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PO Ackley's book has data for the 6.5x55 Improved Arch which should be exactly what you are looking for. Some of the loads listed in his book for various cartridges are very hot, so you know to start lower and work up. I have two 6.5x55's and one .260AAR, which is the 257 Ackley Improved necked up to 6.5. I am still working up loads for this new rifle, but so far it is getting 3027 fps with the 120 ballistic tip and 2933 with the 129g. The 140 core locked is 2857, which should be close to the top. My 23" rifle has a very long throat, and I am not at max levels yet.
The Arch shows 3140 with the 120, 2890 with the 129 and 2908 with the 140. It has 2-3 grains less capacity than the .260AAR. My 26" bbl. Swede does 3021 with the 120g, 2966 with the 129g and 2900 with the 140g Hornady. As you can see, the difference between the standard and the improved Swede will probably be about 60 fps. in a 23" bbl.
What hasn't been mentioned is greatly reduced case trimming
and having something no one else has.
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