Further on this, today I tried my first hand loads in the Mauser M18 - docked to 20". It had previously had 6 shots through it from new.
All loads today shot (3 shot groups) at or around .5 MOA.
Started wit soft H1000 loads. 57 grains. Factory OAL.
142 LR Accubonds 2800 fps (under .5")
139 Hornady 2900 fps (about .5"). This represents less than 20 fps loss per inch of barrel from the Hornady manual, which is pretty damn efficient.
Ladder with N565 (slightly longer at max mag length), 140 Berger Hunter. Didn't chrono.
57gr & 58 gr shots were touching and pressure OK.
2x 59 grns .5" to right of above, touching, and very slight pressure signs.
Looks like 58/58.5 n565 might be the go. Expect circa 2950 fps.
I have some R26 but will use the 2 pots of N565 first. Am out of H1000.
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