Sierra 107 TMK Load Data

[pods8 (Rugged Stitching)]

I noticed that number 10 was scraped up. I assume due to insufficient lube inside the neck or something. Shot it anyway.

Did you chamfer the inside of the neck?

 

[Q_Sertorius]

Did you chamfer the inside of the neck?

No, that is something I used to do. But the last couple of batches I’ve done (about 200 rounds), I didn’t bother. I guess I should have bothered.

 

[Q_Sertorius]

What resize die are you using? Number 10 sure looks like you have a lot of neck tension.

The RCBS full length resizing die. Out of this batch, that one was noticeably harder to seat. I should have investigated more closely as soon as I encountered resistance.

 

[ztc92]

For anyone chasing quick drop, I’ve been playing with ballistics calculator and the 107’s to figure out if I need to chase any more speed with my 16” barrel.

I’m finding that the 107 at 2700 FPS seems to be the sweet spot. It’s near perfect quick drop to 700 yards at 5000 DA and still within 0.2 mil of quick drop at 0 DA and 10,000 DA.

I think this short barreled 243 should be about perfect as long as I can find a load that shoots.