Sierra #2121 Bullets

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I'm trying to match some Sig Sauer 125gr ammo that shoots great in my Blackout and thought that the Sierra Matchking #2121 bullets was what they used(says in ad they are) but come to find out they are completely different bullets than what is in the Sig ammo. The Sig ammo is a BT and has a cannelure where-as the #2121 does not have either. Did Sierra change their bullet design?

 

[Jdne5b]

2121 has been flatbase no cannelure for the few years Ive been shooting blackout.

 

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Do you know if there is another Sierra 125gr 30cal bullet Matchking they make? I'm beginning to think it's not a Sierra bullet they are using.

 

[ireload2]

I don't think the ad says #2121. It is probably a design manufactured just for Sig.
Sig refers to it as an OTM (open tip match). Sierra's web site does not list an "OPEN TIP"

Do you know if there is another Sierra 125gr 30cal bullet Matchking they make? I'm beginning to think it's not a Sierra bullet they are using.

 

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My bad, the ad says that Sig uses the Sierra 125gr Matchking bullet which the #2121 is the only one I could find. Here's the ad I was referring to, maybe I'm misreading it.

https://www.cheaperthandirt.com/pro...00-fps-20-round-box-e300a1-20-798681514489.do

 

[ebb]

I bought a box of 2121s a few years ago and they were said to be a new design at that time. I am sure there was an older design (doesn't mean better or worse). They make the 2020 (30/30 bullet), 2120,2121,7725 TMK. but the one that sounds like the best to me is 135 grain the 2123. The 21212s didn't shoot as well as 125 grain Nosler ballistic tips in my gun.