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Possibly, once you have a load with promise at 100, then try 300. Some loads that group OK at 100 group even better at 300 plus. (ie 1" at 100 but 2" at 300) I can't ( and I don't think anyone else...

Got some promise then, no drizzle and not much wind at my place.

How are the LRAB grouping?

Your LRAB results are like what I had in my 7RUM. Don't expect them to tighten up, they shoot well in some rifles and not in others.

The brass is 260 brass the chamber is 260AI. The first firing will blow the shoulder out to fit the chamber.

The other way to do it is to open the neck up to 7mm and then form most of the neck...

Be interesting to see how the LRAB go.