3.1grs Titegroup is 15% load density
6.2grs would be 24k psi / 1823 fps
9.3grs would be 43k psi / 2240 fps
12.4grs would be 67k psi / 2590 fps (58% load density)
15.5grs would be 95k psi / 2900 fps (72% LD)
18.6grs would be 131k psi / 3174 fps (87% LD)
21.7grs would be 178k psi / 3440 fps (101% LD)
I'm always leary of loads that will take multiple charges and still fit in the case. A guy could think he had H335 in the powder hopper and start charging cases with 23grs Titegroup
todbartell, that's a nice table. I'm particularly interested in the chamber pressures associated with each charge of Titegroup because I'm using Titegroup. Do you remember your source for this information and, if so, can you provide a link to that information? Thanks.
I've pretty much decided on the charge of Titegroup I'm going to use on the low-fps end of the scale. Now I'm turning my attention more to the higher end -- obviously, the more dangerous end, so I'm going to go a bit Off Topic and moderators should simply delete this post if I've gone too far.
In addition to reduced-load, low-fps rounds, I'd also like to produce a much smaller number that are least somewhat similar to the PMC bronze rounds that I have, which are 55 grain and supposedly 3200 fps. Maybe this goal is simply impossible using Titegroup, but maybe I can get close enough.
I found Wikipedia's information on .223 Remington here:
https://en.wikipedia.org/wiki/.223_Remington
Pressures
Remington submitted the specifications for the .223 Remington cartridge in 1964 to SAAMI. The original pressure for the .223 Remington was 52,000 psi with DuPont IMR Powder. A higher pressure of 55,000 psi (379 MPa) resulted from the change from IMR to Olin Ball powder. The official name for .223 Remington in the US Army is cartridge 5.56x45mm ball, M193. If a 5.56×45mm NATO cartridge is loaded into a chamber intended to use .223 Remington, the bullet will be in contact with the rifling and the forcing cone is very tight. This generates a much higher pressure than .223 Remington chambers are designed for.
I notice on the same source that the 5.56 NATO cartridge is designed for a significantly higher chamber pressure, but the only reason I mention that is because my gun is 223 Wylde caliber, which can supposedly shoot both 223 and 5.56 equally safely, which means its chamber (and bolt, etc.) must be designed to accept the higher chamber pressure. (I won't be trying to turn a 223 Remington round into a 5.56 NATO round performance-wise, so don't warn me against trying.)
If the above chart is pretty accurate, it indicates that a 9.3-grain charge of Titegroup in a 223 Remington-caliber case produces a chamber pressure of 43k psi with a resulting bullet speed of 2240 fps (neither the weight of the bullet nor the length of the barrel are mentioned, but that's OK with me because I'd like to focus solely on the chamber pressure at the moment); and that 12.4 grains would produce a chamber pressure of 67k psi with a resulting bullet speed of 2590 fps, which is well above the SAAMI 55K-psi pressure limit for 223 Remington-caliber cartridges.
To those of you who have used or are using Titegroup in 223 Remington, does all of the above boil down to mean that the maximum charge of Titegroup that can safely be used in a 223 Remington cartridge would be roughly 10 grains, or is even 9.3 grains too much Titegroup to be using in a 223 Remington cartridge? Again, I'd prefer to hear from people who are using, or have used, Titegroup in 223 Remington, espcially those who have marched the charge upward in small increments using a chronograph to confirm the corresponding increase in fps and determined for themselves the practical upper limit of the charge of Titegroup for their firearm.
Thanks.
