Orneryolfart357, some guys have given you some great advise here. You would not be happy with the Varget if you saw the speeds on a chronograph, it is slow with the light bullets.
I shot a lot of ground squirrels up in your neck of the woods years ago, no better way to test a bullet or load than on a ground squirrel, especially when all you can see is a head sticking out!
AA2015 will give you 1/4-3/8" groups with the 50's at 3550 fps with extreme accuraccy which was the load that I shot so many ground squirrels with. The 50's will carry the freight at 300 yards better than the 40's.
If you can find it N-133 will give you velocities in the 3900 fps with benchrest accuracy out of a 26" barrel with the 40's. Use the Rem 7 1/2, CCI BR-2, or CCI 450 primers which have very thick cups to maintain loads at the higher pressures. N-133 is a dream come true for guys that shoot a 223 with the 40-50g bullets, and the N-135 will push the 55's, 3400-3550 fps with extreme accuracy in a 1-14 twist depending on the gun and chamber.
My hunting partner shot the 50g Sierra lead tip blitz with 26.0g-27.g of H335 out of his Rem 700 V in 223, it was a death ray. He shot another load of 24.5g of AA2015 using the Speer 55g Lead tip (now sold in 1000 packs) Sp that would send ground squirrels 6 feet in the air at 300 yards.
No doubt that the 40's at 3900 will make a powder puff out of a magpie!
Keep us informed on your squirrel shooting Safaris!