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Posted: 10/29/2004 1:32:50 AM EDT
some heavy rounds i'm seering require a 'throated match barrel' does the following upper/barrel combo have this?

http://www.bushmaster.com/shopping/uppers/post-ban/purvmb24ah.asp

also, does it have a 1:7 twist to assist the heavier rounds?
Link Posted: 10/29/2004 1:46:57 AM EDT
1/9.


Also, if a twist isn't given on a Bushmaster description, its always 1/9.
Link Posted: 10/29/2004 1:56:19 AM EDT
Link Posted: 10/29/2004 1:59:49 AM EDT
XM223M1............80 gr.

with that barrel and that twist rate, what kind of groupings would be expected at 600yds w/ that round?
Link Posted: 10/29/2004 2:03:43 AM EDT

Originally Posted By eWRXshun:
XM223M1............80 gr.

with that barrel and that twist rate, what kind of groupings would be expected at 600yds w/ that round?



That you'll have to ask in the Competitive shooting forum. You sure you want a chrome lined bore?
Link Posted: 10/29/2004 2:30:59 AM EDT
not particularly.........what assembled upper/barrel combos have a 1/7 twist w/ a 24" heavy barrel w/ no chrome lining for that price?
Link Posted: 10/29/2004 2:24:25 PM EDT
bump
Link Posted: 10/29/2004 4:42:08 PM EDT
[Last Edit: 10/29/2004 4:43:13 PM EDT by mr_smashy]
I would recommend the varmint rifle upper from White Oak Armament (www.whiteoakarmament.com/)

it's price similarly, but comes with a 1 in 7 twist that will stabilize an 80gr bullet well. Call Jeff Miller and ask him how it's throated, but I have a service rifle upper from WOA that shoots 80gr sierra's that are loaded long with ease. The 10 ring at 600 yards is 12 inches wide.
Link Posted: 10/29/2004 4:46:23 PM EDT
Oh yeah, that's with a sling and iron sights, so a bench/bipod and glass would probably shrink that down.

Did I mention that White Oak is great?
Link Posted: 10/29/2004 4:51:25 PM EDT
how long is that varmint complete upper's barrel?
Link Posted: 10/29/2004 6:21:59 PM EDT

Originally Posted By eWRXshun:
how long is that varmint complete upper's barrel?



They'll assemble it with whatever you specify, 20"-26".
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