The rarity of a squib load occurring with factory .22 RF ammo does not justify the weighing of every round, much less even to concern yourself with it. While the chance of a FTF with rimfire ammo can depend on the quality of the ammo, it in it's self does not produce squibs. Squibs are usually identified by a reduced noise/recoil level and the lack of the bullet hitting the target. This is when one should stop shooting and check for a barrel obstruction.
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