In the early 1980's or there about a I spent a lot of time on a 660 Or 600 Remington. I replaced the stock with Kevlar, bottom metal with AL, barrel with high dollar 22". I worked on many loads. I worked on loads through April 2005. I thought that I'd share the loads. I didn't have a chronograph at the time.
55 gr H4895 Hornady Interlock 250 gr sp .7 MOA
55 gr Win 748 Hornady Interlock 250 gr sp .9 MOA
60 gr Win 748 Hawk 225 gr TOO HOT 7 MOA do not use
57 gr Win 748 Hawk 225 gr 5+ MOA
56 gr old lot IMR4064 225 gr Hawk 4 MOA
57 gr Win 748 250 gr Speer sp 1.9" MOA probably too high pressure
61.5 gr Win 748 225 gr Nosler PT 3.1 MOA probably too high pressure
56 gr IMR4320 250 gr Speer sp 1.5 MOA
55.5 gr IMR4064 250 gr Horn sp 1.4 MOA
57 gr Win 748 250 gr Horn sp .75" MOA top load - do not increase
53 gr IMR 4895 250 gr sp 1.8" MOA
60gr IMR4895 225 Nosler pt 2.8 MOA
56 gr H335 250 gr Speer sp 3.75 MOA
56 gr IMR4320 225 Hawk 5+ MOA
55.5 gr IMR 4064 225 gr Hawk 2.35 MOA
54 gr H335 250 gr H335 WLR primers unburned powder
60.8gr H335 91/2M primer 225gr Nosler 3MOA TOO HOT
56 gr H335 250 grain Speer 3MOA Horn 2.5MOA 91/2M primer
57 gr IMR 4895 225 gr Nosler pt 2.5 MOA
60 gr Win 748 225 gr Nosler pt 3+MOA
62 gr Win 748 225 gr Nosler or 1.25MOA DO NOT EXCEED
56 gr IMR3031 225 gr Nosler pt 2MOA
56 gr IMR4320 250 grain Speer or Hornady .4MOA BEST GROUPING!!!
I shot quite a few more groups, but my notes show too hot or inaccurate.
I've settled on H4895 55 gr and Hornady Interlock. I've had bad luck with Speer hot cores in other calibers - so have not used them on game yet. I've read high praises from others though on this bullet.
When there's a temp insensitive powder from IMR close to 4320, I'll try it.
