6.5 twist question


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poorfolks
March 25, 2009, 01:02 AM
what twist rate would someone want for the 6.5 Grendel? there are 1/8.5 and a 1/9 and some that are not marked. should i simply build the upper with a specific twist or order from Alexander arms? does someone else make an upper in the caliber?:confused: thanks in advance.

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atblis
March 25, 2009, 01:10 AM
I went to yahoo and searched for
6.5 grendel twist rate
and
ta da
http://www.alexanderarms.com/faq.htm#WHAT%20IS%20THE%20TWIST%20RATE%20ON%20THE%2019.5%20Grendel,%20THE%2024%20Grendel?

WHAT IS THE TWIST RATE ON THE 19.5 Grendel®, THE 24 Grendel®?

The twist rate for the 19 ½ “ Grendel® is 1 turn in 8 inches while the 24” Grendel® has a 1 turn in 9” barrel. The difference
in twist is due to the difference in velocity between the two barrels and the twist is set to provide optimum accuracy at ranges of
200 yards and out with bullets between 90 grains and 130 grains. The twist rate for the 6.5 caliber must be carefully matched to the
application for the best results, and one should note that we do not refer to 100 yard accuracy. This is because the ideal twist for such
a range would not work well at longer ranges with heavier bullets.

I am not convinced you'd notice a difference between 1in8.5 and 1in9 with bullets lighter than 140 gr.

EDIT: come to think of it, that doesn't really answer your question. After reading a little, AA is rather quirky about the twist rate. Kinda sounds like BS to me, but who knows. My guess would be they got a better deal on one particular barrel when building a particular configuration.

poorfolks
March 25, 2009, 03:47 PM
if the question was an easy one i'd hope i could find the myself.:D

atblis
March 25, 2009, 05:21 PM
If you're interested in a particular bullet, call up the manufacturer and ask them. Sierra is really helpful from what I here (as are others)

Or you could just go with a 1 in 8" barrel and not have to worry about it. In fact, Lapua recommends a 1 in 8" for the 123 gr Scenar.

I really think AA is BSing on some of that twist rate stuff.

Get a 1 in 8" and be done with it.

EDIT: Okay, after reading that again they do mention bullet weights. That's what the twist rate optimized for.

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