Group shooting is an essential starting point in any shooting training programme. It develops consistency in the shooter and it establishes a baseline for what the rifle/ammo is capable of before trying to adapt to other conditions. Otherwise a shooter will be chasing errors caused by the group all over the target, especially if they are using a sporterized No.4 with simmons scope - don't expect it to shoot like laser beam
Get an example of the the type of target that will be used for the matches you plan to attend. If you find the rifle/ammo cannot group within the size of bull of the target used at the competition you are planning to attend, you'll need to evaluate your equipment options, or simply go to have fun.
The training process for just about any match:
Develop a group (prone or bench) and learn the aiming point(s) for the target.
Move the group into the centre of the target to be used.
Develop the various firing positions used in the competition.
Move further back and learn the wind, if applicable.
Then start shooting faster (until it starts compromising the group).