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sierra .223 69gr tipped matchking


petesv
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From Hodgdon's excellent website, the data for the 69gr Sierra Matchking, below. Sierra say you can load TMKs to same charge and OAL as the SMK but at AR mag length I found the 77gr TMKs are seated further into the case; I dropped the charge a little.

 

I'd work up from the starting load pasted from Hodgdon, below.

 

BULLET WEIGHT 69 GR. SIE HPBT

Manufacturer Hodgdon

PowderH4895

Bullet Diameter .224"

C.O.L. 2.235"

Starting Load

Grains 24.0

Velocity (ft/s )2,870

Pressure 41,100 CUP

 

Maximum Load

Grains 26.0

Velocity (ft/s)3,069

Pressure 49,700 CUP

 

Be aware, some bullet seating dies will dent the jacket of the TMK, especially if high neck tension, poor chamfer, compressed load. I customised my seater to eliminate the issue.

 

Good luck with the TMKs, the guns ai've tried them in, like them.

Edited by Bangbangman
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  • 2 weeks later...

From Hodgdon's excellent website, the data for the 69gr Sierra Matchking, below. Sierra say you can load TMKs to same charge and OAL as the SMK but at AR mag length I found the 77gr TMKs are seated further into the case; I dropped the charge a little.

 

I'd work up from the starting load pasted from Hodgdon, below.

 

BULLET WEIGHT 69 GR. SIE HPBT

Manufacturer Hodgdon

PowderH4895

Bullet Diameter .224"

C.O.L. 2.235"

Starting Load

Grains 24.0

Velocity (ft/s )2,870

Pressure 41,100 CUP

 

Maximum Load

Grains 26.0

Velocity (ft/s)3,069

Pressure 49,700 CUP

 

Be aware, some bullet seating dies will dent the jacket of the TMK, especially if high neck tension, poor chamfer, compressed load. I customised my seater to eliminate the issue.

 

Good luck with the TMKs, the guns ai've tried them in, like them.

I completely agree regarding the TMK being easy to crimp. I run min neck tension at around 0.001" with bushing dies , neck turning and a careful annealing cycle to avoid it

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