Range Report Report-208 a-max @ 600yds in 300 wm

[Surffshr]

Got to shoot yesterday and took 40 rounds of H1000 loads. I had previously shot only at 100yds with this rifle so I was interested in how accuracy would hold up at range. Two loads that were MOA at 100 were 74 and 76 grains. I loaded 10 rounds of 74, 75, 76, 77 each and used new brass for 5 and fireformed brass for 5.

JBM said I needed 12.5 MOA at 2800 fps (74 gr load) and 11.5 MOA at 2900 fps (76 gr load) . So what happened right?

74 grains shot MOA with both fire formed (5.5") and non FF (6")brass.

75 grains shot MOA with non FF brass (6") and with FF brass (6"). However there were 4 shots in 2.25" with the FF brass.

76 and 77 grains sucked but still held 5 shots to under 9" on all loads.

I adjusted my come ups after the first 5 shots to 11.25 MOA (I shot low to high powder load). I could have adjusted down another .25 moa with the two higher loads but I didn't.

All in all I was happy with what the rifle and my reloads did the first time at 600.

 

[Freeze]

Re: Report-208 a-max @ 600yds in 300 wm

Sounds like you had a good day. I would try messing around more on the inbetweens in your loads. Jumping up in 1 grain increments, you could miss an accuracy node all together. I go up in .2 grain increments, but I am a little neurotic. Most go up in .3 increments. I think you will find it helps you break that 1 MOA mark.

 

[Surffshr]

Re: Report-208 a-max @ 600yds in 300 wm

Thank you for the tip Freeze. I try not to feed my neurosis but I think that is a good tip. Right now measuring COAL is driving me nuts...have an order for the Hornandy kit to measure the ogive and considering getting the Redding Competition seater die.

 

[Bigwheels]

Re: Report-208 a-max @ 600yds in 300 wm

Absolutly get the comp die, & measuring kit. I also agree with Freeze. Go up in .3gr. increments. I use Moly'd 208's in my 300WM, & use 78.6gr of H-1000. Coal is 3.6" 2.910" to the Ogive. Shoots 2 1/2" to 3" groups @ 700yds if I drive it right. Also have a 3 rnd group @ 2K in 13"