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rechamber a 270WSM to 7mm WSM

 
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Old 06-09-2012, 06:25 PM
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rechamber a 270WSM to 7mm WSM

I'm a newbie to building up a custom or semi custom rifle so please forgive me if this is a dumb question.

I want my next rifle caliber to be 7mm WSM and I like the Vanguard S2, but they don't make it in 7 WSM. I've considered 270WSM, but want the better ballistics of the 7 WSM for LR. (Am I splitting hairs, considering I'm not in any formal competitions?)

The V S2 does come in 270 WSM, but I'm wondering what would have to be done, and if it is plausable to rechamber it to a 7WSM. Obviously a new barrel at around $350 + mounting for starters.

I've also read the articles on building a low cost LR rifle but it seems like I would have to buy more parts and integrate them; action, trigger assembly, bottom metal, barrel, stock, and what else? This sounds more expensive than a $485 + 350 + service to rechamber and rebarrel.

Thanks for any advice and not thowing dead squirrels at me!
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Old 06-09-2012, 06:29 PM
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Re: rechamber a 270WSM to 7mm WSM

The 7WSM is an excellent caliber. Why it is not more popular I have no idea. That said, my smith tells me that the ones he has built for many customers have reported short barrel life. So, keep that feedback in mind.
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Old 06-09-2012, 07:56 PM
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Re: rechamber a 270WSM to 7mm WSM

Quote:
Originally Posted by Derek M. View Post
The 7WSM is an excellent caliber. Why it is not more popular I have no idea. That said, my smith tells me that the ones he has built for many customers have reported short barrel life. So, keep that feedback in mind.
Thanks Derek. I have read about relatively shorter barrel life in 7mm WSM but I'm wondering if the same is true with 270WSMs. If so, I might as well go ahead and get a 270WSM and THEN rechamber to 7 when its burned out. That should give me 800+ rounds of practice before I move on up and farther out.
It seems the 7WSM is gaining popularity. Look on AccurateShooter; there are some good articles and links there.

This is harder to decide on than choosing between which sports car to buy! (not buyin one, just sayin')
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Old 06-09-2012, 10:01 PM
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Re: rechamber a 270WSM to 7mm WSM

A 270 cal should burn a tube as fast or faster than a 7mm. I have 1500 rounds through my big 7 now and it still shoots great. I will retube soon, as my gun has a factory on it.
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Old 06-09-2012, 10:02 PM
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Re: rechamber a 270WSM to 7mm WSM

Why not enjoy the better ballistics that the 270 WSM can bring to the table? Matrix ballistics bullets has two bullets that fit the LR application a 165 gr and 175 gr VLD with a g7 BC of .650+ and Berger is working a 170gr .703 BC bullet.
Best to start with the 165 which will stabilize with the slowest twist barrel. Barrel life runs about 1200 rounds.
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Old 06-09-2012, 10:57 PM
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Re: rechamber a 270WSM to 7mm WSM

Duck........Nuthin personal I just like throwing dead sqirrels

I want my next rifle caliber to be 7mm WSM and I like the Vanguard S2, but they don't make it in 7 WSM. I've considered 270WSM, but want the better ballistics of the 7 WSM for LR. (Am I splitting hairs, considering I'm not in any formal competitions?)
Yep your splitting hairs=The accuracy of the individual barrel will make a bigger difference than the BC of the 270 vrs 7 @ 600 yards and your wind reading ability will make a bigger difference @ 1000
The V S2 does come in 270 WSM, but I'm wondering what would have to be done, and if it is plausable to rechamber it to a 7WSM. Obviously a new barrel at around $350 + mounting for starters.
I bet your going to double the cost of the gun just to have a 7 vrs 270. Shoot the 270 out and REBARREL then??

I've also read the articles on building a low cost LR rifle but it seems like I would have to buy more parts and integrate them; action, trigger assembly, bottom metal, barrel, stock, and what else? This sounds more expensive than a $485 + 350 + service to rechamber and rebarrel.

Stop reading and srart shooting, not to be mean but your gonna find out relitivly quick that sporter weight V2 is tricky to shoot longrange with........

I've got a 7WSM varmint contoured barrel comeing for an old Savage action that already has a tunable trigger and suitable stock. I paid $350 for the gun years ago and shot out the 6.5-284 barrel than came with it, the barrel is a $174 prechambered/prethreaded Shaw that I'm betting/hopeing is MOA out to 1000??

Short barrel life for a compition gun? 99% of shooters will not truely shoot out a barrel

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Old 06-09-2012, 11:03 PM
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Re: rechamber a 270WSM to 7mm WSM

Quote:
Originally Posted by bigngreen View Post
Why not enjoy the better ballistics that the 270 WSM can bring to the table? Matrix ballistics bullets has two bullets that fit the LR application a 165 gr and 175 gr VLD with a g7 BC of .650+ and Berger is working a 170gr .703 BC bullet.
Best to start with the 165 which will stabilize with the slowest twist barrel. Barrel life runs about 1200 rounds.
The .270 doesn't bring better ballistics to the table.

Even staying with the Matrix bullets their hunting VLD's in .284 have BC's of 168gr-.713 and 180gr .807.

As for barrel burners any of these are going to burn barrels quickly if you run max weight bullets and max charges to maximize velocity.

Back off of the maximums a bit and barrel life is extended greatly.
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