Pretty much most rounds fall short of the ballistics for the mile (even many of the .338 loads).
That does not mean that it cant be done , and you can certainly do it with the kit you have.
Get your self to Orion, good sized steels at a mile, good spotters and good sign near the target Good luck!!!
Wind reading looks OK to me, I would guess not enough on the first, over corrected for the second then kept them in the centre after that....
If first two had been sighters you would have cleaned it.
Load might need some work though, or else maybe this is a sign of the barrel going but you have dropped some V's to elevation.
Ewen
https://www.amazon.co.uk/Self-inflatable-Cushion-Thermal-Olive-green-42x31x3cm/dp/B00ENL7RNA/ref=sr_1_3_sspa?crid=250D2GU2VHEAM&keywords=inflatable+cushions+to+sit+on&qid=1566379708&s=gateway&sprefix=inflatable+cu%2Caps%2C162&sr=8-3-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzQ0xRWlJVVllYSEc0JmVuY3J5cHRlZElkPUEwNjEzMjA3M1NHUzhIUEk3NkhRRiZlbmNyeXB0ZWRBZElkPUEwMDA4MzQ0Mk1HRFYwMjc5V1hONSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
Great piece of kit, light, keeps you dry and comfortable, can be used as a rear bag or front rest.
highly recommended.
Ewen