ok guys need your help. i got my custom build back from a great smith, rem 700 fitted with a PTG bolt and fluted firing pin. the firing pin is bushed. here is the deal. was having issues with primers not going boom. called PTG and they sent me a new spring. sent it to the smith and he said it was the same spring as before. he replaced the factory spring with an extra power spring. i'm shooting lapua brass, 130vlds varget, and CCI 450's. it would not even light a BR-4. what I'm getting now is about 25% misfire(primers do not go off) with the 450's. primer strikes look exactly the same on the fired rounds as the misfired rounds. that's what doesn't make sense to me. it's not light strikes. i can feed them through again and they won't go bang. so i thought i was getting smart and was going to test in the house. i bought CCI 400's. Federal 205's got out the 450's and the BR-4's. i loaded them up in lapua brass(no powder, just primers) i cannot get anything to misfire with just primers, and i know that if i went out shooting with loaded rounds i would get the same misfires. i pulled the bullets and powder from the misfired rounds from yesterday, and fed about 12 of them through the gun. all but 1 of the primers went bang. the failure rate of around 25% is over multiple range trips with both springs installed. i don't know what to do. i first thought it was the gun, then i thought it was the CCI cups because i thought they were supposed to be a harder metal. but i can't replicate it with just primers. what am i doing wrong!! please help. thanks again guys for your input!