Forming 300 H&H?

Boomer454

Boomer454

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I almost feel a little silly asking this here, but its been bugging me.

A few weeks ago I was down at the local gun shop and got into a discussion with an older gentleman about reloading. At one point I was lamenting the shortage of .300 H&H brass. He told me in all seriousness that I should simply be able to neck up 7mm rem mag and fire form them with no troubles.

Now in my mind that case is to short to do that, but he said that it all irons out because of the long shoulder. And of course that he'd done it years ago.

I don't quite feel comfortable doing this my self, but wondered if it's possible. I figured someone here would know for sure.

Thanks in advance.
 
I'm pretty sure that's a stupid idea.
My uncle really wanted to shoot his new .300 so he resized .300 weatherby to H&H dimentions.
The cases had some wrinkles but worked ok.
 
I am not familiar with the 300 H&H so I looked it up in the Handloaders Manual of Cartridge Conversions. Here is what it had to say:

MAKE FROM: Factory or .375 H&H. Anneal case neck. F/L
size in .300 H&H die. Square case neck. Chamfer.
 
The guy saying to use 7 mag brass and shoot it is sort of correct. Because the case headspaces on the belt, it will chamber and fire. Be a very weird looking case when you're done though. Not really sure how you would get a 300 Wby down to 300 H&H, as the Wby is just a fire formed improved 300 H&H to begin with. Really, necking down 375 H&H cases is really the only good way to do it. I guess you could neck up 244 H&H cases but those are pretty hard to find (and my memory isnt even sure they are full length H&H). Way easier to just buy original H&H cases. - dan
 
Thanks guys. I've fire formed the H&H cases in my weatherby years ago I, so I I know about that.
I was moire asking about length. I was always sure you'd need the full length case, but this olkd timer was quite adamant 7mm rem, 300 and 338 win would work.

His arguement just sort if grew in my head until I had to ask.

Jeff270. Running the Wby case into the H&H die would be doable by likely took a lot of effort! If you annealed first not so bad maybe.

Clotho, I have that book arounfbhere somewhere. I should have just looked there first.

Dan. The original H&H cases seem to be pretty hard to come by lately. Personally I think 8mm rem mag would probably be a bit easier to neck down. Probably just as hard to find though.
 
Thanks guys. I've fire formed the H&H cases in my weatherby years ago I, so I I know about that.
I was moire asking about length. I was always sure you'd need the full length case, but this olkd timer was quite adamant 7mm rem, 300 and 338 win would work.

His arguement just sort if grew in my head until I had to ask.

Jeff270. Running the Wby case into the H&H die would be doable by likely took a lot of effort! If you annealed first not so bad maybe.

Clotho, I have that book arounfbhere somewhere. I should have just looked there first.

Dan. The original H&H cases seem to be pretty hard to come by lately. Personally I think 8mm rem mag would probably be a bit easier to neck down. Probably just as hard to find though.
 
Gatehouse said:
Before I started messing around with case forming, I'd spend a few hours on the telephone and email and a WTB ad on the EE here
Click to expand...

I haven't actually looked that hard yet. It was more just that the convo I had with this old guy got my mind working overtime.
I was sure I was right when I disagreed with him, but figured I'd throw the question out here anyway.
 
You most certainly can NOT make 300 H&H from 2.5-2.6" magnum cases. The one thing you cannot do in case forming is make them grow from a 1/4-3/8 of an inch. The old boy was pulling your leg, or my bet might be that he was confused with 308 Norma not 300 H&H.
 
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