The recoilless rifle is actually a rocket launcher.
Do a google search. Your question answers itself.
If you mean a weapon fired from the shoulder, and exclude military anti-tank recoiless rifles, it is probably the 950 J.D. Jones, which weighs about 100 lbs. If you simply mean a rifled weapon, then the 18.1 inch naval cannon used by the Japanese Navy.
Mikhail Kalashnikov designed the AK47 rifle. If, at any point, he had designed it for a larger cartridge (which there is no indication that he did), then it would have been because he had begun the design before the requirement was made that his design utilize the 7.62x39 cartridge, which was first used in the SKS rifle.
The first successful design for a semi-automatic rifle is attributed to German-born gunsmith Ferdinand Ritter von Mannlicher, who unveiled the design in 1885
The quick answer is a .410 bore - but there are relatively low recoil 12 ga. guns as well. Browning made a "recoiless" trap gun which almost is recoiless. In general, a gas-operated semi-auto will have less recoil, and in some cases this can be combined with a recoil-absorbing stock.
Any rifle they make them for
Find a copy of Black Rifle II by Christopher Bartocci
The SMLE. Short Magazine Lee Enfield rifle. Picture above.
Th XM8 rifle was developed by the US Army from the late 1990s to the early 2000s. It is a lightweight assault rifle. The US Army collaborated with Heckler & Koch to design the XM8 rifle.
Bullet security cameras are not shaped like rifle bullets but are based upon the design of the bullets with similar aerodynamic design being used by both products.
Every rifle has its strong and weak points. Many rifles out there could be considered the greatest, based on their impact, functionality, and other features. The Kalashnikov rifle has had a major impact on the world, for the sheer numbers produced and its widespread distribution. Like any other rifle, it is imperfect, and has design flaws. The Garand rifle could be another contender, as could the FN-FAL, which has seen service with over 70 countries.
The same way you would clean any Marlin lever action rifle. These models are of the same design of a Marlin 30-30.