100yd vs 200+ yd ammo

[MarkB]

Hi Guys,

Wanted to get your thoughts:  using Hornady Superformance SST, Custom SST, and Superformance GMX  150gr ammo, I can get about .5" MOA at 100 yds, but when shoot at 200/200+ I am all over the place.

Shooting AR308 with 24" Ranier SS UltraMatch 1:10, 6 groove.

My thought is that I probably need to be shooting 168gr+ and will try that next, but wanted to get your thoughts?

Thanks,

Mark

[washguy]

we are getting sub moa out to 300 using fed gold medal 168 gr

in our rainier 18" 16" select barrels....go to the 168... heck we are getting that with the privi 168 match :)  Wash

[MarkB]

THANKS, washguy

[planeflyer21]

What is your definition of "all over the place" when shooting at 200yards?

Jon

[Lethal Threat]

I also use SST and GMX 150's. I found if I cooled mine off by using just a little less RL15 it settled down. I have also been shooting at 320 yards. Lucky if I could hit a squirrel. But I will smoke a hog at 320 with confidence.

[Lethal Threat]

I also forgot to mention. I have an adjustable gas tube on my Bushmaster 308 ORC. It will pull a new round in, but bot enough to hold the bolt open on last round. If that makes any difference.

[edgecrusher]

168gr and 175 gr gmm in my Larue is sub moa out to 550 yds, that's as far as i've gone.

the farther you go the heavier the bullet should be… I think….  <dontknow>

[washguy]

I also forgot to mention. I have an adjustable gas tube on my Bushmaster 308 ORC. It will pull a new round in, but bot enough to hold the bolt open on last round. If that makes any difference.

Lethal  lets get that carrier to hold back  open up that gas block  otherwise  all you got is a single shot    wash

[edgecrusher]

Lethal  lets get that csrrier to hold back  open up that gas block  otherwise  all you got is a single shot    wash

What wash said, a little more gas will cycle the rifle better and hold open on the last round

[Lethal Threat]

It cycles rounds, I just have it turned down so far it will not hold open on last round. This thing drove me crazy when I first bought it. FTE and FTF it was junk. Ordered in the gas tube, slowed the cycling down, now it rocks.

[MarkB]

thanks all.

and my definition of "all over the place" is 5-6" groups.

[edgecrusher]

thanks all.

and my definition of "all over the place" is 5-6" groups.

wow ! something doesn't sound right, are you sure everything is tightened and aligned properly? I am concerned, something is way off, not even sure how your groups open up that much in a 100 yards…. .5" at 100 to 5-6"at 200?? Even the light weight bullets should hold grouping better than that…I have no answer but someone here will.. sit tight brother, we'll get this fixed…

Not sure, but a stab in the dark,what kind of glass are you using? Are you increasing magnification as you increase range? I only ask because I wonder if the reticle is loose in your scope? Stab in the dark!

[MarkB]

yeah, I was hoping it's just the lightweight bullets.  glass is Leupold VX-3....and yes, I was increasing magnification at the longer distance.

[edgecrusher]

try on your next range session keeping it at minimum magnification, and see what happens. if there is a problem in the scope tube, maybe we can find out somehow….

I know you are running a sweet barrel, and unless the barrel nut isn't tightened properly or the extension isn't aligned right, we can probably rule that out.

[washguy]

yeah, I was hoping it's just the lightweight bullets.  glass is Leupold VX-3....and yes, I was increasing magnification at the longer distance.

Hi Mark  sounds just like what happened to my best friends 308 with a vx3 leupold I built for him last month...it would shoot 2 at hundred one touching the other... then the next 2 would be 4 inches off...that kept me awake for a month...he was kidding me all this time ..saying I couldnt build crap <laughs>....we went to the range last saturday....same damn thing...i told him that his scope mounting skills suk <dontknow>  well the resident long range instructer/gunsmith remounted his high dollar leupold using level bubbles and a gun vise and a fat inch pound driver....guess what?

the thing shoots sub moa out to 300...and now i can sleep at nite <laughs>  Wash

so did you use a torque wrench and levels in a gun cradle/vise?

[survivalshop]

I see no mention of what trigger system is in the rifle , could make a big difference.

[MarkB]

washguy,

thanks for the info.....no, i didn't use level bubbles/torque wrench.....that is now on my list of to do, along with 168 gr Federal to try.  will get to reloading shortly.

mark

[MarkB]

survivalshop,

have a SR-GOLD trigger, so that shouldn't be an issue (I HOPE).

mark

[edgecrusher]

That's a good trigger, I'd start with the ammo, then move on to the scope and mount. Let us know how it turns out.

[MarkB]

ABSOLUTELY....will be shooting over the holiday weekend and hope to have some paper to show from it :)