You should be fine starting with any 150gr spitzer load data. For branded bullets, Midway lists the length, so if you want to get even closer, find something that is closest in length. As long as you’re using a starting load to start, you should be safe. Compare your results with the published...
No, I haven't had problem with it.
*Edit, only "problem" is that it goes back in storage once I get a box or two of really good brass that I can use for a while.
I had a Tikka T3 in 300wsm that had a tight chamber. Nosler custom/premium brass that is supposed to be ready to load had to be bumped back a couple thou before the bolt would close. Didn’t have an issue with a Winchester factory round though.
I’d look at the M1 service rifle loads. Hornady has a section in their manual and Hodgdon has them published here:
https://hodgdonpowderco.com/wp-content/uploads/2023/04/m1-final-data-1.pdf.
Check your primer pocket and see if you can push a primer back into it with just your finger.
Weigh your spent casings and see if they are close in weight or if that blown out one is a lot heavier than the others.
With the unfired ammo, I’d break them all apart and weigh each powder charge and...
Here is a ballistic comparison of some of the Barnes bullets in .284 and .270 I did a little while back. This was for the 708, but you can still get a good idea of it.
I've heard that too. I think generally speaking, that is true, but the minimum impact velocity on the TSX is generally 1800, but you'd have to check with Barnes support on that 175 flat bottom to be sure. At 400 yards, if you are running it about mid-velocity for the load data, 2600fps, then...
I’d go with whichever of those two shoots the best. You could probably even go with the 175gr TSX and only be a little lower than the 150 TTSX at 400yds. I’ve had good luck with Barnes’s published load data.