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7mm whisper

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Old 02-12-2017, 06:25 PM
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Spike
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Default 7mm whisper

looking for info on 7mm whisper
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Old 02-13-2017, 07:07 AM
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Just do a Google search on it and plenty of information will come up for you!
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Old 02-13-2017, 10:25 AM
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Default 7mm whisper

I looked I could not find much. like the process of expanding 221. Also looking for load data.
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Old 02-13-2017, 12:19 PM
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221 cases can be hard to find. You're better off with a 7mm TCU which is a .223 necked up to 7mm. I have a barrel for this cartridge for my Contender and a handload with a 120 gr Nosler BT is pure death on whitetails.
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Old 02-13-2017, 05:40 PM
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Default 7 mm whisper

I just bought the gun and I have 40 .221 just need to know the best way to form them.
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Old 02-14-2017, 07:46 AM
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Originally Posted by Don Sr. View Post
I just bought the gun and I have 40 .221 just need to know the best way to form them.
Run them through a full length sizing die and then trim 1/1000th off the brass. Clean up the case mouths. Install primer and load with a minimum starting load and the cheapest 7mm bullet you can find (I use blems) and then take it to the range and fireform them to you chamber. Check length with caliper to be sure your case length is still good and then all you have to do is neck size to work up accurate loads.
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Old 02-14-2017, 04:50 PM
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As an add to Flag's post, make sure you are using a TRUE neck sizing die and not just an adjusted FL sizing die to do the neck. That way you aren't bumping the shoulder or sizing any more of the case. Personally, when I fire form, I use the cream of wheat method to fire form my cases. But that can be a little time consuming to find the right recipe of pistol powder load for proper sizing and shoulder forming. You should also learn how to anneal your case necks to prevent cracking/splitting and increase longevity of the case.
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Old 02-16-2017, 08:02 AM
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Default 7 mm whisper

Do you need to size in a 7mm whisper die or can you use something else?
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Old 02-18-2017, 12:22 AM
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Default upon further research

it seems like the rifle is chambered in some form of 357/7mm super mag.Sorry im new at this. Any info would be helpful.
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Old 02-19-2017, 12:25 AM
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I've only seen the prints on the 7mm Whisper. The .221 parent case is the old .222. All the whisper rounds are of course designed for sub sonic loads but your 7mm can be loaded to a little over supersonic. What are your intents for the round. Hunting? Target? Is your firearm a rifle or pistol? Lets start from there and maybe we can work something up for you.
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