G'day All,
In learning how to tune break-barrel air rifles I have been reading all I can about what can be done, e.g. polishing the bores frequent cleaning, ensuring stock screws and pivot blots are correctly tensioned and so on. While examining my Diana 350 Magnum stock I noticed that the cocking linkage was slightly offset and had been lightly scraping the inside of the stock. This appeared to be a manufacturing error of no great consequence in terms of cocking the rifle. However after consideration it occurred to me that the linkage being in contact with the stock might have a negative effect on the tune of the rifle when it is being fired: if the tension of the two fore stock screws in combination with the two screws at the trigger is really critical and the mechanism of the rifle is meant to be sweetly balanced between those three contact points, then pressure on the inside of the stock from the cocking lever might change the balance in action. I found the same issue in one of my old HW 90s. This rifle has been wildly unpredictable in accuracy no matter how I adjusted the stock screws. The cocking lever was pressing firmly on the inside of the stock on one side alone when the rifle was cocked and the barrel locked. Hence I removed some wood from the inside of the stock [where the two parts of the cocking lever are 'spliced' together] so that the lever is no longer touching the stock on either side. There was an immediate improvement in accuracy and groups were tighter. Adjustment of the stock screw started to have an observable effect on accuracy and group size.
Am I right that there should only be three balanced contact/attachment points: the two fore stock screws and the trigger area screws [operating as one contact point] and any other contact between the action and the stock is potentially bad?
Jim
Via Ballarat
Australia
In learning how to tune break-barrel air rifles I have been reading all I can about what can be done, e.g. polishing the bores frequent cleaning, ensuring stock screws and pivot blots are correctly tensioned and so on. While examining my Diana 350 Magnum stock I noticed that the cocking linkage was slightly offset and had been lightly scraping the inside of the stock. This appeared to be a manufacturing error of no great consequence in terms of cocking the rifle. However after consideration it occurred to me that the linkage being in contact with the stock might have a negative effect on the tune of the rifle when it is being fired: if the tension of the two fore stock screws in combination with the two screws at the trigger is really critical and the mechanism of the rifle is meant to be sweetly balanced between those three contact points, then pressure on the inside of the stock from the cocking lever might change the balance in action. I found the same issue in one of my old HW 90s. This rifle has been wildly unpredictable in accuracy no matter how I adjusted the stock screws. The cocking lever was pressing firmly on the inside of the stock on one side alone when the rifle was cocked and the barrel locked. Hence I removed some wood from the inside of the stock [where the two parts of the cocking lever are 'spliced' together] so that the lever is no longer touching the stock on either side. There was an immediate improvement in accuracy and groups were tighter. Adjustment of the stock screw started to have an observable effect on accuracy and group size.
Am I right that there should only be three balanced contact/attachment points: the two fore stock screws and the trigger area screws [operating as one contact point] and any other contact between the action and the stock is potentially bad?
Jim
Via Ballarat
Australia
