I have resisted the Grendel for some time...
I went with the 300BO some years back and it has been good to me doing 90% of what I am needing in a NEW ENGLAND deer rifle. Our deer are big, but close. I took one at about 160 and at the raking angle to bullet "bounced" off the leg bone and took out the juggler. I knew then that the 300 was gonna be limited to 100 ish yards.
I bought a 25/45 Bbl and took a couple deer with it. its a good caliber but finding a bullet that will properly preform at its velocity range is my issue... Factory ammo is TOO HOT and expands case heads excessively in three different bbls.
Late last fall I bought a HOWA 6.5 Grendel... Then this spring I bought a barrel in Grendel and "shelved" on of my 300 BO barrels. Couple months ago, Midway ran a clearance on the 110 FTX 257 bullet that they made for the 25/35 Winchester... well I have high hopes, but this bullet looks like it might be THE BULLET for the 25/45. I have hit 2650 fps and HONEST 1/4 MOA from my 20'' HB using 2200 powder. NO excessive case head expansion and NOTHING on my 450 Primers or case heads W/ejector marks.
The Grendel is also VERY accurate, but its ballistics don't impress me not even making 2500fps from a 22" or 20" HB AR bbl... I'll keep working with it using both 100 & 120 Nosler BT bullets.
The 277 dia never did impress me... But I have a few others 25's and a bunch of 30's & even a couple 6.5's. So I have these bullets diameters on the shelf already. If I choose a 277, I would need everything, and frankly, it wont do anything that what I already have couldn't or dosen't. BUT this in no way takes anything from caliber if someone liked the 270.
CW