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Overbore???

 
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  #1  
Old 07-03-2003, 12:03 AM
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Overbore???

Hello all,

1st time posting here. Hope you can answer some questions.

I've been told that the 300winmag is overbore for 30 cal & will burn a barrel out sooner than a 308 win (which is considered a very efficient cartridge). If this is the case, can I expect to get better barrel life from a 338 RUM when compared to a 300 RUM? Is the 338 RUM considered overbore for a 338 caliber? What is the most efficient cartridge for 338 caliber?

Thanks in advance.

Chris.
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  #2  
Old 07-03-2003, 05:57 AM
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Re: Overbore???

I wouldn't consider the Win Mag overbore, but... comparing barrel life then it kind of is. The 308 is good for 5-10000 rnds while the 300 last around 2000.
The 300 RUM is definitely overbore. The 338 RUM is on a slightly shorter case than the 300 RUM. I believe the 338 Win Mag case is also shorter than the 300 Win Mag case.
The 338 Winn would probably be the least "overbore" but for all out kick butt performance I like the 338 Lapua with 300 Matchkings.
None of these will last as long (barrel life) as a 308.
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  #3  
Old 07-03-2003, 12:37 PM
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Re: Overbore???

Cynical you don't see that many 338s in benchrest because you have the 6.5-284!!!
See the question is why torture yourself when you can win with the smaller caliber. You will find that many benchrest shooters are blitz type shooters that finish their strings in a rapid manner. This is easier with the smaller gun. That being with the idea that if you shoot fast you get the same wind by not letting the conditions change within your string. That is not to say that you couldn't win with an accurate 338. When it comes to hunting and killing something at long distance then of course the 338 will shine. You will have to decide what is important to you. If you shoot benchrest versus hunt. Shot placement vs caliber vs how far you plan to hunt. A lot of smiths frown on the Lapua round in a Remington.
Good Luck in your venture!
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Old 07-03-2003, 03:40 PM
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Re: Overbore???

H-Bar,

The big issue for me was barrel life & not having to buy too many of them. I've heard that the 6-284 is really hard on barrels & is considered by a few varmint hunters I know as a very overbore cartridge. I don't know much about the 6.5-284 but can't imagine that .5mm will make that big of a difference.

Bottom line is, I'm cheap & impatient. I'd rather beat up my shoulder than hammer my wallet every 1000-1500 rds or wait a year to have my new barrel installed.

On a different note, do you know how many yards a 77-80 gr Matchking will travel before it goes sub-sonic when fired from a 223 rem w/a 20" barrel? I know they were designed for the 600 yard line, but wonder if they're good for beyond. Just asking cause of your name.

Thanks for the input.

Chris.
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Old 07-03-2003, 04:46 PM
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Re: Overbore???

Chris,
I'm having a 30/338 Lapua Imp. done right now. My brother has a 338/378Wby, and I'm having a 338 Lapua Imp. done this fall... these are all on 700 actions.

The reamer I designed has a .405" neck length, suppose to eliminate the throat errosion problems, as the burning powder is redirected from the shoulder angle off the neck, not the throat, and isn't "sandblasting" the throat near as hard. Overheating the throat will still make things relatively worse no matter what, but we'll see how long things last.

S1 likes the Win M-70 for the 338 Lapua size cases, the integral recoil lug does make it simpler for a switch barrel, although the 700's lug can be set up pinned... either or.
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  #6  
Old 07-03-2003, 08:29 PM
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Re: Overbore???

Without starting an argument, it is my and GA Precision's opinion that the 700 will hold the 338 Lapua no problem.
Anyway, the .338 will outperform the 6.5 in the wind. High BC is important, as is velocity but mass is also a very big part of the equation.
Which brings us to your next question of what difference .5 mm would make by going to the 6-284. Well the answer is weight. The heaviest 6mm other than maybe some customs is the 107 MK. 6.5mm is the 142 gr MK.
That extra weight will save your butt...
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  #7  
Old 07-03-2003, 08:34 PM
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Re: Overbore???

Brent,

Please explain. How does a .405" neck length reduce throat errosion? How many rounds do you expect to get out of a barrel w/a modified neck versus the standard cartridge? Is this what's considered an "improved" cartridge? Do you have to get custom made dies?

Thanks to you and the rest for the education & putting up w/the newbie questions.

Chris.
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