Problem with svt-40 need HELP

[r22r]

I have a SVT40 and its acting strange. I'v cleaned it up seriously, the gas system work prefectly, the ejection is good, BUT... If I put one single bullet in the magazine and shoot it everyhting works great, altough if i put more than one bullets, say 2, it would either slam fire or EVEN detonate the first bullet upon closure of the bolt! Kinda scary... I use CCI primers, and I reload...Using 42 gr of 4895 and 150gr Hornady bullets. But that's hardly the problem since its occuring upon closure of the bolt. Anyone can help? If i close the bolt with only one bullet in the magazine there's no problem at all...

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[onlycrimson]

Are the primers deep enough? As the bolt slides forward the firing pin probably dimples the primer, like on a Garand. At least it's a place to start.