I was thinking about using some of these for a plinking and small varmint round, due to the cheap price ($6.85/100). They are made of a copper/tin composite that disintegrates on impact with hard targets, but the tech I just talked to on the phone said they work well on varmints he's shot. Also, he said that due to being made of a lighter material, they have the profile and wind drift of a 60 gr. bullet even though they weigh only 42 gr. Anyone tried these before? Thanks.

What size varmits? My guess is anything wood chuck size or bigger may be questionable.

As far as wind drift, the advise seems backwards to me. A bullet with the profile of a 60g lead bullet and only weighing 42 grains would drift like a sail boat in the wind.

I'd think for close shots on prarie rats and similar vermin you might be somewhat happy, otherwise they're a cheap way to make noise, but the varmits may be unimpressed.

But you may as well give them a try - then you can write back and show me I'm working on half a deck (my wife would say less).

Well, I called the manufacturer and talked to their tech guy. He says they just sent some bullets out to a ballistics lab to be tested, so he doesn't have a BC for they yet. He says he uses them on smaller varmints quite effectively, and also mentioned that they were working on a 33-gr. HPBT in .224 cal specifically for varminting, with a profile like a 53 gr lead/copper bullet.

Here's what I'm trying to figure out. The only other non-lead bullet I could find a BC on is Barnes. Here's the comparison I found.

53-gr Barnes: BC=0.231
53-gr Hornady: BC=0.229

So, the nonlead bullet, while longer for mass, still has the same BC. So, I don't think the BC for the 42-gr. Sinterfire could be worse than any other 40-45 gr bullet. Worse-case estimate of BC around 0.200. However, when I looked at the 6mm rounds, I found this.

85-gr Barnes: BC=0.401
87-gr Hornady: BC=0.376

So, the Barnes has a BETTER BC despite being longer for mass. So best-case scenario is that they may actually have the BC they claim. I'm going to order a box just to see. Thanks.