3 reversed explanation of astras and sastra as pointed out through a comment.
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I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

AstrasSastras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras Astras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastrasastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.
  • Any object can be invoked as shastra;astra; when Rama was lying with his head on Sita's lap, he was not having any of his weapons with him. However when he understood the evil intentions of the crow, he used a blade of grass to invoke the most powerful weapon brahmastra, just by uttering the required mantra.

Lord Vishnu's Chakra is considered to be the master of all shastrasweapons.

I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Astras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.
  • Any object can be invoked as shastra; when Rama was lying with his head on Sita's lap, he was not having any of his weapons with him. However when he understood the evil intentions of the crow, he used a blade of grass to invoke the most powerful weapon brahmastra, just by uttering the required mantra.

Lord Vishnu's Chakra is considered to be the master of all shastras.

I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Sastras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Astras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These astras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.
  • Any object can be invoked as astra; when Rama was lying with his head on Sita's lap, he was not having any of his weapons with him. However when he understood the evil intentions of the crow, he used a blade of grass to invoke the most powerful weapon brahmastra, just by uttering the required mantra.

Lord Vishnu's Chakra is considered to be the master of all weapons.

2 added 308 characters in body
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I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Astras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.
  • Any object can be invoked as shastra; when Rama was lying with his head on Sita's lap, he was not having any of his weapons with him. However when he understood the evil intentions of the crow, he used a blade of grass to invoke the most powerful weapon brahmastra, just by uttering the required mantra.

Lord Vishnu's Chakra is considered to be the master of all shastras.

I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Astras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.

Lord Vishnu's Chakra is considered to be the master of all shastras.

I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Astras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.
  • Any object can be invoked as shastra; when Rama was lying with his head on Sita's lap, he was not having any of his weapons with him. However when he understood the evil intentions of the crow, he used a blade of grass to invoke the most powerful weapon brahmastra, just by uttering the required mantra.

Lord Vishnu's Chakra is considered to be the master of all shastras.

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I do not have a pranaamam (authentic reference) but I am just repeating what I heard in a religious discourse by Sri. Karunakaracharyar.

Astras are the arrows that are used without any mantra. In the sense that they do not have any power other than obeying physics. Shastras are the divine arrows that are obtained by praying against certain gods. They may not be available in the archer's quiver but can be obtained by chanting the relevant mantra. These shastras seems to defy many physical laws like:

  • They multiply
  • They act like guided weapon chasing the target
  • They invoke destructive force beyond just physical force etc.

Lord Vishnu's Chakra is considered to be the master of all shastras.