1:10+ Twist 7mm Rem Mag

[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

[Winger Ed.]

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.

[cwtebay]

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

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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