I've generally shied away from compressed loads. Firstly 100% of my reloading has been 45-70, until picking up loading for my son's rifles again and now, my 338 WM. In the gg, more an issue to get a proper fill v. any compression issues.
That said, I'm a lot more willing to push the boundaries with my own weapons than I am for my son's. Hence, the question.
Bullet: Speer Hot Cor .30 cal 150 gr SNFP
Primer: CCI LR 200
Case: WW
Powder: IMR 4350
These flat points are also what I use in his 30-30's. For rough load development and range practice. We will finalize for hunting season on 150 grain Hornady Interlocks.
Data - maximum (compressed noted by "C"):
Hogdon 2022 (using Nos E-Tip 150 gr): 57.5C
Speer (it's own bullet, this 150 gr SNFP): 59.0 (Note - while Max, they do not show this load as compressed)
Lyman's 51st: 57.0C
In other words, Lyman's shows a MAX/compressed load at 57.0 gr IMR 4350; Hogdon MAX/compressed 57.5 gr; but Speer's own data for its own bullet shows a MAX of 59.0 gr, substantially higher than the other two, and it doesn't even shows this as compressed.
In this photo, left column = 57.4 gr, middle 58.0, and right 58.6 grains.
Once the bullet is seated, unless I'm missing what "compression" means, all of these will be compressed. Est. velocity range is L-R 2764, 2800, 2836.
This is a deer load, so it may be that all of these are unnecessarily fast/hot. But regardless - concerns about pretty substantially different maximums, and what the companies deem "compressed," when we're using the same cases. Thoughts?