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Dissapointing 7mm Rem Mag Velocity
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I'm getting 2,950+ fps with a 150 grain Nosler Part. in a 22" barrelled .270 Win. Ray Atkinson mentioned that O'Connor thought the 7 MM Mag awas no better than the .270. I'd rather pack around a ligh weight .270 with a handy 22' barrel than an extra 1 to 2 pounds and a longer barrell. The more things change well, the more they stay the same.

Rich Elliott
 
Posts: 2013 | Location: Crossville, IL 62827 USA | Registered: 07 February 2001Reply With Quote
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Anyone that believes a 175 gr. Nosler or whatever at 3100 is better than the same bullet at say 2800 is sadly mistaken, given the same set of circumstances the results will be so close that NO ONE can tell any difference and trajectory is only measured in a couple of inches and you can wiggle more than that....and, believe it or not in many cases 2800 will give the better bullet performance, but never the reverse...That has been my experience and thats all I have to base it on...
 
Posts: 42230 | Location: Twin Falls, Idaho | Registered: 04 June 2000Reply With Quote
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Thought you guys might find this interesting. I have Rifle Magazines clear back to the 60s. I noticed this thread a week or so ago, but a couple of days later was looking through one of the Rifle mags from mid 60s and there was an article on the "new" (then relatively so) 7mm Remington mag.

The point was that they tested a bunch of factroy 7mag loads over an Oler (? Sorry I don't know how to spell it, but you all know those high dollar chronos of that time). Federal, Win, Rem, and Norma 150s were run over the screens tthrough a 24" 700.

I don't remember all the details w/o the article in front of me, but they when from a low of about 2890 (don't remember the brand) - through the Remington brand -2990 - (I believe they were advertising over 3100).

But the Norma? (Are you ready for this) average for 15 shots? 3210 w/ 150 FACTORY! I'd bet now factory does that now, but handloaders can.
 
Posts: 341 | Location: Janesville,CA, USA | Registered: 11 January 2002Reply With Quote
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Major Caliber,
We are of accord on that, I was just making a point that bullets normally perform better at about 2800 than at extreme high velocity in many cases and of course that depends on the bullet and its construction...

Keep in mind that at 500 yds. I would definately use my 300 H&H with a warm handload, and I would use a 200 gr. Nosler at about 2900 FPS..In effect my slower 200 gr bullet would surpass the faster lighter bullet of say 150 or 180 grs. at somewhere around 500 yards or beyond, but it would have a lot more thump when it got there and perhaps as much anywhere along the way...Anyway that's the point I was trying to make.
 
Posts: 42230 | Location: Twin Falls, Idaho | Registered: 04 June 2000Reply With Quote
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Update

Today I shot some loads using the Speer 160gr BTSP #1634 and the results are much better :-

65gr RL22 - 2899fps
66gr RL22 - 2968fps
67gr RL22 - 3058fps

Accuracy was bang on for all 3 loads and SD was a max of 21fps, but typically less than 10fps. However, using the same OAL as the Sierra load of 3.28" the bullets were contacting the lands slightly making chambering a little tough. This I am sure has increased pressure and therefore contributed to the velocity figures. I'll reduce them to 3.24" next time and see what happens.

At least I now have a proper 7mm Rem Mag. It appears my rifle just didn't like the Sierra bullets.
 
Posts: 90 | Location: Cheshire, UK | Registered: 25 March 2004Reply With Quote
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