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View Full Version : Range Report: RRA National Match NM A4, Bushnell 3200 10x scope, Burris PEPR mount



danpass
03-06-10, 20:01
RRA A4 upper, stainless, 1/8 twist, Wylde chamber, 20in

RRA 2-stage lower (RRA trigger)

Bushnell 3200 fixed 10x with Mil-dots.

Burris PEPR 1in cantilever mount

Harris S-BRM Bipod Leg Notch Sling Swivel Stud Mount 6" to 9"

Date: 3-6-10 at Trailglades Range, Miami, FL

100 yards



http://www.danpassaro.com/img/v1/p324093036.jpg

http://www.danpassaro.com/img/v12/p449856756.jpg






Fired off various rounds but here is all Hornady 55 red box.

NRA SR-1 target
X ring . . . . . . . . . . 1.35 in
10 ring . . . . . . . . . 3.35 in
9 ring . . . . . . . . . . 6.35 in


http://www.danpassaro.com/img/v10/p242368610.jpg

http://www.danpassaro.com/img/v1/p797731279-3.jpg




View thru the scope (again the black diameter is 6.35 in)

http://www.danpassaro.com/img/v2/p474458463.jpg

Dist. Expert 26
03-06-10, 21:07
Try some heavier ammo. If I'm not mistaken that rifle comes with a 3/4 MOA guarantee.

newguy
03-06-10, 22:02
so its grouping about 2.75

May not be the load your gun likes

danpass
03-06-10, 22:05
In my NM A2 upper I've had great luck with 52SMK screamer rounds (27 grn RL-15) and 77SMK rounds but didn't shoot groups with those today.

The factory Hornady 55 is showing a typical group, same thing I've seen in my A2 upper

jsharp
03-07-10, 10:47
I agree with trying some different ammo. Something heavier probably, or some handloads with Hornady V-Max/A-Max bullets.

If you're shooting for groups I'd ditch the bipod temporarily and use a proper rest and rear bag.

I'm curious if you like the scope where it's mounted? I have the same scope on a Colt HBAR and have it mounted about an inch farther back. Seems like I need to move my head too far forward otherwise.

pat701
03-07-10, 12:03
4407

I hope i downloaded this target right. This is mine at 300 yards and iron sights off a sand bag. 5" red dot target. Same rifle as yours. I bought the day after Obama was elected.
55 gran South Korean NATO ammo. My son took the picture, i know it isn't focused well. I don't reload. 60 rounds fired last month, 36 degress out no wind.

sinister
03-07-10, 14:06
So, 300-15X?

Go out and kill bad guys like a champion.

wahoo95
05-13-10, 11:48
Not sure if you reload or not, but try some 75gr Hornady BTHP's and 77gr SMK's over 24gr Varget and see what a drastic improvement you see. I have to tell you to work up to that load, however most will tell you its spot on for their 1/7 or 1/8 barreled rifles.

kittyhawk
05-13-10, 18:10
Mine Loved the Parvi 75 gr match stuff. It would shoot under 1" at 100 all day. I had a Simmons 6.5x20 scope mounted on top of the
A2 carry handle. I used it to shoot coyotes out to 400 yards and steel out to 500 yards.
I kind of miss selling it just for the fact it was SOOO dam accurate.

zxd9
05-13-10, 19:07
I ran some statistics on my RRA 16" 1:8 barrel with different loads.

40gr VMax was the worst
55gr Hornady FMJ got better
60gr VMax still a little better
69gr MatchKing - BEST
77gr MatchKing - Just a little worse than 69gr but much better than 60gr VMax


At least in my case, as the weight increased the groups shrunk and 69gr is the sweet spot for me.

VaniB
10-11-10, 11:59
I fire my factory RRA NM flat top with a 24X scope. I have tried more then a couple of dozen different load combinations since I bought it 4 years ago, and it seems to prefer heavier buillets.

