I had ordered my 340 gr I-bullet mold from Accurate about 3 weeks ago and was surprised to see it came in on Thurs. I smoked it up and put it on a pair of Lyman handles. Yesterday I melted a batch of lead, heated up the mold and lubed the mold and started casting some bullets.
Honestly I was having one heck of a time getting the cavity nearest the handles to fill properly. The other cavity was casting beautiful bullets right from the get go. But the rear would only fill about 1/2 way and when it did fill all the way the bullet bases were rounded even with a good sized overfill.
It took quite a while to figure out that the mold required a very slow pour from my bottom pour pot. Once I got that figured out I was casting 2 bullets at a time with no wrinkles, voids or rounded bases. Speaking of the bases they were nice and flush. Weights were within 1 gr of each other except for 3 of the 100 or so cast. As far as dimensions, I ordered the mold to cast .452" +.002" -.000" and taking a sample the bullets measured (with a caliper and micrometer) just a tad over .452".