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Canadian company x-reload.com.
Not sure what's involved getting them to you unfortunately.

LAPUA 6.5(.264)139gr HPBT BULLET SCENAR 100/bx - X-Reload Inc.

There's 2 other 260 shooters I shoot with who use 139 gr scenars and they are very happy with them.
I've seen some impressive groups at 100 and at the 920y.
One is a tikka t3 sporter at 2775fps and...

Hornady 123 amax have been treating me very well for 5 years.
5 into a dime at 100.

40.5gr varget loaded to 2.820".

They take a push at 920y in the wind so if u can load heavier bullets give...