338-300 Win Mag

[thesheepdog]

Who where has a 338-300 Win Mag (300 Win necked up to 338)?

I heard about this cartridge recently and am intrigued. All the benefits of a 338 Win Mag and then some:
Longer neck and more case capacity.

If you have information for me please PM me or email so I can ask you some questions.

Thank you.



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[Dirty D]

Read up on the 338/375 Ruger, long neck, tons of case capacity and no belted case.

 

[gewehr]

Or 330 Dakota, no seriously I had the same idea a year ago and eventually went with the 330 Dakota because dies are available. The 338-300 win mag is a heck a round to look at but until dies become easier to get I would steer clear


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[DAVETOOLEY]

338-375 +1 80% of the performance of a Lapua at 60% of the cost. What's not to like?

 

[thesheepdog]

Or 330 Dakota, no seriously I had the same idea a year ago and eventually went with the 330 Dakota because dies are available. The 338-300 win mag is a heck a round to look at but until dies become easier to get I would steer clear


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Dies are available. The reason it intrigues me, is the fact it uses readily available 300 Win brass. My 338 Edge does not have this benefit.

 

[garandman]

I went with 338 Norma Mag. 100% of the performance of 338 Lapua at 75% of the cost.


I steered clear of the 300WM due to the belted cases.

 

[leadbullet]

might as well do a 338 edge.

 

[thesheepdog]

might as well do a 338 edge.

If you would read my post above, I already have a 338 Edge.


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[BravoSierra]

Belted cases? Why is that bad? Set to headspace just like any other round and use a collet sizer right?

 

[thesheepdog]

Belted cases versus non-belted and one being better than the other is just a myth. I don't get worked up over it. I have both and can't tell a difference in accuracy or case life.


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[DAVETOOLEY]

Back in the day when all you guys were still in diapers we didn't have much to work with in the ELR game. Custom actions, you could count on one finger our options for large cases. Cartridge cases, just about the same. 416 Rigby, 30-378 Wby and the 404 Jefferys. Pre Lapua, pre RUM pre anything big. Finding 416 brass was hit or miss. It was available maybe once a year. We went with the 30-378. That's where we had issues with the belt. It is far enough forward that part of it is not supported by the case head. It's not that extreme in standard .532" cases. We even went so far as to have reamers and dies made without the belt. We turned the belts off the brass. Then I moved on to the 404 case, present day RUM. Given enough firings you could still have minor extraction issues with a .532" based case. The front of the belt is .220" from the case head. I consider most sidewalls thin and unsupported around .180" from the head which leaves the area directly in front of the belt at .220" even thinner and sizing dies have a radius on the corner and don't size all the way to the belt. Also the belt itself will expand over time. Minor issue but it is there if you shoot a piece of brass often enough.

 

[Dirty D]

Back in the day when all you guys were still in diapers we didn't have much to work with in the ELR game. Custom actions, you could count on one finger our options for large cases. Cartridge cases, just about the same. 416 Rigby, 30-378 Wby and the 404 Jefferys. Pre Lapua, pre RUM pre anything big. Finding 416 brass was hit or miss. It was available maybe once a year. We went with the 30-378. That's where we had issues with the belt. It is far enough forward that part of it is not supported by the case head. It's not that extreme in standard .532" cases. We even went so far as to have reamers and dies made without the belt. We turned the belts off the brass. Then I moved on to the 404 case, present day RUM. Given enough firings you could still have minor extraction issues with a .532" based case. The front of the belt is .220" from the case head. I consider most sidewalls thin and unsupported around .180" from the head which leaves the area directly in front of the belt at .220" even thinner and sizing dies have a radius on the corner and don't size all the way to the belt. Also the belt itself will expand over time. Minor issue but it is there if you shoot a piece of brass often enough.

And this is what makes the Hide a great place, 1st hand quantifiable observations from someone who has actually BTDT.

 

[thesheepdog]

My 338-300 with 300gr Bergers clocking 2650fps

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[supercorndogs]

Belted cases versus non-belted and one being better than the other is just a myth. I don't get worked up over it. I have both and can't tell a difference in accuracy or case life.


