Extreme Spread?

[RockZ]

did you try many different powder charges

i will run some numbers on quick load

[MSU Marksman]

You may also try different primers and a shorter COL.

[RockZ]

Remember the quickest way to reduce ES is by changing powder charges. If one powder doesn't work try another.
You can really fine tune it with case prep, neck tension, sorting etc.
But the biggest most drastic change is through the powder.

[Firecat]

Thanks for your replies. I did try several different powder charges when i was doing my original load development. Unfortunately I did not own a Chronograph at the time. I chose the the charge that yielded the tightest groups. This particular load is around 2.5 grains off of max. So fairly mild. I am considering trying a different powder like Retumbo or H1000. I also thought about Reloader 22. This is a hunting rig for late in the year so the extreme hodgdon powders have caught my attention because of their reaction to temperature change is so minimal.

[RockZ]

I ran some numbers on quickload and it looks like H4831or H4831SC will work better than IMR 4831.
You get a 95-100% fill rate and good burn characteristics.
H4831SC would be my first choice to try, that way you can stick to the extreme powders.
Just work up a load that is in the 2900-3000fps range and work around that.

Retumbo and H1000 is a bit slow for the 180gr.

VVN560 is also a very good powder for the 180gr.

H4350 may also work but you will only get about a 88-90% fill rate.

[Firecat]

Rockz, What is the quickload program that you are using?

[RockZ]

Here's a link
quickload quicktarget software