ARGGG

[Buckoman]

So I did a load workup on my DPMS SASS. On a round robin I got a 1/2 MOA group. So I choose that load, built about 50 rounds n head to the range to dope out to 600. Just to confirm my 100 yd moa, I settled in and shot a group. Friggin went to pot. Now I"m about 1-1.5 MOA.

So here are the differences that could be a reason. Pick one:

I put on my AAC muzzle break/suppressor adaptor. (does torque settings matter?)

I seated my bullets a bit shorter to make em fit in the mag. They previously were AI mag length

The temperature was about 20 degrees cooler.

Any thoughts?

Oh ya, I was using the 178 Amax n 42.8gr of RL15

 

[Mattrmvpd]

Re: ARGGG

OAL of the round could be your issue... by decreasing the size of the overall round our upping the presure as well... could have thrown your round off...

Matt.

 

[Jumper]

Re: ARGGG

Installing the AAC muzzle brake would have added weight to the end of your barrel and changed your barrel harmonics.

 

[Buckoman]

Re: ARGGG

so should I rework the load using the shorter OAL? Think that'll fix it?

 

[saryan]

Re: ARGGG

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mm128</div><div class="ubbcode-body">OAL of the round could be your issue... by decreasing the size of the overall round our upping the presure as well... could have thrown your round off...

Matt. </div></div>

My guess as well.
Most the time the barrel is looking for an exact FPS. Changing the OAL can effect that which caused your accuracy to go away. I think the muzzle brake would cause a POI shift for sure but shouldn't effect accuracy. Good luck and report back to help the next guy who has this problem.

 

[AlabamaShooter]

Re: ARGGG

Damn I thought this was a pirate thread

My guess on your problem would be with the OAL length of the cartridge

 

[Buckoman]

Re: ARGGG

Ahoi maties, I'll try a new load workup and report back.

cheers,