WFT needs adjustment for newly formed brass

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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AR-300
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WFT needs adjustment for newly formed brass

Post by AR-300 » Mon Feb 24, 2020 9:57 am

Using WFT set up for already fire formed brass, works great.
Then I chopped a lot of LC, formed and trimmed with WFT and it is too long.
I guess because the trimmer indexes on the shoulder, and formed shoulder sits differently, that length is affected.
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PSA 10.5" & 16'' FN CHF CL 300 AAC Blackout

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dellet
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Re: WFT needs adjustment for newly formed brass

Post by dellet » Mon Feb 24, 2020 12:14 pm

Don't adjust the trimmer if it came out longer after forming in the press. Wait until it is shot at least once as a super, then formed again. The case generally shrinks as it fills out in diameter and the shoulder tends to move forward so you will have less neck.

If you trim to length before fire forming it will probably be shorter than your other cases.
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