So, being the cautious guy I am, I started my load at 11 grains of H110. There’s no real good load data for 300 BLK yet for the bullet weights I’m using, so since 300 Whisper is a lower pressure load one assumes it to be safe to use interchangeably.IMR 4166 seems to be a tad bulkier than Varget so it will be interesting to see how the two powders compare at the upper limits of their loading data. load of IMR 4166 produced noticeably more recoil but also netted an average of +171 fps. Retained weight is 290 grains with a nice mushroom. The bullet was fired from 15 yards and penetrated approximately 12 inches. The upset bullet was recovered from a very tough old wet piece of Douglas Fir. The bullets weight is reduced to 318 grains due to the shortening.Working up charges: For all pistol and rifle powders load and fire a few cartridges at 10 % less (starting) charge, than is shown, watching for any sign of excessive pressure (difficult extraction, flattened or blown primers, unusual recoil). All our loading data is intended solely for use in modern weapons.Suppose the long grain would give better bulk for our reduced loads but I'll skip that grain cutting any day. The new short cut is way nicer to work with. I used to use the old IMR 4198 in AR-15 loads where it was and is my SP-1's favorite powder.
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Since this cartridge has a shorter neck I reduced the powder charge by a few grains from the Mauser loads.
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I have worked with a couple of 11 X 60 Mausers one was a double rifle that is quite old.
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Her is a reduced load for the 30-30 Winchester.