Second, the primers are wrong so you cannot just swap loads when you form from 10mm mag brass. Powder Burn Rates: H4227 is just a little slower burning than the 4 powders I mentioned in my previous post, and H4227 will work OK. I wouldnt use them, trim length is 1.676' but I have checked to barrels using a neck length gauge and they will accept brass up to 1.695 on one and 1.705 on the other so even trim length is kinda short, 1.685' or 1.690' would be a good safe trim length in both of my barrels and is a good bit over the trim length in the books. First of all the case walls are thicker and max loads need to be reduced by a grain due to less case capacity. The velocity doesn't change that much, but the chamber pressure change makes one safe for your gun and the original not so good. But your max load for H4227 in YOUR gun with 300gr bullet should be 11.7gr or 11.6 gr. The 11.8gr load may work in some other guns OK, especially bolt action guns. Furthermore, this outfit isnt going to function for anything in the real world other than somewhat of a novelty and a fun little venture. So if you just reduce the load by 0.1 gr or 0.2 gr you'll likely be OK, and not pop any primers. 473' boltface does it.338 is the maximum caliber I can support with my current brake/QD supressor set-up. BUT discount any odd and overly short cases, common sense, right Toss those outliers or use for top of pressure signs testing The shorter cases will grow and you can catch them in a couple more cycles. 98.1% fill (not compressed) and 94.9% burnt in a 10.5" barrel.ġ1.8 grains, 38,219 psi, est velocity 1128 fpsġ1.7 grains drops it to 37,337 psi, est velocity 1119 fpsġ1.6 grains drops it to 36,467 psi, est velocity 1110 fps Measure the average of the three shortest cases, add. Now, the 338 Spectre is a 1-6 barrel and the 8.6 is a 1-3. Best of all it runs on the smaller Ar-15 platform.
SBR Ammunition makes barrels, loaded ammo and brass. How do I resize the brass More important than trim length is shoulder set back as this cartridge head spaces on the shoulder. It is called the 338 Spectre and was developed a while ago by Marty ter Weeme of Teppo Jutsu. .338 Spectre brass forming 8191 Views 7 Replies 4 Participants Last post by N164fj, N N164fj Discussion Starter I'm acquiring components to reload for the Spectre and am fairly new to reloading. Quickload shows 38219 psi chamber pressure for your exact load, where max MAP chamber pressure for 338 Spectre is 37,500 psi. What is the trim length for the brass The official length is 1.250 but you can leave it untrimmed at 1.255.
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