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9/22/2017 12:11:25 AM
Posted: 10/6/2005 9:02:13 AM EDT
So I have a 7.5" barrel with a 1:9 twist.

I asked about 77grain ammo & they said that it would be too heavy to stabalize and that a 1:9 would make a 77grn keyhole.

He then said that I should only shoot 55grn & that I would be lucky to get above 2000fps from a the 7.5" barrel.

???

This is the 1st I've ever heard about a 77grn not able to stabalize from a 1:9.

Is this total BS?

Thanks!
Link Posted: 10/6/2005 10:46:21 AM EDT

Originally Posted By skebe:
So I have a 7.5" barrel with a 1:9 twist.

I asked about 77grain ammo & they said that it would be too heavy to stabalize and that a 1:9 would make a 77grn keyhole.

He then said that I should only shoot 55grn & that I would be lucky to get above 2000fps from a the 7.5" barrel.

???

This is the 1st I've ever heard about a 77grn not able to stabalize from a 1:9.

Is this total BS?


1/7 TWIST IS BETTER

Thanks!

Link Posted: 10/6/2005 12:56:55 PM EDT
[Last Edit: 10/6/2005 12:57:30 PM EDT by skebe]
Ok 1:7 is a faster spin rate than 1:9.

But does that really mean that from a 7.5" barrel I can only use 55grn to get a stabalized round?
Link Posted: 10/6/2005 1:31:35 PM EDT
ar15.com/forums/topic.html?b=3&f=118&t=239790

There is some tests out of a 1/9 barrel
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