Joined

·
12,566 Posts

The 30-06 loads were shot through the Chrony out of my Ruger M-77. BTW, the Ruger is my most accurate gun. It shoots 1 ragged hole groups at 50 yards and sub-1 inch groups at 100 with just about any load I feed it.

**165 gr. 57.5 gr IMR-4350**

Average Velocity - 2711 fps

S.D - 35

The velocity was good, but I don't like a standard deviation over 25, so this is a little high. This is a REALLY old batch of powder so that nay be the reason

**165 gr 57.5 gr H-4350**

Average Velocity - 2725

SD - 11

Velocity is almost identical but I didn't have the extreme high and low of the IMR. This is a really good standard deviation.

The IMR actually had one round at the highest velocity, 2759 vs 2740 for H4350, but the H powder is much more consistent.

**180 gr PSPCL bullets over 56.5 gr of IMR-4350.**

Average Velocity - 2645

SD- 18

Interesting that this SD is lower for the 180 gr load than for the 165 gr.

Then I shot the handload I had picked as the most accurate out of my 338 MX. This is 45.7 gr of AA-2520 with a CCI-200 primer.

**200 gr FTX 45.7 gr AA2520**

Average Velocity - 2380

SD - 16.5

Again it shot great. I shot 6 shots and they were just one ragged hole at 50 yards. Highest velocity was 2405 and lowest was 2365.

I'm not sure what to do now. I have taken the load up to 46.5, which was the max load I got from Johan, but it didn't shoot as tightly. I'm thinking of loading up a few rounds at 46.0, 46.3, and 46.5 and retesting. I'd like to get an average at 2450 if I could.

Any thoughts?

For now I think I'll stick with H-4350 for my 165 gr 30-06 load, and use up the remainder of that pound of IMR-4350 on the 180 gr bullets.

I like the way my 338 shoots with the load I have, but I'm going to have to play around and see if I can increase the velocity a bit without sacrificing accuracy. When the winds die down I need to shoot it at 100 and 150 yards. One thing I did not do was chronograph the factory LE 338 rounds. I need to do that and see how much velocity I am giving up.