The targets were all produced using the same method:
The rifle was set in a recoil absorbing bench rest.
It is a Deluxe Shooting Rest from Shooters Ridge that I modified. I added 50 pounds of weight in the form of 2 barbells. With most rifles, the rest barely moves.
Note that grouping is more important than shooting bullseye. Once the group is tight, the sights can be adjusted to move the group towards the center of the target.
Mauser Karabiner 98 Kurz
Lee Enfield No.4 MK2
M1 Garand (**)
**: Contrary to other rifles, the M1 Garand was affected a lot by a hot barrel. To obtain that result I had to wait a lot between shots. For the other rifles, each shot was fired with a 5-10 seconds interval. For the M1, I waited 60-90 seconds! Faster than that and the group would open quite a bit.
I did try waiting longuer with the other rifles - just to be fair - but the results were similar to the short interval tests.