I would go .358 or .359 and size down, but that's just my opinion. I'm going to run them through the sizer after coating anyway, better to make sure they're all consistently concentric and smooth on the driving bands. And you never know when you'll pick up something new that likes a wider bullet. Or you might want to try them in .38 spc or something. Maximum compatibility is my motto.
Also, if all you're doing is throwing lead at paper, there are less expensive options that are just as effective. I got a Lee 356-120-TC for around $45 that drops about .3575-.3580 right at 125+/-0.25 gr with my alloy, sized to .357, HiTek coated.
They run great in everything I've put them through, the 6-cav mold lets me produce much faster, and it's a much lighter mold, so it doesn't wear out my hands as fast.
I get slightly better groups with Unique, but I like to load them with 3.5gr of Titegroup, because I can get 2k rounds out of a pound of powder. That's a penny-and-a-half per round for powder, and the lead costs about 2 cents. Add a primer and you're still around 7 cents a round. Perfectly serviceable out to 25 yards, if you aren't looking for knock-down power. And even if you need to adjust the charge up a bit, it doesn't change the cost in a noticeable way.
The NLG mold will make the bullets heavier/slower, so I use the one with the lube groove even though I don't need it. If I were going to get that mold in HP, I would get the NLG to make up for the lost weight of the HP, to keep it at 125. As solids, I'd go ahead and get the lube groove, just because there is a ton of varied load data at 125, so I can try all kinds of alternate powders safely, not so much at 137 or whatever.
Still working my way through this bucket-o-gold. I think I have 1200-1400 left.
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