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A significant problem during those times regarding the rifle was that the gunpowder had the tendency to accumulate in the grooves and hunters had big problems while cleaning the barrel.
Another issue was with the speed of loading the bullets and even a trained marksman could only fire three times in a minute. You can also buy best airsoft rifle online at https://alchemyairsoft.com/collections/rifles
In France, in the early 1800s, the integrated cartridge was developed, combining bullet, primer, powder, and the firing charge within a casing. The loading times necessary for rifles were significantly reduced.
As for the rest of the century is concerned, further improvements were made for loading and firing the rifles including here the development of the breech-loading mechanisms and refinements to cartridge design.
As you might have expected, most of these improvements were made on the battlefield and after that, they were introduced into other aspects of life, like hunting.
Regarding the techniques of rifle hunting, they haven't changed significantly since World War II, when the German Sturmgewehr-44 was introduced – the very first assault rifle. However, today, for all purposes and intents, most modern rifle hunters use the aforementioned bolt-action technology.
As you can see, the history of hunting rifles goes way back a few centuries and most of the developments in this area were achieved during times of war and later on introduced for recreational use.