Range Report very disappointing 300BO results

[graewolf]

So I've been itching to get out and test a some supersonic loads for my newly re-barreled AR. Finally had some decent weather and went out back today. I had put a new fore end on and removed/reinstalled my Burris XTR afterward. So, I re-zero'd my subsonic loads again at 50m - then tested my hold-over at 100m. Not fantastic, but definitely minute-of-hog. My first group once zero'd in pic #1 and then pic #2 is 1 click down 1 click left and then my wife sent some. Pic #3 is my group at 100m with Strelok+ prescribed hold-over and pic #4 is wife group @ 100m.

I had loaded up 7 supersonic rounds. 110gr Hornady Varmint (flat base soft point) on 19.9gr of H110 with COAL 2.040. Sent 2 with magnetospeed chrono on - right around 2400fps +/-. First one to see where my hold under was on the reticle, the second was to verify (vertical). Sent the next 5 without chrono, and....well, you see the results (pic #5).

This is thru an AR Stoner heavy contour SS barre 1:8 twistl. I can live with the sub-sonic accuracy, I think, but the super sonic loads held a 5 inch group size with POI at least 6 inches to the right of my subsonic load zero. Not sure where to go from here. I'll try a different load-up for sure with a different projo and powder at least. I just didnt expect it to be THAT bad.

Any suggestions?

 

[fdkay]

According to savage, this is why they don't make a .300 BO.
You can get one or the other to shoot accurately, but not both

 

[graewolf]

Hmmm, I've done alot of reading on the 300BO before I re-barreled mine and this is first I've really heard that any one given rifle will shoot subs accurately but wont shoot supersonics accurately (or vice versa). Although, if that is indeed true....then I am glad mine shoots the subs better as it will mostly be for subs.....waiting on form 4s as we speak. I'm still astonished at the 5 inch group, 6 inches right of POA at 100m. Didnt imagine it would've been that bad.

 

[graewolf]

TTT

would like some input/suggestions from the 300 BO crowd

 

[graewolf]

Any insight at all?

 

[VJJPunisher]

my trained eye says your groups are big

 

[graewolf]

LoL

Sent from my DROID RAZR

 

[Kiwi Greg]

I ran the 110 Vmax with 20.5 Littlegun at 2.105-2.110" stunning accuracy in my DPMS 1-7 twist... as usual this was fine in my firearm with my brass.... YMMV

 

[randyrucker]

Are you using a light crimp ?

 

[graewolf]

I'd have to go back and check. Loaded those 7 I shot the other day probably a month and a half ago. should I be using a light crimp on the supersonic loads? Been reloading for a bit over a year, still a newb so any enlightenment is appreciated.

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