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Posted: 5/27/2012 8:44:54 PM EDT
| I loaded up some 300BLK rounds with a 125g Speer TNT bullet seated to 2.060". I went to chamber them, and they didn't seem to be seating into the chamber all the way. The bolt would get stuck, and I would have to tap them out from the muzzle. I am suspecting that I need to seat the bullet deeper, but just wanted to make sure there wasn't another issue I might be overlooking. Thanks. |
| Neck diameter of the loaded round is larger than the .334" Maximum. Crimping bulges at mouth/neck/shoulder. COL to long. Turn the FL die down more, push the shoulder back. [SAAMI Measurements/Drawings |
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Well if you don't have any sophistacated tools you can still get a decent (but not perfect) OAL to rifling in this method I got from the Nosler manual;
-empty rifle of course -close bolt -insert cleaning rod to bolt face -mark rod at muzzle with pencil/marker or I find masking tape right up to the crown works better -remove rod -insert bullet (not cartridge, BULLET  ) lightly hold into throat with a pencil or similar rod
-reinsert cleaning rod to bullet tip while holding the bullet in place with your pencil -mark rod at crown again -measure between marks, that's your cartridge length to touch the rifling. Do make sure your cleaning rod and tip don't pass by the bullet tip or you'll get a bogus measurement. This is more readily accomplished with a matching diameter cleaning rod and a blunt tip and not a patch holder or pointy jag. The male end of the dewey rods is pretty good for this. |
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Quoted: I loaded up some 300BLK rounds with a 125g Speer TNT bullet seated to 2.060". I went to chamber them, and they didn't seem to be seating into the chamber all the way. The bolt would get stuck, and I would have to tap them out from the muzzle. I am suspecting that I need to seat the bullet deeper, but just wanted to make sure there wasn't another issue I might be overlooking. Thanks. When seating bullets for 300 blk; "seat the bullet so that the part of the ogive that's about .250 in diameter is behind the two ridges on the inside of an AR mag." Quoted from a 300 blk reloading article from Guns and Ammo, Jan 2012. Author was Steve Gash if you want to look up the article on line. Load one of your rounds in a mag and compare. Good luck
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Finally got a chance to sit down and figure out my problem. After eyeballing several rounds, it looks like my seating die is seating the bullets slightly canted, putting a small bulge in the case neck. Ill try to get pics soon, but it looks like it was doing this on about half the cases. I looked at some rounds I had loaded with Nosler 125g ballistic tips, and all of them appeared fine. They also cycled in my rifle just fine as well.
Any thoughts on the Speer 125g TNT bullet, or should I take my seating die apart? |
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