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7mm- a quick question

 
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  #1  
Old 06-22-2005, 06:21 PM
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7mm- a quick question

I'm becomming very interested in the 7mm caliber. Very, very new to shooting, but considering of starting reloading my own bullets. I would use it for long range shooting, and the very rare hunting trips.. so for the question:

I'm looking for a case to neck up or down, or use as is, to fit the 7mm bullets in. But I want to get high velocities with the light bullets, and accurate with the heavy. Richard's Wildcats has a new 200gr pill with a BC above 1.0 I've heard? Might be wrong..

But I don't want to go up to a magnum, mostly because of the barrel life. I'm thinking 5000+ rounds for a barrel is good? (But if some one know if I can get there with a magnum without toasting the barrel to fast?)

I'm thinking about a 280, maaaybe an Ackley. Does anybody have some suggestions? Or maybe something I can read on the net?
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  #2  
Old 06-22-2005, 10:24 PM
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Re: 7mm- a quick question

7mm ar great for long range they give you a little variety, speed, B.C, and the right bullet weights for most hunting conditions. You aren't going to find a 7mm that will give you 5000 rounds of barrel life and shoot the 200's at a resonable speed. The 7 wsm is a good round and will drive all bullets up to 180's in a 1-9 twist. With the 200 grain wildcat bullets I am guessing you will need a 1-8 twist or faster. Also you will need at least a 7 STW, 7 ultra mag, 7 ultra mag improved to push the 200 over 3000 FPS. If you want to shoot the 200 gr wildcat you will have to set that barrel up for that bullet. IT will need the right twist and a very long throat. also the 7 stw and 7 ultra are very hard on barrels. If you want to play you have to pay. No easy answers when it comes to long range. Hope this helps
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  #3  
Old 06-23-2005, 12:23 AM
daveosok
 
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Re: 7mm- a quick question

If your wanting to shoot the 200 grain pills in smaller than magnum sized cases your going to need an extremely fast twist.
I think I remember seeing somewhere where a barrel company offered a 1:7 twist.
You must meet certain criteria when shooting high bc bullets, or any style bullet for that matter.
You need to be able to stabilize it; you need to be able to push it fast enough to stabilize it.
200 grain pills are meant for extreme long range and will require fast twists and fast velocities to reach maximum potential.
The 7mm rum, 7mm Tomahawk (I have the reamer for this) will do this but only in barrel lengths of over 30 inches.
I'm sure some will say that you can get it fast in a short barrel but youll be burning faster powder and throat life will decrease faster.
You want to stuff the case full of extremely slow burning powder and long barrels to get more barrel life.
I currently have a 7mm stw 34 in barrel it has about 600 or so rounds through it and the throat is fine, no drop in accuracy but I am only using 74.5 grains of H1000 and 3100 fps.
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Old 06-23-2005, 07:43 AM
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Re: 7mm- a quick question

Norhman,

The 200 gr ULD RBBT came about as a result of a project to get high performance handguns performance to reach out one mile. The rounds used were 7mm WSM and a wildcat 7mm-270 WSM(Norma brass).

At the same time Richard and I were also designing my 7mm Allen Mag which is also designed around this bullet and should be on the range here very soon to test.

You will need a 1-7 twist for this bullet. I had Dan Lilja get tooled up to build 1-7 twist 3 groove barrels for my 7mm Allen Mag to help increase throat life.

For this size of a bullet you really need to get into something at least the size of a WSM case and I would prefer using a 7mm Rem Mag case capacity as a minimum. Yes when loaded to the same pressures, the Rem Mag will out perform the WSM by a full 100 fps despite the magical claims of the WSM maker!!

If your looking for 5000+ round barrel life, I would highly recommend looking at the 7mm-08 because thats about the only round that would have a chance to reach this level.

As mentioned earlier, there is a price to be paid for performance and this comes in the price of shortened barrel life.

The 280 AI is a great round but I would not recommend it being loaded with the 200 gr Wildcat ULD RBBT. Like I mentioned, move up to at least a WSM or better yet a 7mm Rem Mag for a minimum with this bullet. The 7mm STW, 7mm RUM or 7.21 Firebird are also great high performance choices and then the next step up, the 7mm Allen Mag.

All of which will limit your barrel life but if properly cared for you will get 1200-1800 rounds of barrel life. That may sound like a very short life but unless your shooting P dogs every weekend or in comp with the rifle, this is quite a bit of life.

Good Shooting!!

Kirby Allen(50)
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  #5  
Old 06-23-2005, 08:39 AM
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Re: 7mm- a quick question

Well you kind of contradict yourself when you say that you want to push heavy bullets really fast and get a long barrel life out of your rifle. It just doesn't work that way YOU CAN'T DO IT. The faster you push heavy bullets the harder it is on the barrel. SO my suggestion is to back off a LITTLE bit and shoot a moderate load out of a pretty large case which will give you PLENTY of performance and still plenty of barrel life.

Why not the 7mm rem mag with the 162gr. A-MAX. Or if that doesn't want to shoot try the 168 gr. Berger VLD or the 175 SMK.

I still am confused why everyone is still trying to make the largest bullet shoot the flattest (that's the goal of the wildcat cartridge) after all with the right yardage reading and a good drop chart with a descent rifle any of the standard calibers can do just fine. AND it's easier to find dies, reloading information, a factory rifle can do just fine, no gunsmithing needed. Not to mention trying to find affordable brass or make it.
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  #6  
Old 06-23-2005, 09:14 AM
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Re: 7mm- a quick question

This is supposed to be my first rifle. But I dont want a 308 that everybody seems to get for their first rifle. It's supposed to be a all-around rifle, for target, and the very very rare hunting opportunity.

For this I will need a hunting round heavier than 140 grain and energi of 2100ft/lbs at a 100 yards. (Special rules in my country) So I'm most likely to use heavier bullets than 140 grain..

I don't want to go up into a magnum, because I know it burns the barrels faster. So I'm wondering what case I could neck up/down to get a good caliber. I want speed, but not a fast barrel burner.

Right now, I only know of using the 30-06 case, and the 284 Win.. is there any other case to use, without going up to a magnum?

BUT.. If I use a magnum, is there a good one to load it down to use for target practice, and just use some hot loads for when I'll go hunting? That way, I wont kill the barrel to fast..
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  #7  
Old 06-23-2005, 10:07 AM
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Re: 7mm- a quick question

[ QUOTE ]
and a wildcat 7mm-270 WSM(Norma brass).

[/ QUOTE ]

Kirby, tell me more about this round. My uncle and I were going to put in an order for this reamer this week for a new project. Do you have the reamer already? What is it like? Can you give me more info on velos attained?
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