Thread: RL26 loads 7mm Saum

Well after the last trip to the range in December and results that were disappointing to say the least, I did a bit of research and spied a Bryan Litz article that discussed the Effects of eating Depth/COAL on Pressure and Velocity. So went back and measured the last loads 3.005" and remeasured the point a 180ELDM engaged with the lands 3.145". So I produced loads for ladder testing with the 180's and 162's at a COAL of 3.137".

Made a couple of other changes - firstly given Kelton's advice re using 210's instead of 215 primers, I grabbed some of the white river LRP - nearest thing I could find to 210's.

Secondly, I sold the Magneto Speed and brought a Garmin Xero - and what a great wee bit of kit that is!

Very different results this time
RL26 180ELDM LRP Norma brass
62.5 2841
63.0 2858
63.5 2882
64.0 2907 stiff bolt slight extractor mark, decided to stop there.

let the rifle cool down then did a 3 shot group at 63.0 produced 0.608 moa. Happy days.

Small ladder with the 162 ELDM but with 215's
64.0 2952
64.5 2963
65.0 2992
65.5 3055
Only loaded 4 rounds so no groups shot. No sticky bolt lift of extractor marks.

I came away much happier this time - 2850 with the 180 is where I had been hoping to get near.

Cheers

AMac