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AR15.COM
3/3/2011 4:32:01 PM EDT
I have a RRA Predator with a 20" barrel. What is the best grain bullet to shoot ? Been shooting American Eagle 55 gr. works great so far. Can I shoot steel case in it or will it harm the feed ramp ? What about the laquer will it harm it?
3/4/2011 6:46:27 AM EDT
[#1]
We recommend AGAINST any steel -cased ammo.  Te few cents in saving s aren't worth both the real and potential downside for your rifle's continued function.
You have a 1:8 twist, so it should shoot heavier projectiles as well or better thna the 55s you have been using.  Try some 68/69gr and see how they do.  You can go as high as the 75 and 77 gr loads, but many of them would have t be single loaded off of  asingle shot follower as they don't fit the magazine.
Steve/RRA
3/4/2011 8:54:46 AM EDT
[#2]
Not my best grouping bit it will do.  The space between the 2 and 3 round grouping is my heart beat.  Sounds funny but it changes my point of aim/impact by 1/2" if my timing is out.
I only ever shoot brass through my PP.  I leave the steel case to my Mini 14/30's
http://www.gunstuff.co.nz/thumbnail.php?pic=uplimg/img_A_109444_06d1c4f1b6edef27ca4b773ac344b415.jpg&w=500&sq=N&b=N
3/4/2011 12:47:51 PM EDT
[#3]
Happens to all of us...but even with that deviation, that group is really good.
Steve/RRA
3/28/2011 9:11:28 AM EDT
[#4]
I tried black hills loadings until I found bullets that shot well out of mine.  The 55g AE are a bulk type ammo and while they shoot, they are not a match type ammo.

I found that the 50g Vax shot great.  The 68g hpbt grouped slightly larger than the 50g.  I hand load 60 g vmax and 60g sierra hp.  The 60Vmax was the honey for my rifle.  

Rifle was a RRA 18" varmint.  I woud figure that yours should shoot near the same since it is also a 1/8 twist.  The best two groups I got were 3/8 in at 100 yds - bipod and sandbag under the butt.  Love the RRA 2 stage trigger :-)

I have my eye on a coyote special for the slight weight savings....or maybe a 6.8 to play with or maybe/prob both.