These snap caps fit and cycle in IOF .3006 rifle pretty well. These are very essential to teach basics of rifle to new shooters safely. Only concern is that they are made of plastic, so I can't say how long will they last. Cost seems ok because last time I checked a single snapcap price was more than 900 rupees, so 600 is not that bad.
OmniaPlast SnapCap | 30-06 Spring
We recommend that you always use the click cartridge for dry practice, whether or not the manufacturer recommends it. The click cartridge is also suitable for identifying and improving the recoil comb. These click cartridges have a durable metal base that significantly extends their service life.
Simple but functional click cartridges for most bullets. When using a click cartridge, it is safe to fire the weapon empty, for example during dry training.