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Poll: Better off using a 300 RUM or 7mm 180 bergers at 3000 fps
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Better off using a 300 RUM or 7mm 180 bergers at 3000 fps

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300 RUM or 7mm with 180 bergers at 3000 fps

 
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  #29  
Old 11-03-2011, 12:26 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

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Originally Posted by IdahoCTD View Post
The difference in a 24" barrel between a 7RM and 7 STW is very little. When you go to the longer barrels is where the 7STW starts to pull away. So I'd look at what barrel length you want to tote around and decide which case from that. For me, if I was in your shoes and already had dies etc., you'd have to get up to about 27-28+" before I would go to a 7STW shooting heavy bullets.
26" works great for me, but 162gr is the highest weight I see any need to shoot.


I've shot it side by side with the 7mm mag and it's a clearly superior caliber.
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  #30  
Old 11-03-2011, 05:29 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

We've rechambered 7RM's to 7 STW in 24" barrels and the difference is less than 100fps. A lot of times it's closer to 50. At 26" the STW can be quite a bit faster and at 28+" it's stretching it's legs. The more powder through a given bore the more it benefits from a longer barrel.
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  #31  
Old 11-03-2011, 08:39 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

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Originally Posted by IdahoCTD View Post
We've rechambered 7RM's to 7 STW in 24" barrels and the difference is less than 100fps. A lot of times it's closer to 50. At 26" the STW can be quite a bit faster and at 28+" it's stretching it's legs. The more powder through a given bore the more it benefits from a longer barrel.
Comparing the same powders that will certainly be true. However you can also use a faster burning powder to accomplish pretty much the same thing.
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  #32  
Old 11-03-2011, 10:51 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

A slow powder in a 7RM is generally a faster powder for a 7STW. So comparing the same powder, no matter what it is, makes it already faster in the STW. If you go even faster you can get some velocity back but a lot of times you lose accuracy. There is definately a point of diminishing returns when you go to shorter barrels in high capacity cases.

I know 7 STW's quite well. I currently have 3 of them and have built 10+ for myself and several for friends over the last 20 years. I've shot bullets from 120-180gr in 24" to 30" barrels. 130gr Sierra Single Shot pistol bullets and 180gr JLK's/Bergers do amazing things to rockchucks, squirrels, crows, coyotes, etc. It and a couple different .30 caliber magnums use to be my go to rockchuck guns. I personally wouldn't build one in a 24" barrel again. I'd build something like a 7mm-.300 Win Mag. or a standard 7RM.
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  #33  
Old 11-03-2011, 10:57 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

Quote:
Originally Posted by IdahoCTD View Post
A slow powder in a 7RM is generally a faster powder for a 7STW. So comparing the same powder, no matter what it is, makes it already faster in the STW. If you go even faster you can get some velocity back but a lot of times you lose accuracy. There is definately a point of diminishing returns when you go to shorter barrels in high capacity cases.

I know 7 STW's quite well. I currently have 3 of them and have built 10+ for myself and several for friends over the last 20 years. I've shot bullets from 120-180gr in 24" to 30" barrels. 130gr Sierra Single Shot pistol bullets and 180gr JLK's/Bergers do amazing things to rockchucks, squirrels, crows, coyotes, etc. It and a couple different .30 caliber magnums use to be my go to rockchuck guns. I personally wouldn't build one in a 24" barrel again. I'd build something like a 7mm-.300 Win Mag. or a standard 7RM.
"Point of Diminishing Returns" is somethign I see throughout the 7's. You can just push them so fast and when you pass that point it seems like no matter how much more powder you put in there you just aren't getting much in return.

It doesnt' seem to much matter if you are talking .280 Rem or 7 Rum, they all seem to be that way.

I like the 26" for a rifle I'm going to have to carry, but when I rebuild my current 7STW It's losing the magnum sporter taper 26" and moving up to either a 28 or 30" in a Sendero Taper.

It does get to be a PITA though finding cases to fit them... .
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  #34  
Old 11-03-2011, 11:06 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

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Originally Posted by WildRose View Post
"Point of Diminishing Returns" is somethign I see throughout the 7's. You can just push them so fast and when you pass that point it seems like no matter how much more powder you put in there you just aren't getting much in return.

It doesnt' seem to much matter if you are talking .280 Rem or 7 Rum, they all seem to be that way.

I like the 26" for a rifle I'm going to have to carry, but when I rebuild my current 7STW It's losing the magnum sporter taper 26" and moving up to either a 28 or 30" in a Sendero Taper.

It does get to be a PITA though finding cases to fit them... .
And it's a PITA to pack them on a motorcycle into deer country too . Hell it's a PITA to pack a 30" barrel over your shoulder. They tend to snag on everything you try to walk under.
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  #35  
Old 11-03-2011, 11:14 PM
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Re: 300 RUM or 7mm with 180 bergers at 3000 fps

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Originally Posted by IdahoCTD View Post
And it's a PITA to pack them on a motorcycle into deer country too . Hell it's a PITA to pack a 30" barrel over your shoulder. They tend to snag on everything you try to walk under.
That's one reason I carry everything barrel down whether it's slung over my back or across my chest... .

Anyway you do it though you are right. The added length is just a PITA any way you are transporting them.
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