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Author Topic: 7mm Remington Mag.  (Read 650 times)

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Offline rpseven

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7mm Remington Mag.
« on: May 17, 2004, 12:55:18 PM »
I have a Bullberry custom barrel 24" long and was inquiring if anyone else had one of these in this caliber? I am looking for a good load for this gun so far I haven't found one. I have been using Sierra 120 gr. spitzers, I've used IMR 4350, IMR 4320, H4831SC seating the bullets right off the lands. I have found that I have to start at the lower end of the grain scale because this is a custom barrel and I have found that if these rounds are loaded the least bit hot (no where near max) the gun is hard to break open. Fred suggested this 120gr. bullet or a 140gr. bullet. Right after I got this barrel I had a load for it made up with the 140gr Sierras and then when I went to shoot it before deer season opened they wouldn't group.Any Ideas? Thanks Robert
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Offline longwinters

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7mm Remington Mag.
« Reply #1 on: May 17, 2004, 03:40:44 PM »
The primary bullet weight for 7mm is 150 gn.  I get my best  MOA groups using IMR4831.  But I do not think things are right if you can only shoot light loads. 1st thing I would do is never go closer than .010 off the lands a/c potential pressure problems, which is what you have.  I would also do some questioning of the barrel maker as well as Thompson.  Have you tried factory loads, do you get the same problem?  I would not settle for a situation like this . . . I am glad you wont either.

long
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Offline 5Redman8

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7mm Remington Mag.
« Reply #2 on: May 18, 2004, 03:28:11 AM »
Are you following the loads in your manual exactly...brass, primer, etc...?  I would try a 140-150gr bullet unless the barrel was throated specifically for the 120gr bullets.  You are correct about custom barrels...the groove dia. and chamber is tighter and therefore can cause greater pressure.  These tighter deminsions aid in accuracy.

I have had good luck withh Reloader 22 in my 280 AI which mimmicks the 7 mag.

Kyle
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Offline Darrell H

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7mm Remington Mag.
« Reply #3 on: May 18, 2004, 09:55:48 AM »
FWIW,

There was a fellow shooting a factory 7MM Mag last weekend at the range.  I saw one of his groups and it looked to be about 1/2".  He said that he was using a 160 grain Nosler Accubond bullet and IMR4350 powder.  (I can't remember the charge weight)

I personally would not want to shoot 120 grain bullets in a 7MM mag.

Good Luck!!   :D

X
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Offline smoky

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7mm Remington Mag.
« Reply #4 on: May 20, 2004, 04:13:20 AM »
In my bolt gun, 64.0 grains of AA3100 under a 150 nosler ballistic tip shoots ragged holes at 100 yards.  This load is under max according to the AA manual which has the max at 66 grains.

Smoky
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Offline gunbuster

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7mm Remington Mag.
« Reply #5 on: May 21, 2004, 06:32:36 AM »
Strange, Smokey's load and mine are exact.  Results are the same also.
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