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No, one requires more tooling and time to load, when you have to address the buldge you get just above the belt.

 

[BurnOut]

The 338-300 WM actually has a shorter neck than the 338 WM; this is because the shoulder of the 300 WM case is blown forward (relative to the 338 WM) but the length of the case is the same. Consequently, the 300 WM (and therefore the 338-300 WM) has a touch more case capacity vs. the 338 WM.

I am in the process of having a 338 WM put together, and put a LOT of thought into the 338-375 Ruger... but decided that I wanted to have the option to run factory ammo in a pinch. Regarding the belted case "problem", I purchased the Larry Willis collet die (which can obviously be used on any case in the "family")... so, problem solved.

The problem that remains is getting enough of the right powder into the case to get the projectiles I want to run (Berger 250 EH) up to the speed I want (2800-2900 out of a 26" barrel) while still allowing for a COAL of less than 3.45". I was planning on using H4831, but it's too bulky... so I have been spending a LOT of time the last week or so looking over powder burn rate and bulk density charts. I think I found a powder (Ramshot Hunter) that's going to get me where I want to go, but I won't be able to know until I get the barreled action back from the 'smith. If it can't be done with the Bergers, I may fall back to the new Hornady 230 ELD-X.

 

[hseII]

The 338-300 WM actually has a shorter neck than the 338 WM; this is because the shoulder of the 300 WM case is blown forward (relative to the 338 WM) but the length of the case is the same. Consequently, the 300 WM (and therefore the 338-300 WM) has a touch more case capacity vs. the 338 WM.

I am in the process of having a 338 WM put together, and put a LOT of thought into the 338-375 Ruger... but decided that I wanted to have the option to run factory ammo in a pinch. Regarding the belted case "problem", I purchased the Larry Willis collet die (which can obviously be used on any case in the "family")... so, problem solved.

The problem that remains is getting enough of the right powder into the case to get the projectiles I want to run (Berger 250 EH) up to the speed I want (2800-2900 out of a 26" barrel) while still allowing for a COAL of less than 3.45". I was planning on using H4831, but it's too bulky... so I have been spending a LOT of time the last week or so looking over powder burn rate and bulk density charts. I think I found a powder (Ramshot Hunter) that's going to get me where I want to go, but I won't be able to know until I get the barreled action back from the 'smith. If it can't be done with the Bergers, I may fall back to the new Hornady 230 ELD-X.

Any Luck?

 

[BurnOut]

Any Luck?

None whatsoever with the Bergers. As it has turned out, the barrel on my 338 WM absolutely hates the Bergers, at least with every load I have tried. I was able to get the speed up, but they never grouped for me... closer to a pattern (think shotgun) than a group. I should note that there's nothing wrong with the projectiles, as I was able to get them to group MOA or slightly less (with no load development) out of a 338LM Improved right at 3k FPS, so there's just something about my 338 WM that didn't agree with them.

I am currently working with the 230 gr ELD-X and seeing close to 3k FPS with RL17 (69.5 gr gets me 2980 FPS avg out of a 26" 9.4-twist barrel); trying to fine tune the charge and seating depth to get the groups down.

 

[hseII]

None whatsoever with the Bergers. As it has turned out, the barrel on my 338 WM absolutely hates the Bergers, at least with every load I have tried. I was able to get the speed up, but they never grouped for me... closer to a pattern (think shotgun) than a group. I should note that there's nothing wrong with the projectiles, as I was able to get them to group MOA or slightly less (with no load development) out of a 338LM Improved right at 3k FPS, so there's just something about my 338 WM that didn't agree with them.

I am currently working with the 230 gr ELD-X and seeing close to 3k FPS with RL17 (69.5 gr gets me 2980 FPS avg out of a 26" 9.4-twist barrel); trying to fine tune the charge and seating depth to get the groups down.

I wonder how the 250 Accubond or Hammer Hunters would do?

I hate that it doesn’t do Bergers.

 

[TorF]

Try Nosler 265gr Accubond Longrange in 338winmag.
BC .778, supersonic to app 1800yds with std "diesel" load of 2750fps.
This combo should even have a good barrellife. 3000 rounds?