.300 weatherby brass to .340 weatherby

HOSSONE

HOSSONE

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One thing I really enjoy about this hobby is always learning new things. I was chatting with a couple guys a work one of whom has a .300 Weatherby. We just had general conversation as the other guy involved had a .300 win mag and was putting a brake on it. I have a .340 Weatherby and it got me thinking I really didn’t know much about the .300 Weatherby so I started doing some reading and came across some info that .340 is just necked up .300. I was a little let down in myself that I didn’t know this fact and when you think about it makes perfect sense. I mentioned that to the guy today at work and asked him if he doesn’t reload and if he saves his brass. He said his uncle used to reload them for him but he is no longer able and he saves his brass. I offered to buy it off him and he said he would give it to me! So it was a good day…..free brass to learn something new and is perfect to play around with if I mess some up.

So does anyone have experience doing this? From what I read some guys say it’s easy peasy lube it up and let it rip and you can just use a regular .340 die and others say they made custom expanders with bigger tapper. I work in a machine shop so that’s not an issue for me. Any tips to get me started?
 
While I’ve not done that particular conversion is should be a relatively simple one. .30 to .33 cal isn’t a huge jump. A tapered expander may help but depending on the die the factory one might work just fine. A heavier duty lubricant like imperial sizing wax will make things easier and if you have the capability I would anneal the fired brass first.
 
I realize it’s not the same caliber, but same jump going from 30/06 to 338/06. Did that in one pass with lubed case necks and RCBS die.
Also did 270 to 338 in one pass just to see. They worked fine when fire formed.
300 Bee to 340 should be absolutely fine in one pass with standard expander I imagine. Assuming you have a solid mounted press and aren’t limp wristed. 😳
 
dtkb said:
I realize it’s not the same caliber, but same jump going from 30/06 to 338/06. Did that in one pass with lubed case necks and RCBS die.
Also did 270 to 338 in one pass just to see. They worked fine when fire formed.
300 Bee to 340 should be absolutely fine in one pass with standard expander I imagine. Assuming you have a solid mounted press and aren’t limp wristed. 😳
Click to expand...
lol…..it’s mounted pretty solid and even though I’ve lost a few lbs the last year I hope my 6’4” 230lb physique can handle it!
 
257hunter said:
While I’ve not done that particular conversion is should be a relatively simple one. .30 to .33 cal isn’t a huge jump. A tapered expander may help but depending on the die the factory one might work just fine. A heavier duty lubricant like imperial sizing wax will make things easier and if you have the capability I would anneal the fired brass first.
Click to expand...
I’ll definitely be running them through the anealer.
 
Being that you posted that you work in machine shop I would make an 8mm ( .323) expander and use that first then anneal before using the 338 expander. That would be a good way to avoid neck splits JMO
 
I shoot a 338 Edge which is a 300 RUM necked up. I’ve got a tapered expander ball and a mandrel but never use either one anymore. The run-outs are brutal on the intitial size up but are fine after fireing.

My current method is to load the RUM cases, then set a big old 300 gr SMK on the 30 Cal neck and ram it in. I get straighter ammo this way.
 
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