Thread: Sierra Matchking 308 125gr HP for huntinf

Well, the Sierra 125gr MK #2121 arrived today.
I have cut 1 in half (bottom) tested the lead hardness and measured the copper cup thickness. Along with a few other bullets i had sectioned in the past.
When i cut it, it was obvious the copper was very hard. Although i cannot compare that ATM.



Note the lead hardness is about average and cup slightly above average thickness.

It was immediatly obvious that drilling the tip could not happen without filing the tip. And the cavity behind the tip was large so filing the tip off seemed the obvious thing to try. After filing the tip off by about 2.5mm and cleaning it up i ended up with a HP of about 1.3mm and 1gr lighter bullet.

I reckon these will work fine with the tip filed same as i did up to fallow.

Now, just need to find a nice mild load and a jig to make filing them easy and consistant.