I tested my loads today, and the results were interesting. IMR4895, despite throwing +/- 0.4gn on each charge, was the most consistent in both velocity and accuracy. H4895 did OK, but I had a couple of malfunctions with the lighter loads. Overall, I think I'll keep loading the "tried and true" load with IMR4895 and not worry about the powder measure throwing imperfect charges. If I start shooting longer distances or more competitively, I'll have to tighten up these numbers.

I only had one 6th round stoppage (in 9 clips), so I just gave that clip to a guy at the range who got excited every time he heard the *ping*. Win/win.

Here is all the data I collected today. All loads used Winchester LR primers, .310 Hi-tek GCSil 170gn bullets from Norm Purcella, and mixed brass. 16 shots each.

H4895

charge: 33.0gn (+/- 0.2gn)

Avg velocity = 1899fps

Std Deviation = 31fps

High/low velocities = 1963/1839

H4895

charge = 34.0gn (+/- 0.2gn)

Avg velocity = 1960fps

Std Deviation = 52fps (yikes)

High/low velocities = 2048/1823

** I didn't shoot the ones loaded with 35.0gn of H4895 since velocities were already higher than I expected.

IMR4895

charge = 35.8gn (+/- 0.4gn)

Avg velocity = 1963fps

Std Deviation = 31 fps

High/low velocities = 2011/1899

Thanks again for all the help.