Alamo Posted September 26, 2017 Report Share Posted September 26, 2017 (edited) Loaded some of the Hornady 208 gr HPBT's in .300 BLK. I don't shoot suppressed, so don't care particularly about subsonic loads other than from an academic standpoint to figure out how many grains of powder it takes in my specific gun in case I do want to do the "pew-pew" in the future. Loaded some with 10, 11 and 12 grains of H110. Anybody else loading these for max velocity? According to my calculations it would take 16+ grains of H110 to make a compressed load with this projectile. Hodgdon load data lists max load as 15.6 gr for the 180 gr SPR SP, but doesn't list a max for the 208 gr since it's a subsonic load. I figure maybe 14 grains or so is about right for max on the 208 gr. http://www.hodgdonreloading.com/data/rifle Made 10 each of experimental hollow points by trimming down to 1.3" and 1.2". Will see how low I can go velocitywise and still get expansion. My aim is to have the top 1/3 of the bullet fragment to deliver a lot of initial energy on impact while the big heavy base continues on afterwards to ensure adequate penetration. Edited September 26, 2017 by Alamo Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 27, 2017 Report Share Posted September 27, 2017 Did you weigh the Bullet after trimming some of it off ? Looks a little long on the COL. Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 27, 2017 Author Report Share Posted September 27, 2017 Trimmed weight (+/- 0.1) is 205 for the 1.3" and 202.5 for the 1.2". Wanted to seat them as long as possible to help them feed better with less jostling in the magazine so I started out with the 1.3's seated to 2.250... performed the Redneck Chamber Test and determined that was too long. Moved back to 2.175 and that chambered, but I could feel it was right up on there. Moved back to 2.150 and tested all the rounds to ensure function. 1.2's are seated to 2.050 which follows the same profile, also tested all these as well. Quote Link to comment Share on other sites More sharing options...
Sisco Posted September 27, 2017 Report Share Posted September 27, 2017 I have loaded some 208's subsonic. Work well. Mine were Hornady XLD's. (Extermely Low Drag) Interested in hearing how these perform. Also how they feed. Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 29, 2017 Author Report Share Posted September 29, 2017 Made some dummy rounds to test how they feed from a magazine. The 1.3” feed fine... but the mouth on the 1.2” is a little wide and tends to get caught up on the ramp, so I am pulling those. I also tried seating the 1.3” as far back as 2.050” OAL and they still feed with no problems. No contact with the lands even at 2.150” OAL when using the bolt catch to feed from the mag. I am getting some concentric circular marks on the ogive... perhaps from the feed ramp? Quote Link to comment Share on other sites More sharing options...
survivalshop Posted September 29, 2017 Report Share Posted September 29, 2017 I would like to see some Chono. results if you have one . Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 29, 2017 Author Report Share Posted September 29, 2017 I think the 1.3” version is ready to move on to stage 2 testing . Going out this Sunday, will have some results for both the unmodified and experimental versions . Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 30, 2017 Author Report Share Posted September 30, 2017 Here are the results from when I created the 168 gr version. I’m pretty pleased with them so far. SD is good, hoping to keep it down and even improve as sample size increases. Ballistics chart is for a zero of about 13 yds... 4.7” high at 100 yds ands 4.6” low at 200 still retaining 665 ft lbs of energy at that distance, though I wouldn’t expect any kind of expansion. Expansion is pictured at 50 and 75 yds... expanded diameter difference is apparent from exit hole. Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 30, 2017 Author Report Share Posted September 30, 2017 I think I might try to catch me a Heffalump on the next outing... will post up with some pics if I am successful. Quote Link to comment Share on other sites More sharing options...
Alamo Posted September 30, 2017 Author Report Share Posted September 30, 2017 Here’s the data from the unmodified book load version of the 168 gr, I call it the “Galoot”. The numbers are essentially the same as the Heffalump. I think I will call the unmodified 208 gr version the “Long Eared Galoot”. Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 2, 2017 Author Report Share Posted October 2, 2017 As promised... the tale of the tape: Long Eared Galoots Shot them though my PSA upper 8.5” barrel 1-8” twist. Powder is H110, primer CCI #450. Temp approx 90 F. 10gr OAL 2.260 1183 1251 1236 1181 1260 No pressure Does not engage LSHO SD 37.69 Avg 1222.2 11gr OAL 2.260 1322 1346 1339 1324 1279 No pressure LSHO engages sporadically SD 26.06 Avg 1322 12gr OAL 2.260 1454 1435 1424 1454 1372 No pressure LSHO good SD 33.73 Avg 1427.8 POUS’s (modified hollow points) OAL 2.150 13 gr 1534 1541 1517 1520 1544 Mild flattening Some slight cratering SD 12.19 Avg 1531.2 Jug obliterated at 50 yds... next expansion testing at 75 & 100 yds. I think I will just download the powder for lower velocity to simulate 75 & 100 yds. Judging from the chrony results, each 1 gr of powder increases velocity 100 fps. Looking at the ballistics table, 11 gr should give a velocity at the muzzle approximating 13 gr velocity at 100 yds. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted October 2, 2017 Report Share Posted October 2, 2017 Interesting results . I would check Primer retention of the fired Cases before reloading again . Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 2, 2017 Author Report Share Posted October 2, 2017 3 hours ago, survivalshop said: Interesting results . I would check Primer retention of the fired Cases before reloading again . Roger that Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 2, 2017 Author Report Share Posted October 2, 2017 I think the improved SD on the modified version came from making the projectiles more consistent in length (from the factory, the batch I have varies as much as 0.025”) Quote Link to comment Share on other sites More sharing options...
