriginally Posted By Blowout: Originally Posted By lokifox: ETA - I've been getting crazy accuracy in 308 Win. out of some mil-surp bullets that shouldn't theoretically shoot that well. They never shot that well in a 7.62x39 that will shoot other bullets exceptionally well anyway... Perhaps the bullets are inconsistent in 310/311 diameter across the full bearing surface and after resizing become consistent at .3085. Nope they're all pretty darn consistent. I should have said 310 and 311 bullets, I've been doing both. All I can think is exactly what you said though, the bearing surface is really squeezing down the bore in the 308 and providing better accuracy. The 7.62x39 barrel is from he who shall not be named here per rules, and is a properly made tack driver. |
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Posted: 5/19/2020 7:30:59 PM EDT
[#11]
Quote HistoryOriginally Posted By lokifox: Nope they're all pretty darn consistent. I should have said 310 and 311 bullets, I've been doing both. All I can think is exactly what you said though, the bearing surface is really squeezing down the bore in the 308 and providing better accuracy. The 7.62x39 barrel is from he who shall not be named here per rules, and is a properly made tack driver. I might have misunderstood.... did you resize the 310 and 311 to .3085 before loading a 308 round or just use the bullets unsized? Yeah, that's a good one. Too bad he's not making X39 bolts and barrels anymore. I would get those in a heartbeat. |
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Posted: 5/21/2020 11:59:11 AM EDT
[#12]
So, they size down quite easily with a Lee .309 sizing die and Hornady OneShot spray lube.
Pre Attached FilePost Attached File |
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