JC275 Posted June 25, 2013 Report Share Posted June 25, 2013 I have bags full of once fired .243 cases but need 7mm'08. Can I easily form one into the other? I don't have the 7mm'08 dies yet. Thanks, JC. Link to comment Share on other sites More sharing options...
gbal Posted June 25, 2013 Report Share Posted June 25, 2013 I have bags full of once fired .243 cases but need 7mm'08. Can I easily form one into the other? I don't have the 7mm'08 dies yet. Thanks, JC. 243 through 260rem neck die,then through 7-08 (FL,at least first time) seems a possibility ,though I have not done it.... Link to comment Share on other sites More sharing options...
kent Posted June 25, 2013 Report Share Posted June 25, 2013 Your necking up a MM however I should just purchase 7-08 rem brass and be done with it. I had both for quite a while and also a .308, it got real confusing. if you must alter brass I should run .308 down and watch for thick necks Link to comment Share on other sites More sharing options...
furrybean Posted June 25, 2013 Report Share Posted June 25, 2013 I got thick necks and over pressure early doors when necking down from .308 so ended up neck turning. Once fired lap and a K&N kit still worked out cheaper than Nosler brass and Im getting very good results Link to comment Share on other sites More sharing options...
Laurie Posted June 25, 2013 Report Share Posted June 25, 2013 243 to 7mm is a big step-up and may cause problems, especially with many times fired brass, unless you anneal the necks/shoulders. Even then, you'll likely produce a 'doughnut' at the base of the neck caused by moving the neck-shoulder junction position. Before Lapua started making .260 Rem brass, it was common to use the company's very good 243 cases and neck them up in a single pass - but it almost invariably produced the 'doughnut', a thicker ring of metal that intrudes on the inside walls. If your COAL is such that the bullet shank is above the 'doughnut', no problem - but if you push the bullet through it (easily felt on the press handle by a large increase in pressure needed towards the end of the stroke), it usually causes a large increase in group size. Link to comment Share on other sites More sharing options...
JC275 Posted June 25, 2013 Author Report Share Posted June 25, 2013 Thanks guys, I think I'll forget the idea and buy some new cases. Cheers. Link to comment Share on other sites More sharing options...
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