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Comments on HOT 7mm's

 
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  #1  
Old 04-02-2006, 01:03 PM
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Comments on HOT 7mm\'s

I'm tinkering with theidea of a LR rig and a hot 7mm was in the mix , called a couple old hunting buddies that I haven't talked to in several onths and one said that hes doing the same thing with a 30" barreled Wby that was a
30-378 making a 7-378 pac-nor has the reamer and is doing the work. His plan is to get a 180gr Berger VLD to 3600fps , I personaly don't think that is possible but maybe 3400 maybe more
Anyway I asked why not just a 7RUM or 7-338Imp but he is looking the most he can get.

Anyhow , what would the velocity differance be between the regular 7mmRUM and a 7mm-300RUM , is their enough differance in the case to warrent the extra work.
I was also thinking about a 7mm-300Dakota

Hell who knows maybe the 300RUM with a min cut chamber will be the best bet.

The rig would be for deer and elk out to 600-800yds but with as little wind doping as possible thats why I was thinking about the long 7mm bullets

What do you guys think?
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  #2  
Old 04-02-2006, 01:54 PM
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Re: Comments on HOT 7mm\'s

JD, there is no difference between the 7rum and a 7/300rum.it's the same case.if you're looking for killing power,build a 338 caliber.reason i say this is,i've compared bullet weight/vel/ with the same cases.with the rum case,a 7 will push a 200 gr bullet about 2900.it can go faster but that's a comfortable speed. a 300rum will shoot a 200 gr ball over 3200.but a 338 caliber will launch a 300 gr pill around 2900.all of these velocities are with the same parent case and barrel length.i don't want to start any arguments but i don't think the BC of the 200 wildcat is as good as the 300SMK.the 7 is harder to load for and barrel life is probably half of a 338.IMHO there is no range a 7 can hit harder than a 338.i would take a 30 over a 7 and a 33 over the 30.
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  #3  
Old 04-02-2006, 05:46 PM
hjl hjl is offline
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Re: Comments on HOT 7mm\'s

Hi,
What velocity do you think your mate can get with a 200 gn wildcat projectile in the 7-378?
It sounds interesting to me.
Regards
hjl
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  #4  
Old 04-02-2006, 07:16 PM
 
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Re: Comments on HOT 7mm\'s

[ QUOTE ]
all of these velocities are with the same parent case and barrel length.

[/ QUOTE ]

Excellent post, great info. Slight correction, the 7mm, 300, 375 RUM have all the same case, the 338 is .1" shorter (to allow for a wider array of bullet selections in factory chambering). I currently own two 300 RUMS, a 338 & 375 RUM. All but my factory Sendero sport Lilja 30 #8 contour - all guns have been worked over by Kirby (trigger job, custom stock, Holland QD brake, scope rail hole bored to #8-40) - All track drivers.
But I couldn't agree more with your assessment. The 338 RUM is the ultimate long range elk gun IMAO. The only minor improvement you could make; ream one to chamber the longer/cheaper/better 300 RUM brass.

I was going to add the 7mm RUM to my collection but my rocket scientist pal convinced me the 7mm RUM is too *over bore*, the case is ideal for the 338 and works well for the others, (sans the 7mm). I'll add a 7mm STW some day for my ultra long range deer/antelope gun.

I'll also add the 375 RUM is underrated. I'd pick up another 375 RUM before getting a 7mm RUM.

[ QUOTE ]
i don't want to start any arguments but ...the 7 is harder to load for and barrel life is probably half of a 338.


[/ QUOTE ]

I disagree, I'd say it's LESS than 1/2, maybe 1/3rd. Sorry for arguing with you Dave [img]/ubbthreads/images/graemlins/frown.gif[/img]
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  #5  
Old 04-02-2006, 08:14 PM
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Re: Comments on HOT 7mm\'s

BB, i wish i had a wife that argued with me like you do. i wasn't specific enough in my cartridge desciption.i was talking about the 338/300rum or edge or whatever it's called giving those velocities.and to be honest, i was gonna say a 33 would last more than twice as long as a seven and stayed conservative with double.

i'll bet that 375 hits em like the hammer of thor!
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  #6  
Old 04-02-2006, 08:20 PM
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Re: Comments on HOT 7mm\'s

[ QUOTE ]
The rig would be for deer and elk out to 600-800yds but with as little wind doping as possible thats why I was thinking about the long 7mm bullets

What do you guys think?


[/ QUOTE ]

A regular 7 mm Rem mag, 7mmWby mag, or 7 STW or 7 RUM will easily do what you want.

The bearing surface on the 200 gr Wildcat (unbonded bullet) was the same as the Nosler 160 AB give or take a small amount. This is somewhat longer than the bearing surface on a 175 gr SMK which has a BC of 0.6. SS7MM was launching the 200 grain wildcats from a standard 7Wby mag but did not have a fast enough twist to acheive complete stabilization. With a 7 twist 3 groove barrel you could have the option of the heavy bullets or the lighter ones.

A Weatherby 378 has almost the exact same case capacity as a 338 LM. If you blow them out and neck them down to 284 you have a 7mm AM with and without a belt for all practical purposes. Whether Pac Nor or Kirby will be more precise with the reamer is your decision. A 7mm AM with a 200 gr Wildcat compares favorably with a 30-378Wby with a 240 gr SMK and depends on what you want to assume is the BC of the 200 gr Wildcat.

For what you want to do you might actually think about a 264 Win mag as something fun to work with and shoot. I want one so bad I just can't hardly resist it any longer.
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  #7  
Old 04-02-2006, 08:55 PM
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Re: Comments on HOT 7mm\'s

I have all ways wanted a 7mm STW. I finaly have one but have not shot it yet. Have the dies but have not loaded any thing yet. My first experience with an STW was my buddy shoting a deer at over 475 yrds on our eastern shore. His was done by a guy in Pa name Clarance Hammond.Mine has a 1-9.5 twist I am going to try 150 gr bullets.
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