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Posted: 11/12/2002 5:09:01 PM EDT
I have a new ROCK RIVER ARMS rra varmint with 20 inch barrel and the Wylde chamber. I need to know what to use for ammo? It dosnt like 55gr. Also can anyone tell me what the Wylde chamber is? I expect this to be a real tack driver when I find the right bullet weight. Anyone have any experience with this rifle? It has a wilson stainless bull barrel and a match trigger and a free float aluminum tube. It is nice. But the ultra max 55gr ammo I sighted the rifle in with wont group well. It did around 2 to 2 1/2 inches. I need to know about the chamber and what to feed this thing with that twist of 1:8
Thanks
Kelly223
Link Posted: 11/12/2002 5:17:19 PM EDT
Dont worry about the chamber. It simply understated, is a hybrid of SAAMI and NATO.

It's not the bullet weight that I have found that affects grouping at 100yds, as much as it is the quality and consistency of the components, and the cartridge as a whole.

FWIW, I have found three cartridges to be very successful in the RRA 1/8 Varmint upper:

Black Hills Blue box 68gr (50ct)
Black Hills Blue Box 52gr (50ct)
Wichester White box Varmint 45gr (40ct)

All of these group right at 1" all day long. I have had trouble getting sub MOA reliably, but have had a few .75" groups and one .5" grouping.

I would like to try some Federal gold medal match. I hear this barrel likes 69gr sierra's. Dont know yet.

Best ammo of course is going to be a handload worked up for your particular rifle.

Link Posted: 11/19/2002 9:23:35 PM EDT
You might want to check out this thread in the competition forum:
www.ar15.com/forums/topic.html?b=1&f=10&t=152439
Link Posted: 11/20/2002 3:07:03 PM EDT
Should like 62grn and heavier bullets.
Link Posted: 11/21/2002 2:15:31 PM EDT

Originally Posted By 5subslr5:
Should like 62grn and heavier bullets.



And yet, I seem to get my best groups with 45gr.
Link Posted: 12/3/2002 3:57:38 PM EDT
I have a 1:9 barrel and have found BH 52 very good to 200 yds, and Sierra 69 handloads excellant @ 300 yds. BH 75 (Hornady I think) also do well @ 300. I would try the Federal GM 69 for sure. Sierra 77 have a very good reputation but I don't know if they are available in a factory load. Check GA Precesion for BH ammo.
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