The answer is yes, the new bullet sits deeper. The reason for the change is to create a bullet that loads in a standard 444, through the loading gate especially. The idea is a person can just seat it to the crimp groove and shoot. Easy to accomplish up to somewhere around 400gr but the bulge in the case changes the loading angle with bullet weights above that.
Seated at 2.495", the rim of the case just gets past the back edge of the port. With a .275" nose length, you can load to that depth and have a front band that seats snugly into the throat. No turning case necks or modifying loading ports.
Once I accomplished that, I hoped to have a bullet that can be pushed to 1800 fps and I have achieved that with 38 gr of RL7. I have been told as I ventured into this project over a year ago, that velocity drops off so fast after 400gr that it defeats the purpose. I held the belief that space lost inside the case wont be so great that it make the bullet useless. Of course I have already pushed the 450 Hamfist close to 1700fps and that bullet has so many faults.
The accuracy with the Huckleberry has been plenty satisfactory.
H4198 has been really swell for me with bullets, both cast and jacketed, up to 300gr. I want to ultimately test the bullet with above mentioned powders, plus H322, H335, H4895, IMR3031, Win748 and some others just to get some data with some of the more popular powders with 444 shooters.