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Sept is "vintage stuff" sale month in Indian Lake NY. Vendors come from far and wide and set up tables all through town. Yesterday was a big find day. A full box of vintage 32-40 to go with my circa 1904 mod 94. The other was a box of 1000 Fed 205 small rifle primers and the reason for posting here. Currently I load 300 Hamr and 6.8spc with magnum small rifle primers. I know these are not magnum but bought anyway as a just in case purchase since components are so hard to get these days. If needed to use them for 556/300hamr/6.8 in an AR rifle would I be that be to risky for slam fires
 

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The Shadow (Moderator)
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Federal being basic compound, is easier to have things go awry if they don't have the anvil height for "mil spec" sensitivity.
 

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Note that the anvil trick for lowering sensitivity is CCI's only. Federal's military sensitivity match primer (GM205MAR, the AR meaning it is intended for AR-style self-loaders) lowers sensitivity to fit the military H-test requirements by using a thicker cup (according to the email they sent me when I asked them about it).

Federal does not make a magnum SR primer, so you can infer they feel their standard SR primer will handle both magnum and standard ignition requirements.
 
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