Armalite 300 SAUM

[blksno]

In the final stages of (new) load development for my hammer. The load I was using may have been to hot for summer shooting so to be safe, I started looking for a new one.

Took it out to 500 today and was pleased, but my chrono gave goofy data so I'm going to plug some numbers and head out for a 5 shot test tomorrow.
Maybe 800 this time.

View through the 8-32x56 NXS

3 shots at 500
About an 8mph wind was in my face switching from 12 to 2.

 

[The Punisher]

Re: Armalite 300 SAUM

SWEET!!!! Lets us know what she does @ 800.

 

[blksno]

Re: Armalite 300 SAUM

Went out today to verify my velocity at 800, and hope to keep a sub moa group.

Ended up being 815yds but my set up was less than reliable.
Shot off my bipod and monopod because the angle was too wacked out to use my rear bag correctly. -4 degree angle and rough, hard ground.
Wind was again in my face 8-10mph from 12-1 o'clock but this time I didn't make any adjustments...just held right edge of the yellow square.
Mirage got crazy pretty quick, but gotta learn to deal with it till my cover gets here.

Here is the home made "Shoot-N-See" target through the scope on 32x at 815yds.
22"x28" with a 3"x3" Post-It to aim at.

As for the drop test, I'm happy...velocity needed for 500 held true at 815 so that's good, but I'm hoping to improve my form/technique before next fall. At any rate...she'll kill a deer.
Sent the first 3 at an old target at 100 to make sure I reset my turrets yesterday...I have a problem with that.
Here were my last 7 at 815yds.
Pretty sure the one hit on yellow was my first shot because I couldn't see it and was worried.
2, 3 and 4 were on the left...5, 6 and 7 were on the right. Very easy to pick out the pink on black.

Elevation adjustment was exactly 20 minutes.
Conditions....
29.87 Hg
66% humidity
86°
Altitude: 340ft
Angle -4
8-10mph from 12-1:00

 

[Casey Simpson]

Re: Armalite 300 SAUM

Less than a minute vertical dispersion. That's acceptable for the general bolt action rifle even. Auto loader? Awesome.

86F in South Dakota today?
Pine treest in SD?

 

[blksno]

Re: Armalite 300 SAUM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Casey Simpson</div><div class="ubbcode-body">Less than a minute vertical dispersion. That's acceptable for the general bolt action rifle even. Auto loader? Awesome.

86F in South Dakota today?
Pine treest in SD? </div></div>

Weather has been crazy in SD lately...and yeah, there are lots of pines where I shoot on the western side....BUT...I've been working in south east Texas for about 2 months , hence such a low altitude.
Where I shoot in SD...its about 3100.

 

[blksno]

Re: Armalite 300 SAUM

Went back out today with great success.

Decided to split the distance and try 700 yds.

Literally no wind...used my windicator powder both at the target and the shooting location and powder fell strait down. Best conditions possible.

29.97
Elevation 345'
48% humidity
-4 shooting angle
81 degrees
zero wind

With my first range reading from ffp to target, I got 668 three different times, so I trusted it, plugged data, dialed (15.1 minutes) and sent 5 rounds, recording velocity on each shot.
1.) 2677
2.) 2695
3.) 2706
4.) 2712
5.) 2720

Took drive down for a better look and ranged back toward a box blind that was behind my shooting location about 16 steps. Range said 719-720 on five different tries...so when I got back to my shooting location, I plugged in 703 instead since I was getting a stronger reading off a reflective object.

Adjusted to 16.3 minutes and 1/2 left for spin drift and sent 3 more rounds. Couldn't see the 2nd impact so I assumed it hit in the yellow...but when I got to the target, noticed it was almost directly in the same hole as the previous. Three shots with recorded velocities.
1.) 2753
2.) 2759
3.) 2771

I think I need to figure out how to keep my velocity more consistent. Not saying it is responsible for the vertical string, but it sire looks like it.

Any thoughts or suggestions? It's still less than 5" of vertical at 700yds...but it would be nice to shrink that up.

 

[Tx_Flyboy]

Re: Armalite 300 SAUM

Cbass,

What powder/primer combo are you using? That may be the root of the problem...I read a comprehensive test of various primers and the Russian primers gave more consistent accuracy, yielded lower ES, etc...if only i can locate the article.

 

[blksno]

Re: Armalite 300 SAUM

Don't get me wrong...sub moa at that distance with my level of training and experience is pretty good...but "pretty good" is never good enough.

RL17 and Fed 215's
I've got some match 210's I can try as well.

It was just interesting to see the velocity slowly increase with each shot.
I was single loading them so they wouldn't sit in a warm/hot chamber any longer than they had to.