Did your neck sizing die have the full expander in it? Most come with 2 different pieces to hold the decapping pin - a small one and one 1thou under bullet diameter. Use the larger one which will size the neck internal just under the bullet diameter and should give you consistent neck tension...
I am using 300 WSM mags from alpha industries. I have the 10 round version. In testing with the dummy rounds they have fed fine. I will know more when I get out to the range.
.300WSM Magazines
I also shoot H4350 behind the 80gr TTSX. I have not used it long range so I am not worried about the velocity as much. At 45 grains I was getting 3268 velocity.
Last year I was using 44.0 gr with 0.5" groups. This year I dropped to 43.5 gr and the group with a flier was 0.5". I am...
When I was in college I bought my first gun. Brimming with testosterone I just had to have a magnum. So a 7mag was in the rack. That particular gun has always had some issues and is not consistent enough for me. It is lightweight and it starts to put a good thumping on you at the range...
What state(s) do you hunt big game in most often?
Texas
What is your primary long range hunting cartridge?
7MM Rem Mag
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Regarding your primary long range hunting cartridge choice above:
Do you use factory ammunition?
No
If so, which brand and...