Call Jim at North Land Shooters Supply.
I have Swedes and they are truly a superb calibre. Long ago I read that the Swede has a huge free-bore that should detract from the accuracy but doesn't seem to. The gist of that was that the author thought that the Swede's intention was to make a chamber with excessive free-bore. Other readings have revealed that the Swede was manufactured when Sweden was using a 180 or 160 grain round nose cartridge. That is a long cart and the bullet must have contact with the bore a long way down the barrel. After these barrels were manufactured and the guns made it was decided, almost universally, that more velocity and FPs of energy attributable to increase velocity was a better deal in that it shot flatter. The Swedes must have found in testing that the gun performed exceeding well in spite of the free-bore...not because of it... so they left the "formula" alone. All this is an amalgamation of different comments by more than a few "experts" and my conclusions may not be properly drawn....but.
If you consult with barrel makers such as North-land Shooters Supply, Jim will put you on the right track. Load a Dummy round with the bullet of your choice in the brass you will use and send that the Pacific Tool and Gauge. Have them make a "NO TURN" chamber reamer and have Jim (HSS) tell you where to have the reamer drop shipped to where you get your barrel reamed. We are talking 9 weeks approx.
Or you could buy a reamer off the shelf and have Jim chamber a 6.5 for you. Couple weeks, I would imagine. This would never shoot as well as the other but what do you want it for?
HTH
John
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