Yes, this.
Early American benchrest was done by breech-seating the bullets. I have a couple vintage rifles like this; a 38-55 and a .40 Krag, which is a 30-40 case with the neck blown out to .40 cal. They use custom bullet molds to get the best shape and fit. My .40 Krag has a 2"x30" barrel on a Winch 1885 receiver. I shoot 325-375gr cast bullets with 18gr of IMR4759. 4198 and 5744 also work and are more obtainable. I haven't shot the 38-55 yet, but it's made for offhand shooting, but it's American, so not all the German fancy buttstock and metalwork.
It's kind of a mix between cartridge shooting and muzzleloader shooting. You seat the (always lead, AFAIK) bullet into the lands with a breech seating tool. Then you take the cartridge case and put your powder in. I use a little thin foam disc on top of that to hold the powder in place.
Then you load the case into the chamber. The case does not touch the bullet. After firing, you take the case out, put a new primer in it, and recharge with powder. The case does not need any resizing. You can shoot all day using one case, if you want.
The above Schutzen video shows the same principles, although the American benchrest was seated from a bench, not offhand like Schutzen.
Otherwise, pretty much the same thing for the same reason; great accuracy.
This also answers the question of why our SMLs are all so amazingly accurate. It's because they aren't far off this Schutzen/breech seating principle - the bullet is in the lands and there is no case interference.
And any time I am shooting a strange or new-to-me or experimental or unknown or otherwise-iffy gun for the first time, I always hold it down with sand bags and shot bags, and fire it with a string from 25' back. I've never had anything blow up, but we do have to be very careful