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Bump up, or size down?
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I want to reload for a J-bore 8mm (.318" diameter grooves). Very few of the proper size bullets are available, and the few that are don't fit my needs and are also rather pricey.

So, would it be more satisfactory to take some conventional cup-and-core bullets for the .303 Brit (.312-.313 diameter) and bump them up to .318", or would it be better to take 8mm S-bore (.323") bullets and size them down to .318?

Looks like the diameter alteration is very nearly the same either way, but I'm guessing that one method might turn out better projectiles than the other.
 
Posts: 13263 | Location: Henly, TX, USA | Registered: 04 April 2001Reply With Quote
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I would size down


As usual just my $.02
Paul K
 
Posts: 12881 | Location: Mexico, MO | Registered: 02 April 2001Reply With Quote
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I was told that bump UP with jacketed bullets is safer than size down.

As, supposedly, the core and jacket can develop a gap. Supposedly the lead sizes down and stays sized down whereas the jacket having been sized down then expands, slightly, back out.

Personally I'd initially try unsized .312-.313 bullets and see what happens. They may well work as they are. We Brits made our .303s wide in the bore and a .318" Enfield isn't uncommon.
 
Posts: 6823 | Location: United Kingdom | Registered: 18 November 2007Reply With Quote
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You can find the Hornady interlocks in a couple of varieties <$25/100 and some Blems (<$16 - $23 per 100) for sale on Midwayusa.

It doesn't seems like the cost of the other size bullets and the labor of re-sizing them would be worth it.


Frank



"I don't know what there is about buffalo that frightens me so.....He looks like he hates you personally. He looks like you owe him money."
- Robert Ruark, Horn of the Hunter, 1953

NRA Life, SAF Life, CRPA Life, DRSS lite

 
Posts: 12754 | Location: Kentucky, USA | Registered: 30 December 2002Reply With Quote
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I take .416 down to .410 all the time. I've had no issues


As usual just my $.02
Paul K
 
Posts: 12881 | Location: Mexico, MO | Registered: 02 April 2001Reply With Quote
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quote:
Originally posted by Fjold:
You can find the Hornady interlocks in a couple of varieties <$25/100 and some Blems (<$16 - $23 per 100) for sale on Midwayusa.

I wasn't able to locate these. Can you post a link? The only .318 bullet I found was an out-of-stock Woodleigh.
 
Posts: 13263 | Location: Henly, TX, USA | Registered: 04 April 2001Reply With Quote
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quote:
Originally posted by enfieldspares:
I was told that bump UP with jacketed bullets is safer than size down.



I agree. You will end up with a more consistent product. Bullet manufacturers always swage up to size, never down.



AK-47
The only Communist Idea that Liberals don't like.
 
Posts: 10188 | Location: Tooele, Ut | Registered: 27 September 2001Reply With Quote
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i'm sure swaging is best. But you add the extra cost of higher price dies and a different press.

As I said I've had no issue with my .410s but I'm using them for water jugs and 125yd or less hogs.

I bow to the more experienced. coffee


As usual just my $.02
Paul K
 
Posts: 12881 | Location: Mexico, MO | Registered: 02 April 2001Reply With Quote
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quote:
Originally posted by Stonecreek:
quote:
Originally posted by Fjold:
You can find the Hornady interlocks in a couple of varieties <$25/100 and some Blems (<$16 - $23 per 100) for sale on Midwayusa.

I wasn't able to locate these. Can you post a link? The only .318 bullet I found was an out-of-stock Woodleigh.


That is weird. When I looked yesterday that had eight-ten different .318 bullets listed including two different Hornady Interlocks, two blem bulk packs, two Speer bullets, the Woodleigh's and some other bullets but now only the Woodleighs show up.

It may have been an old, cached page because I don't see where Hornady even makes a .318 bullet anymore.


Frank



"I don't know what there is about buffalo that frightens me so.....He looks like he hates you personally. He looks like you owe him money."
- Robert Ruark, Horn of the Hunter, 1953

NRA Life, SAF Life, CRPA Life, DRSS lite

 
Posts: 12754 | Location: Kentucky, USA | Registered: 30 December 2002Reply With Quote
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Swaging/bumping up works best. Drawing down often causes some of the lead core to extrude at the nose -- and sometimes enough to affect accuracy.


There is hope, even when your brain tells you there isn’t.
– John Green, author
 
Posts: 16669 | Location: Las Cruces, NM | Registered: 03 June 2000Reply With Quote
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Buffalo Arms has 4 weights: 150 to 200 grain.

http://www.buffaloarms.com/300...r-4178.aspx?CAT=4178 Go to page 4 and 5.

Hawk has two weights.

http://hawkbullets.com/masterList.html#/ Click Menu and .318.


Dave

In 100 years who of us will care?
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Just because they say you are paranoid doesn't mean they are not out to get you.
 
Posts: 899 | Location: Ammon, NC | Registered: 31 December 2013Reply With Quote
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Sounds like it's time to start casting. Big Grin


Have gun- Will travel
The value of a trophy is computed directly in terms of personal investment in its acquisition. Robert Ruark
 
Posts: 3831 | Location: Cave Creek, AZ | Registered: 09 August 2001Reply With Quote
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In this thread everyone for swaging. Two threads down everyone id fine with drawing down from .427 to .423.


As usual just my $.02
Paul K
 
Posts: 12881 | Location: Mexico, MO | Registered: 02 April 2001Reply With Quote
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I would have it rebored to a .338/06, 35 Whelen or 9.3x62....$175 well spent. My other option would be to find a 8mm f.323 barrel and index to your rifle..


Ray Atkinson
Atkinson Hunting Adventures
10 Ward Lane,
Filer, Idaho, 83328
208-731-4120

rayatkinsonhunting@gmail.com
 
Posts: 42210 | Location: Twin Falls, Idaho | Registered: 04 June 2000Reply With Quote
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Or just buy some of these and go shooting. Read the reviews.
https://www.midwayusa.com/prod...flat-nose-box-of-100


"The liberty enjoyed by the people of these states of worshiping Almighty God agreeably to their conscience, is not only among the choicest of their blessings, but also of their rights."
~George Washington - 1789
 
Posts: 2135 | Location: Where God breathes life into the Amber Waves of Grain and owns the cattle on a thousand hills. | Registered: 20 August 2002Reply With Quote
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quote:
Originally posted by Fury01:
Or just buy some of these and go shooting. Read the reviews.
https://www.midwayusa.com/prod...flat-nose-box-of-100

The possibility of using bullets for the .32 Win. Special occurred to me. They nominally measure .321, but according to the users the Hornady products actually are more like .320". Only .002" oversized isn't really a problem. As a matter of fact, I understand that if the throat will accept them -- and loads are kept mild -- that regular .323" bullets will work acceptably through a .318" barrel.

Too bad the deal fell through on the 8x60, however. Frowner
 
Posts: 13263 | Location: Henly, TX, USA | Registered: 04 April 2001Reply With Quote
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