1:10+ Twist 7mm Rem Mag

Anyone herd of this?

I have a Interarms MarkX in 7mm Remington Magnum. I have been "sprucing it up for the last few months. I first replaced the stock. Then bedded the front lug. It came Pillar bedded. Then I picked up some LWT one piece Talley bases and a Sig 30mm 4-16 scope.
The gun has shot OK but same OK with anything I have tried. 1.25-2" groups. I found H4350 and Speer 160's will shoot 3/4" @ 100y. But "slow" @ 2860 max loads.
Ultimately, I want to shoot Federal Terminal Acsent 155g bullets. Well I tried some last week and discovered it would not stabilize them!! They are longer then 175g Sierra or Hornady BT bullets. Oblong holes!!!

Checked it with a tight dry patch and came up with just over 1:10. Not believing that and expecting 1:9 range... I got bore scope and carefully measured and counted rifling. Yup, confirmed, 1 turn in 10.25".

I read that Weatherbys 7mags was twisted 1:10 but most 7mm's I have seen are 1:9 range.

I can absolutely live with Speer 160's but invested in these Terminal Acsent bullets cause... Well cause they are awesome hunting bullets.

Anyone see this before??

CW

Back in my 7mag days, IMR 4350 was my favorite powder, IMR 4831 was OK too, but I kept coming back to 4350.
It was also the most accurate in my Rem700 right up at the max. of published data.
I can't remember exactly, but I was a big Sierra fan, and loaded (I think)150gr Game Kings in it.

Usually, bullets on the heavier side want a faster twist to stabilize,
but 160s really shouldn't be a problem with a slightly slower twist.

Quote:

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Originally Posted by cwlongshot

Anyone herd of this?

I have a Interarms MarkX in 7mm Remington Magnum. I have been "sprucing it up for the last few months. I first replaced the stock. Then bedded the front lug. It came Pillar bedded. Then I picked up some LWT one piece Talley bases and a Sig 30mm 4-16 scope.
The gun has shot OK but same OK with anything I have tried. 1.25-2" groups. I found H4350 and Speer 160's will shoot 3/4" @ 100y. But "slow" @ 2860 max loads.
Ultimately, I want to shoot Federal Terminal Acsent 155g bullets. Well I tried some last week and discovered it would not stabilize them!! They are longer then 175g Sierra or Hornady BT bullets. Oblong holes!!!

Checked it with a tight dry patch and came up with just over 1:10. Not believing that and expecting 1:9 range... I got bore scope and carefully measured and counted rifling. Yup, confirmed, 1 turn in 10.25".

I read that Weatherbys 7mags was twisted 1:10 but most 7mm's I have seen are 1:9 range.

I can absolutely live with Speer 160's but invested in these Terminal Acsent bullets cause... Well cause they are awesome hunting bullets.

Anyone see this before??

CW

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I don't think that 1:10" is uncommon at all. My uncle's 700 from 1968 is listed as a 1:9", but it sure ain't! Handles the heavier bullets just fine. He finished off my brother's first elk at 950 yards without a hitch.

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