I had fired a sigle 5 shot 1/2" group two weeks ago and thought I was getting somewhere. It was the first time I could get all 5 shots to stay in a small group without one or two rounds expanding the group to 1". But, I could not do it again this last Sunday. My typical best groups with this rifle is using Hornady 68 BTHP's for 7/8" to 1" groups. Sometime's I do 5 shot 3/4" groups.

It's not good enough for me, and I'll be getting a new barrel.

wahoo95
10-11-10, 12:22
I fire my factory RRA NM flat top with a 24X scope. I have tried more then a couple of dozen different load combinations since I bought it 4 years ago, and it seems to prefer heavier buillets.

I had fired a sigle 5 shot 1/2" group two weeks ago and thought I was getting somewhere. It was the first time I could get all 5 shots to stay in a small group without one or two rounds expanding the group to 1". But, I could not do it again this last Sunday. My typical best groups with this rifle is using Hornady 68 BTHP's for 7/8" to 1" groups. Sometime's I do 5 shot 3/4" groups.

It's not good enough for me, and I'll be getting a new barrel.

Try shooting with a lower power scope and see if those groups get more consistant and smaller. Too much power makes a steady hold toughe as it magnifies any movememnts and could have mirage issues. I use 10x and its more than enough to shoot tight groups at 100yds. Keep your point of aim and hold consistant and use a spotting scope to see your target up close.

danpass
10-11-10, 13:44
small update to this upper setup. I've since sold it to stay focused on highpower competition, which is iron sight shooting.

But here are 3 rnds at 400 (unfortunately the only time we fired at 400yds). That black dot was my attempt to create a 1in sighting point with a Sharpie.


http://www.danpassaro.com/img/s8/v9/p523321571.jpg







On a sidenote:

We also had poppers on the line. Very difficult at distance to knock down with .223 but a simple matter for .308





.

agr1279
10-11-10, 15:44
Ok. So you know how it shoots with a scope and a bi-pod. Take them out with irons and a sling and see how well you do. That rifle should be able to keep a moa at 100 yards. The question is can you? Try a SMK 69 to 77 or Priv or Hornandy's load. Trail Glades has a pretty decent High Power Group that shoots there. They will help you if you ask.

Dan

danpass
10-11-10, 15:52
So you're familiar with what I've already done with my A2 upper? (considering the upper referenced here has been sold)








oh, wait ........ that wasn't what you asked :p

VaniB
10-11-10, 16:07
Try shooting with a lower power scope and see if those groups get more consistant and smaller. Too much power makes a steady hold toughe as it magnifies any movememnts and could have mirage issues. I use 10x and its more than enough to shoot tight groups at 100yds. Keep your point of aim and hold consistant and use a spotting scope to see your target up close.


This is perhaps good advice for most folks who are general shooters and who are new to serious target shooting. Folks not yet accustomed with the proper equipment and teqnique that they should be using, certainly will have the reticle of a high power scope bobbing and weaving all over the place.

I have no problems shooting 1/4" - 3/8" 5 shot 100 yard groups with my custom barreled varmint rifles at 32X power. To date, at the public range I've only seen one individual shoot consistantly tighter groups with his AR15 then the 3/4" -1" groups I typically shoot. But, thanks for the advice.... it's enlightening to know that evidently you can do better using just 10X magnification. I certainly couldn't do it.

The_Hammer_Man
10-14-10, 14:27
The other possible culprit for your excessive group size could possibly be "pod bounce".

WTF is that?

It's an "artifact" that occurs when a non free floated rifle is fired from a bipod.

Even as rigid as a SS barrel is ,,, it still flexes during the firing and recoil sequence. This "double bounce" occurs much too fast to control.. you just see the effect.

I've built and used to DCM rifles and used Compass Lake's DCM FF tube that hides under the forearm caps.

I've also used this product on patrol rifles for a couple local LEO's I know. (Their dept didn't want their rifles to look too "menacing"! gah!)

also it costs about the same as a decent bipod.

Only $125.00

mizer67
10-14-10, 18:37
I think the RRA NM A4 Upper the OP said he has already has the DCM FF tube.