Post by hunter01 on Feb 1, 2024 13:01:05 GMT -5
17.8gns of H110 1.6% compressed load shows 1509fps @ 51kpsi.
Bullet length and loaded length plays a huge part in the pressures. So the above is just a big guess.
John Linebaugh told me that when they were doing pressure tests on the 475 that there came a point when compressing more H110 gave less velocity. He said that the Hornady Ballistics guy told him that with the Heavily commpressed H110 that it made the powder burn slower and that's why the velocities started to level off and drop with increasing powder charges.
I don't know if this holds true with the 357mag or not, just something to look out for.
John also said that H110 had a pretty linear pressure curve up to around 60kpsi. So if you get a bigger jump in velocity than expected, you are probably running much higher pressures than expected.
Give us the actual bullet length, loaded length and barrel length and we can adjust the inputs to see where you might actually be.
I appreciate the data! I need to get these chronoed to see where im actually at. I think it will be short of 1500fps by a bit.