11/24/2023 0 Comments 338 spectre next to 300 blackout![]() The inside of the die was not rough by any means but i polished up the expander ball and the inside of the die in hoping it would help sizing but still tough as hell. There are hydraulic marks from excessive lube and it did it even with the expander ball taken out. I tore apart the die and there is nothing i can see visually that indicates why it would be doing that. It was very faint on the out side but you can see a line in the new brass on the inside. However after looking at some of the cases I sized with the mix the cases formed with a crack in the same location. I had checked the 6.8 forum before getting into any of this and they reported the same problem forming them. switched to imperial wax and there was still significant chatter. However, some of the brass if using straight lanolin alcohol mix made sizing ridiculously tough. 966 and they chambered / extracted in the rifle fine. Readjusted the sizing die and found they start to stick in the chamber around. Took a look at things last night and got out the hornady comparator just to look at the shoulder of the fired rounds vs what i sized them too. These were the first time these shells were loaded after forming. Unfortunately I do not know what loads produced the cracks in the body, but I will be looking for it in future loads. ![]() If the brass is to small then fire forming the brass and just doing neck sizing from here on out should prevent the case from expanding more. If this is the case I likely have a chamber that is over sized, and I need to contact SBR. Resulting in over expansion of the case and cracks on the body of the case. My thought is either the chamber is too large and the brass may be too small. I can think of maybe one cause, but would like to get input. I've seen small cracks on other cases, usually at the neck or just in front of the head but never anything like this. QuickLOAD lists the max pressure of 37500 PSI.Īs I was cleaning some of the brass I had used to work up these loads I had three cases out of about 30 that had pretty substantial longitudinal cracks on the case body. I.E flattened primers, loose primers, excessive case length growth or ejector marks on the head of the case. I've had some excitement with that (stuck a 285gr Barnes TSX bullet halfway down the bore), despite an obvious squib load, I have not seen obvious signs of over pressure pressure. I just began working up loads last weekend in three different bullets. Starline makes the 10mm Mag brass and I use CH4D dies to neck the brass down to. Similar to 300 AAC Blackout, it was design specifically for launching 300gr SMK's at subsonic velocities. For those who don't know, this cartridge is based on the 10mm Mag necked down to. I've since gotten a 16" barrel and finally finished the AR build. About eight months ago I went on a tour of Southern Ballistic Research (SBR) and discovered a little round called 338 Spectre.
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