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<blockquote data-quote="Rez Exelon" data-source="post: 3596080" data-attributes="member: 5800"><p>Ugh. The battle continues.</p><p></p><p>Got to the point yesterday of actually loading up some cartridges for this here project, with the plan being to make a ladder from some Hornady 125gr /W296. Did 20 carts at the book data for 1700/1800fps and then figured it was time to do the scary test. The scary test, is sadly not the "take it out back and see if it blows up the gun" like I wish it was --- because I live in town. No the scary test is "put stuff in a mag and see if it goes in and out of the chamber. And scary was right, because that failed horrifically.</p><p></p><p>Now, I should not here that in making the rounds, they were all resized, got full prep, were confirmed within spec on trim (1.355 +/- .003), and were loaded to Hornady's suggest COAL of 2.100" +/- .002 (some variation due to different headstamps I'm sure here). But when I went to load it, the bolt wouldn't go into battery. I instantly had PTSD to the 22-250 and Browning issues I fought recently. After the flashbacks ended I had to go to work troubleshooting.</p><p></p><p>Couple of tests I ran:</p><p>* Used shorter cases (1.50 +/- .003) with no difference.</p><p>* Seated bullet further in (2.080 target) with no difference.</p><p>* Sized again (multiple times TBH in this process) with no difference.</p><p>* Went to Sports World and got brand new dies (Shout out, they were 44 bucks which is pre-scare pricing even!)</p><p>* Looked for a case gauge but couldn't find one at Academy, Sports World of Jerry's.</p><p>* Tried to find factory ammo as well but it was out except for some 220gr subsonic at SW that I didn't think would make a good test.</p><p>* Made test cases with 150gr Hornady 3037's, some M64 (I think) tracer pulled, and some 1940's m2 ball stuff i had laying around. All the same.</p><p>* Multiple others I might not be listing.</p><p></p><p>Called BCA and they gave me a no hassle RMA label for warranty evaluation, but I was still angry that this was not going better, so I kept testing. I dug through my box of random brass and found a few factory 300BLK cases, and loaded them up. They were juuuust slightly sticky but cycled. So I got the calipers out and started comparisons. Oddly, nearly every dimension I looked at was identical. This left the one thing I should probably have started with --- the stupid stupid shoulder.</p><p></p><p>It's the most annoying part on the case IMHO because it's so hard to get a reliable measurement on it (base to the start/end points for instance) and I'm definitely not going to get to measure the angle. But, I also remembered that in the back of my mind in the PTSD folder, the solution to my 22-250 not going into battery was to sand the shellholder down a smidge. Now, I think that probably works because as the shell holder gets thinner, it goes into the die more and gets more shoulder bump. I don't know a better way to do that with my setup unless I'm missing something. Either way, I didn't get too scientific, I just took a number 4 holder and hit it with 220 to 800 for a bit, blew the dust off and resized some cases with it with no other adjustments.</p><p></p><p>And the dang. thing. worked. that. time.</p><p></p><p>Now, it wasn't a total success, but 7/8 being fine is a lot better than 0/8. But the most curious thing is that even once I got the rounds going in the chamber, with the bolt all the way closed by doing this sizing bumpy thingy (it's a technical term -- look it up LOL), I'm still getting a really curious ring on the projectiles themselves. Basically it's a full circular marking about 2mm up the ogive from the end of the neck of the case. (I'll try to get a picture in the next post). I'm seeing a smidge of the bullet getting pushed back in the case --- maybe .003 at max, but that ring is always there. The only thing I could think that would be making that is if the projectile was hitting the walls of the chamber. Or I could be missing something obvious because I've been thinking about this too much.</p><p></p><p>So now I need to figure out if I should send the upper for evaluation for a couple weeks, or keep working on if my house is in order. I suppose I really should get one of those slotted Sheridan gauges --- that'd've saved me a heck of a lot of time/effort this last day for sure. Either way, I'm apparently not shooting this thing for a while longer.</p></blockquote><p></p>
[QUOTE="Rez Exelon, post: 3596080, member: 5800"] Ugh. The battle continues. Got to the point yesterday of actually loading up some cartridges for this here project, with the plan being to make a ladder from some Hornady 125gr /W296. Did 20 carts at the book data for 1700/1800fps and then figured it was time to do the scary test. The scary test, is sadly not the "take it out back and see if it blows up the gun" like I wish it was --- because I live in town. No the scary test is "put stuff in a mag and see if it goes in and out of the chamber. And scary was right, because that failed horrifically. Now, I should not here that in making the rounds, they were all resized, got full prep, were confirmed within spec on trim (1.355 +/- .003), and were loaded to Hornady's suggest COAL of 2.100" +/- .002 (some variation due to different headstamps I'm sure here). But when I went to load it, the bolt wouldn't go into battery. I instantly had PTSD to the 22-250 and Browning issues I fought recently. After the flashbacks ended I had to go to work troubleshooting. Couple of tests I ran: * Used shorter cases (1.50 +/- .003) with no difference. * Seated bullet further in (2.080 target) with no difference. * Sized again (multiple times TBH in this process) with no difference. * Went to Sports World and got brand new dies (Shout out, they were 44 bucks which is pre-scare pricing even!) * Looked for a case gauge but couldn't find one at Academy, Sports World of Jerry's. * Tried to find factory ammo as well but it was out except for some 220gr subsonic at SW that I didn't think would make a good test. * Made test cases with 150gr Hornady 3037's, some M64 (I think) tracer pulled, and some 1940's m2 ball stuff i had laying around. All the same. * Multiple others I might not be listing. Called BCA and they gave me a no hassle RMA label for warranty evaluation, but I was still angry that this was not going better, so I kept testing. I dug through my box of random brass and found a few factory 300BLK cases, and loaded them up. They were juuuust slightly sticky but cycled. So I got the calipers out and started comparisons. Oddly, nearly every dimension I looked at was identical. This left the one thing I should probably have started with --- the stupid stupid shoulder. It's the most annoying part on the case IMHO because it's so hard to get a reliable measurement on it (base to the start/end points for instance) and I'm definitely not going to get to measure the angle. But, I also remembered that in the back of my mind in the PTSD folder, the solution to my 22-250 not going into battery was to sand the shellholder down a smidge. Now, I think that probably works because as the shell holder gets thinner, it goes into the die more and gets more shoulder bump. I don't know a better way to do that with my setup unless I'm missing something. Either way, I didn't get too scientific, I just took a number 4 holder and hit it with 220 to 800 for a bit, blew the dust off and resized some cases with it with no other adjustments. And the dang. thing. worked. that. time. Now, it wasn't a total success, but 7/8 being fine is a lot better than 0/8. But the most curious thing is that even once I got the rounds going in the chamber, with the bolt all the way closed by doing this sizing bumpy thingy (it's a technical term -- look it up LOL), I'm still getting a really curious ring on the projectiles themselves. Basically it's a full circular marking about 2mm up the ogive from the end of the neck of the case. (I'll try to get a picture in the next post). I'm seeing a smidge of the bullet getting pushed back in the case --- maybe .003 at max, but that ring is always there. The only thing I could think that would be making that is if the projectile was hitting the walls of the chamber. Or I could be missing something obvious because I've been thinking about this too much. So now I need to figure out if I should send the upper for evaluation for a couple weeks, or keep working on if my house is in order. I suppose I really should get one of those slotted Sheridan gauges --- that'd've saved me a heck of a lot of time/effort this last day for sure. Either way, I'm apparently not shooting this thing for a while longer. [/QUOTE]
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