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7mm rifle build choices, help, feedback?

 
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Old 03-02-2011, 02:41 PM
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7mm rifle build choices, help, feedback?

I am looking to build a 7mm long range rifle and have yet to decide on which 7mm or who to have build the rifle. Long range for me would not be over 1,000 yds as many around here shoot and is more like 800yds and in for my considerations. I have a 300 RUM and a 6/284 so I am not interested in .30 or 6mm right now. Rifle would be for medium sized game, deer, antelope, javalina (ok they're small) and time at the range.

The rifle must be able to shoot factory ammo so I am not looking at any wildcat rounds. I dont want to travel to a hunt find a missing box and have to borrow a gun or scrap my hunt due to lack of ammunition. I will play with fine tuning handloads but wont be building a rifle specifically for longer heavier bullets.

So which 7mm? My plan started with the 7mm WSM but I have seen a lot of 7mm Rem Mag and SAUM users around as well and a few that have said just go with a non-mag round .284/7mm. I was staying away from the big cases such as the 7RUM based on a lot of negative feedback on barrel life.
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Old 03-02-2011, 03:51 PM
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Re: 7mm rifle build choices, help, feedback?

Based on your factory ammo requirement, I think 7mm RM would be your best bet for sheer availability of factory loads. No other 7mm chambering comes even close.

If you want to go with a non-magnum chambering, .280 Remington, .280AI, or 7-08 would fit the bill. Though factory ammo for .280AI is less commonly available, you can still shoot standard .280 Remington factory loads in it (albeit with reduced velocity). Of the non-magnum 7mm chamberings, the .280AI comes the closest to 7mm RM performance and would likely provide the best performance from hand loads.
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Old 03-02-2011, 04:20 PM
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Re: 7mm rifle build choices, help, feedback?

I shoot many 7mm's. I like the 7mm STW the best for long range hunting.
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Old 03-02-2011, 04:30 PM
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Re: 7mm rifle build choices, help, feedback?

I have never let having factory rounds slow me down. I just go buy a few 100 cases. I even had 240 cases for my 30-338 Weatherby. @ about $3.00 per each unprimed case. Be realistic. What event would you go through 300 rounds or 500 rounds and have to worry about finding a store for more. I've said the same thing to friends. Don't WORRY! I have cut down cases and fire formed wildcats. Some of my guns don't even say what they are stamped on the barrel. Good luck on stealing one of them and trying to figure out what might fit in them.

I reload, chronograph, ballistic tables, keep notes. So I would not want to buy some factory load for my OEM rifles anyway. Because you would have to start all the new load data over and chrono the factory round to figure out where it's going

Anyway enough said.

I'm a 7STW person. But the 284 Jarret might be a fine rifle.

The 284 jarrett is a 300 win mag necked down and blown out with a sharper shoulder, these are the case volumes and velocities they have posted on their site.
(Volume to base of neck)

7mm Remington Magnum 73.5 gr.
7mm Weatherby Magnum 78.0 gr.
284 Jarrett 85.5 gr.
7 STW 98.3 gr.

It's interesting to note where we are volume-wise, 12 grains greater than the Remington Magnum and 13 grains less than 7 STW.

140 gr. bullet -- 3450 to 3500 fps
150 gr. bullet -- 3350 to 3375 fps
160 gr. bullet -- 3250 to 3300 fps
http://www.jarrettrifles.com/cal_284_jarrett.htm

Any other opinions on jarrett barrels???
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Old 03-02-2011, 05:21 PM
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Re: 7mm rifle build choices, help, feedback?

1+ on the 7 STW. I studied this question a few years ago and chose the 7 STW. It seems to be about the optimum "over-bore" 7mm.

That is, cases larger than the STW sharply increase inefficiency (incrementally larger powder charges required for smaller velocity gains) and decrease barrel life.

.
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Old 03-02-2011, 06:16 PM
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Re: 7mm rifle build choices, help, feedback?

7mm rem mag
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Old 03-02-2011, 06:24 PM
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Re: 7mm rifle build choices, help, feedback?

With the factory load as a condition, the 7 mag is the one. Load a 168 VLD around 3000+ and you can shoot Rem factory 150 Sciroccos with the same drop data within a click or so at medium ranges.

Without the factory limitation, the 7 mag is still a great choice and a great balance of recoil and ability to launch a heavy bullet.
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