300whisper_newbie Wrote :
Quote:
I believe Sierra has load data in their manual for 300 whisper. You can also call them on their 800 number and they'll recommend loads based on what bullets/powders you want to use. Great bunch of guys over there at Sierra, I called for 220 swift loads about 7 years ago and they remembered me when I called for 308 loads last year
You do not need the 3 die set to form brass. The 3 die set includes a neck sizer as well as a full length resizing die. I have the 2 die set with the full length and its all you need to form and reload 300-221 cartridges.
I trim mine after forming, you'll probably end up with sloppy necks if you form 221 brass (see my post on here about crooked necks). I just set my forster case trimmer to trim them even and then fire form them in my rifle. I'll probably trim to 1.350" once they are fully formed. You'll notice that some of the cases have a smaller sholder on one side then the other, these fire-form just fine and look perfect after the first use so don't worry about them as long as you use light loads. I would not load these cases to maximum pressure as they have slightly smaller volumes and will cause excessive pressure.
--Chris
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