Went out to get some work in with my .260 Rem in preparation for antelope season. Was planning on shooting long today but there was other folks at the range (our range is set up poorly so that if anyone is shooting past 200 no one else can use any other part of the range). So I shot a few groups and then they left so I backed up to 900 yards. Mirage was really heavy and the wind was swirling back and forth constantly which made the shooting tough. Put these rounds on steel and missed a wind switch on the 3rd and it went wide. Also came up 1 click between the first and second shot. Not my best shooting but given the conditions it was good practice! Need to get out earlier in the morning when the mirage isn't so bad and see where my groups are at. This load is with the 140 Amax, RP case, Fed 210 primer over 44.2 grains of H4350. MV is 2758 fps. Rifle is a custom built 260 with a stiller 30 A/W action, Mullerworks barrel @26" Rem Varmint contour, in a Manners T5A stock with Manners mini chassis and detachable mag system. And topped with a Leupold 6.5-20x50 Mark IV ER/T M5 with TMR reticle.