O.K, first things first. please pay respect for all the cases and projectiles that were sacrificed to bring you this data
Lets get down to the nitty gritty………
taper crimp diameter at the case mouth was .472
240g XTP mag bullets
Hornady case with small rifle primer
CCI 450 small rifle mag primers
OAL 2.130″ (case mouth just below the cannelure)
45g = 2202 fps. NO pressure signs
46g = 2287 fps. NO pressure signs (case is sealing well at this point)
47g = 2367 fps. NO pressure signs
48g = 2404 fps. ABSOLUTLY NO PRESSURE SIGNS (accuracy is 1MOA)
NO feeding or extracting problems at all!!!
After returning home i drilled out the primer pocket, seated a 240 XTP to an overall length of 2.130. I then filled the case (AA1680)to the bottom of the primer hole which held 50g of powder, this would be an uncompressed load.
Now, when i used my bullet puller (hammer type) to remove the bullet it broke lose from the case very easily, i then sized the case once again and seated the bullet so the case mouth was over the cannelure (2.080″ OAL) and then taper crimped the case, i then proceeded to pull the bullet with the hammer this time it took 4 good hits from the hammer to dislodge the bullet rather than one hit.
I then reseated the bullet and measured the case capacity which was 48.5g of AA1680 with a 2.080″ OAL.
Holy Cow, you’re doing good work and great pics, a closer, close-up would be better, for a more thorough assessment. Place the cartridges touching each other with the powder weights still visible, then go ahead and zoom on in, let’s have another look at dem-dar beauties, if it will focus… As I can see the shadow ring around the primer, there certainly is no serious flatting of the primer. It’s true, sooting is a function of too little bullet-pull (meaning not enough crimp) or to slow of a powder or not enough of the correct powder (the usual culprit). After you ring out ‘lil gun, my suggestion is to go to H-110 or 296 (their data is interchangeable) and then onto my favorit AA1680. I can’t quite read the speeds, but from the looks of that shooting secession, I sure don’t want you angry at me!
All you guys need to sacrifice a case to find out for yourselves the max internal powder capacity of the case, with the powders and bullets you want to use. The following hints are a real aid in load development and won’t allow you to over fill the case. My method is to drill a 1/4” hole through the primer pocket, cleaning up the burs. Seat and crimp the bullet to the desired depth & OAL, on an empty case. Filling that case with powder through the drilled out primer pocket until the powder is humped up, on the rim face. Now, placing your finger over the full primer hole and the bullet facing the floor, tap the side of the case with a kitchen knife to settle the powder (maybe a dozen or so taps). You’ll see the powder has settled down into the case. Refill with powder again, until the powder is on the top of the rim. After doing this many times and no more powder will go into the case and the primer pocket is completely full and slightly on the rim face, weigh that particular charge. That powder weight represents the perfect compressed load and is the max load you could achieve with the chosen bullet and OAL. Not that-that load is safe, NOT AT ALL, but it is the stopping point, if you make that far in your choices. Some of the powder/bullet/OAL’s choices will allow you to reach that amount of compression without pressure signs and you won’t be wondering if you have too much bullet compression.