survivalshop Posted October 2, 2017 Report Share Posted October 2, 2017 27 minutes ago, Alamo said: I think the improved SD on the modified version came from making the projectiles more consistent in length (from the factory, the batch I have varies as much as 0.025”) My next tool is a Bullet uniformer of some type. Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 2, 2017 Author Report Share Posted October 2, 2017 4 hours ago, survivalshop said: My next tool is a Bullet uniformer of some type. Thinking along the same lines, let us know what you end up getting and how you like it. Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 3, 2017 Author Report Share Posted October 3, 2017 Some close ups of the exit damage of the modified hollow points. You can see, distinct and separate from the long rips caused by the hydrostatic shockwave, the jagged circular holes punched as the projectile exits the back of the jug. These holes form a “permanent” cavity where the material is totally missing as opposed to the rips, which can be pushed back together to make the jug (somewhat) whole again. Contrast to the exit hole from the unmodified version. Quote Link to comment Share on other sites More sharing options...
Alamo Posted October 3, 2017 Author Report Share Posted October 3, 2017 I’m definitely down for catching one of these things to see exactly what it’s doing. Need to save up some water jugs, should have something back in the next couple of weeks or so. Here’s some from my caught collection... from left to right: 9mm 147 gr Federal Hydra-Shok Tactical, .45 230 gr Federal Hydra-Shok Tactical, .308 168 gr Barnes TTSX, .45 230 gr Winchester Ranger Talon. Also some pics from when I caught the Barnes... shot immediately after with a Hornady Amax, but that bullet went bye bye... you can see it in the upper right corner of the 2nd to last picture. Quote Link to comment Share on other sites More sharing options...
Alamo Posted November 5, 2017 Author Report Share Posted November 5, 2017 Caught bullets today, .223’s and Blackouts (used a cooler full of wet pack)... left to right: Barnes 70 gr TSX .223, Hornady 75 gr ELD Match .223, Nosler 155 gr CC HPBT .308, Hornady 168 gr BTHP Match .308, Hornady 208 gr BTHP Match .308 Supersonic, Hornady 208 gr BTHP Match Subsonic Some notes: I was very impressed by the size of the permanent cavity created by that little Barnes bullet. 155 gr mushroomed real well, looks like it would make a nice manstopper. 168 gr also mushroomed real nice and kept a good bit of weight in the base, be a good hunting round for larger game. I think the 208 gr Supersonic would work well on a thicker skinned animal like a large hog or even a bear at short range. The tip of the 208 gr Subsonic flattened nicely as well... but I won’t be continuing production on that one, not enough ooomph to reliably cycle the action... will be working up a load with a heavier projectile. Quote Link to comment Share on other sites More sharing options...
Alamo Posted November 6, 2017 Author Report Share Posted November 6, 2017 Stills from the high speed of a 208 gr Supersonic... a lot of energy transfer going on there, some of the water is instantly vaporized into a fine mist. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted November 6, 2017 Report Share Posted November 6, 2017 Excellent reporting! Nice to get this firsthand information. Quote Link to comment Share on other sites More sharing options...
Alamo Posted November 6, 2017 Author Report Share Posted November 6, 2017 The chrony #’s: 208 gr Hornady 9.2 gr h110 trimmed to 1.25” 1090 fps ftf 1103 fps fed next round 1113 fps 1110 fps ftf 1111 Avg 1105.4 SD 9.39 12.5 gr h110 1384 fps 1373 fps 1378 fps 1368 fps 1383 fps Avg 1377.2 SD 6.76 155 gr Nosler CC trimmed to .975” 16 gr h110 1787 fps 1780 fps 1783 fps 1778 fps 1775 fps Avg 1780.6 SD 4.61 Some flattening, mild cratering Quote Link to comment Share on other sites More sharing options...
Alamo Posted November 6, 2017 Author Report Share Posted November 6, 2017 3 hours ago, jtallen83 said: Excellent reporting! Nice to get this firsthand information. Thank you sir... I’m having a lot of fun with it and I haven’t shot my eye out (yet - knock on skull) ... and I’m getting some workable ammunition out of it, so I reckon I’m doing OK so far. Quote Link to comment Share on other sites More sharing options...
Sisco Posted November 6, 2017 Report Share Posted November 6, 2017 Speaking of workable ammunition, anyone have experience with this? It looks like a good price. The rule is in effect, I bought some. http://www.selwayarmory.com/bite-the-bullet-300-aac-blackout-220-gr-sierra-matchking-hpbt-subsonic-950-fps-box-of-250.html Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 7, 2017 Report Share Posted November 7, 2017 7 hours ago, Alamo said: 155 gr Nosler CC trimmed to .975” 16 gr h110 1787 fps 1780 fps 1783 fps 1778 fps 1775 fps Avg 1780.6 This is very close to my standard 300BLK load, Hornady 150gr FMJ-BT and 16.1gr H110. Excellent accuracy and good punch. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.