sandog Posted June 30, 2015 Report Share Posted June 30, 2015 (edited) Yesterday I was shooting my Oracle .308 and had a slam fire. I have been shooting since I was 12, 45 years ago, and enlisted in the Army in 1975. I've shot a few rounds through self loading rifles. But this slamfire was a first for me. I was using Hornady brass, Winchester LR primers and W748 powder under Hornady 150 gr. FMJ bullets. I was certain that all primers were seated below flush, I check twice before charging with powder. I was under the impression that Winchester was a harder primer, but an aerospace engineer friend told me the Winchesters were very hard when they still used a nickel cup, but since switching over to a brass one they are now one of the softest. I went to several stores yesterday looking for CCI #34 primers but there were none to be had. My friend told me he has dissected various primers, and to him the CCI 250 mag primer is essentially the same as the #34. I will try some of those until some of the #34's are in stock here. I might add that the round fired when I hit the bolt release to start off another 5 round string. I would think the bolt velocity would not be any more than if the bolt was cycling from a previous shot. The DPMS rifles do seem to have tighter chambers than others I've fired. I have had no chambering problems in my .308 when sizing with a regular Full length die. Another friend, who bought a 5.56mm Oracle when I bought mine, was having problems with the bolt seating fully using brass that he full length sized. ( and O.A.L. was correct.) I checked the rounds he loaded in my L.E. Wilson cartridge gauge, and all inserted fully, no tightness. His is the first semi-auto rifle I've seen that might actually need a small base sizer. So far, I have swapped out the factory stock and grip for a Magpul ACS and Moe+ grip, Got the trigger down from 7 1/2 pounds and gritty to 5 pounds and smooth, a Troy Medieval muzzle brake, and added an ambi safety, Norgon ambi mag release, P.O.F. Rattler ambi charging handle to make it more "Lefty friendly". Next up will be some Troy or Samson BUIS, an adjustable low profile gas block, heavy buffer and spring, and an Apex F.F. tube, and eventually a better aftermarket trigger that doesn't have a mile of pretravel. Still trying to decide about an optic to replace the cheap 2-7x shotgun scope that on there now just so I can have some sights to get out and shoot it. Thinking about getting a Leupold VX-R 3-9x with Ballistic FireDot. I was shooting Hornady 150 FMJ's in Hornady brass with W748 powder, and Winchester LR primers. I had started another 5 shot string and hit the bolt release to chamber a round. The carbine fired when the bolt slammed forward. It was angled down and to the right when it firedslightly in relation to the target frame, and just missed hitting the tripod my chronograph was sitting on. Edited June 30, 2015 by sandog Quote Link to comment Share on other sites More sharing options...
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