Been doing that for years with the 22-250 to make 250-3000 ammo...but alas, the good folks at Hornady now make and sell 250-3000 brass, and 25-35 also...Check with Midway, they have both in stock, along with 117 gr. RN Hornady bullets for the 25-35 once again...Jamison has also jumped on that band wagon..
or you could the make 6.5cm from 22-250. i used to have the 6.5cm and early on, there was no 6.5cm brass. so i'd take 22-250 brass and neck it up to 6.5mm it was a little short(col), but nothing to write home about. i think i have some left.
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