The 1907 model has a round receiver with two system mounting screws and is the lightest of these four models. Many ladies and juniors prefer this model for 3-position matches because of its lighter weight.
The model 1913 also has this round receiver with two system fastening screws, but due to the thicker and longer target barrel it is also heavier in terms of total weight and is therefore very popular for the prone position (front load).
1907/1913 rifles are somewhat more front-heavy than the 2007/2013 rifles (due to the heavier case receiver of the 20-gauge Barreled action).
The 20s barreled actions have their centre of gravity closer to the shooter than the 19s barreled actions and are therefore often shot in the standing position.
The model 2007/660 has a heavy rectangular receiver with 4 system mounting screws and a short, 660 mm long target barrel and is therefore also lighter and for this reason is also very popular in 3 position combat because of its lighter weight.
The model 2013/690 also has the heavy rectangular receiver with 4 system fastening screws, but a heavy 690 mm long target barrel and is therefore also the heaviest model. Due to the high weight and the "top-heaviness", this model is a specialist for the prone stop.