Thread: RL26 loads 7mm Saum

Ok ran a ladder test with the RL26 and the results were a tad confounding!
180ELDM in norma 300 Saum cases necked to 7mm 1x fired and FLRS fed 215 primers.
Using a magnetospeed crono
gn fps
60.0 2511
60.5 2462
61.0 2509
61.5 2570
62.0 2578
62.5 2634
63.0 2622

162 EDLM same cases as above
62.0 2630
62.5 2590
63.0 2674
63.5 2707
64.0 2696

These velocities are well down on what I am getting with Superformance 62.5 = 2950
2 groups with the 180's
60gn - 2495/2466/2495 SD 28 - 1.05moa
61gn - 2536/2529/2536 SD 3.8 - 0.6moa

162's
62.0 - 2636/2637/2605 - 1.0moa

No cratering/flattening of primers, extractor mark etc.

Hmm - I have not seen an increase in powder by a grain resulting in a drop in velocity before. Any suggestions as to the rookie error I might be making?

Cheers AMac

Originally Posted by AMac

Ok ran a ladder test with the RL26 and the results were a tad confounding!
180ELDM in norma 300 Saum cases necked to 7mm 1x fired and FLRS fed 215 primers.
Using a magnetospeed crono
gn fps
60.0 2511
60.5 2462
61.0 2509
61.5 2570
62.0 2578
62.5 2634
63.0 2622

162 EDLM same cases as above
62.0 2630
62.5 2590
63.0 2674
63.5 2707
64.0 2696

These velocities are well down on what I am getting with Superformance 62.5 = 2950
2 groups with the 180's
60gn - 2495/2466/2495 SD 28 - 1.05moa
61gn - 2536/2529/2536 SD 3.8 - 0.6moa

162's
62.0 - 2636/2637/2605 - 1.0moa

No cratering/flattening of primers, extractor mark etc.

Hmm - I have not seen an increase in powder by a grain resulting in a drop in velocity before. Any suggestions as to the rookie error I might be making?

Cheers AMac

It will just be a case that the ES for each load is actually quite wide, and you happen to get a high value from the range on one step and then a low value from the range on the next, the range of velocities for each step will overlap substantially. you're making a less than 1% change in powder charge per step, you'd expect about a linear less than 1% change in speed