107 Tipped Matchking Revisted

[Londerko]

[grayfox]

I've got one load in my 16er, H335 at 29.7, 2591-ish with SD=9. Haven't shot them much but they ought to do fine. XBR for that weight range seems to be a lot like H335.

[Londerko]

[grayfox]

Memory's too fuzzy... every time I think of working with that bullet something else more important (shooting-wise) comes up that I have to do... after all it's hunting time so all the prep for now is focused on that.
Plus big doin's here at the home-front I have to do... not a lot of free time...
Maybe when things cool back down...

[Gusmeister]

I'm hoping this tread fleshes out with data. I have been using the Sierra 107gr MK and it has shot well all the way out to 1,000 yards. Sierra promises a much better BC with the TMK. I just haven't taken the plunge. Some concerns are that the TMK will be longer than the MK. The 107gr MK is slightly longer than a 123gr Hornady ELD and I don't want to start compressing loads. But Sierra promises more (and charges more) so I am interested in what you guys come up with.

[Londerko]

Gus,
What had been your go to powders for the 107 SMK?
Did you use 8208 at all?

[Gusmeister]

Hey there Londerko,

The only powder I've used with the 107gr MK has been 8208. The best mix of accuracy and velocity came to 29.0 gr of 8208. That is with a Hornady case, CCI 450 primers and an LOA of 2.255". MV in the 20" Odin Works AR-15 barrel is 2,650 fps. I tested 29.2 and 29.4 gr and encountered no obvious pressure problems but found any loads above 29.2 gr started to give powder compression problems (I hate compressed loads). The 29.0 gr load give me a typical 1.6 MOA 1,000 yard groups when I do my part and the wind is down. Accuracy with the 123gr ELD's match the 107gr MK out past 700 yards or so. But at 1,000 yards (actually 1,028 yards) the ELD was yawing, dropping extra fast and giving 2.0 MOA groups.

[Popeye212]

You guys are gonna make me change my order from 120 SMK to the 107's you got my curiosity up also ordered some Lapua 123's and now I gotta buy some Tac

[centerfire]

H4895 would be a good option. On paper the combination looks great. I have TMKs and Scenars for work ups but haven't had time.

[Londerko]

Gus:
Thanks for the load info, that sounds spot on. 8208 seems like and ideal powder for this weight bullet. FYI I saw a picture of the 107smk 107tmk and 123smk all side by side. The TMK and SMK appeared to be the same length and both were significantly shorter than the 123smk. You said a 107 is longer than a 123eldm though, interesting.
Popeye:
Yes, they look very ideal on paper, considering they have the same BC as most 120gr bullets but you should be able to push them 150-200fps faster, they at least warrant investigating. Sounds like good coyote, blacktail and antelope medicine to me.
Centerfire:
I do have some H4895, I will defiantly have to give that a try. Let me know if you do first

[Gusmeister]

I went downstairs and remeasured the 123 ELD and the 107 MK. I said the MK was slightly longer just at the attached pics show. But, bullets (especially JHP) vary in length. So the greater truth is sometimes the ELD is longer and sometimes the MK is longer but we are only talking a few thousandths. So I halfway correct myself.

IMG_9985.JPGIMG_9989.JPG

[Londerko]

Thanks for the measurements 👍
I ordered a box of 107 TMKs today

[centerfire]

108gr Scenars are 1.400".

Thanks for the measurements ��
I ordered a box of 107 TMKs today

TMK is shorter than the 123gr ELDM and 107gr SMK.

[Londerko]

TMK is shorter than the 123gr ELDM and 107gr SMK.

Interesting, that sounds promising

[topcaat1]

1.5 MOA out to 600 yds,, from a 16" barrel with a 4x ACOG.
29.2 grains 8208, Hornady brass, cci #41 primers, OAL 2.255".
According to UPS Ill have my 24" PF upper this Tuesday. With that and my Leupold Mk 4 I hope to get a better idea on the accuracy potential.
107 TMKs seem to live up to their claimed BC.
A lot less expansion on coyotes and pigs than 100 grain ELDs.
100 grain sometimes did not exit.
107 TMKs usually leave a fist size exit, about the same as 123 grain ELDs at 175fps faster. Just about perfect in my opinion.