Best powder for 175 Sierra MKs

R

robertb

New member
What powder do you guys find works best with Sierra 175 Matchkings? I've been using Varget and have tried RL-15. Varget worked best in my LTR but doesn't in my custom .308 24" barrel.
 
Why?

Did you try Optimum Charge Weight loads or do a ladder test, what primers ( BR-2's?) seating depth changes??? :confused: Friendly reminders that we do not have enough data to advise you thus far. Cordially, Overbore
 
I apologize...I'm attempting to use Varget powder with Lapua brass, CCI BR2 and am loading SMKs @ 2.810. Is there a better powder in terms of consistency that I could try? Some mentioned IMR/H4895. I have tried RL-15 in the past and wasn't too impressed. I have tried OCW and this is what I saw with my chrono when firing from a 95 Palma chamber with Krieger 24" 1/11 twist:


42.7gr
2552
2549
2558
N/A - Error
ES-9
AV-2553
SD-4.6

42.9gr
2563
2553
2555
2574
ES-21
AV-2561.3
SD-9.5

43.1gr
2590
2577
2590
2588
ES-13
AV-2586.3
SD-6.2

43.3gr
2587
2628
2618
2588
ES-41
AV-2605.3
SD-20.9

43.5gr
2607
2602
2619
2612
ES-17
AV-2610
SD-7.3

43.7gr
2619
2649
2628
2613
ES-36
AV-2627.3
SD-15.8

43.9gr
2641
2649
2657
2641
ES-16
AV-2647
SD-7.7

44.1gr
2663
2652
2646
2659
ES-17
AV-2655
SD-7.5

44.3gr
2676
2679
2665
2665
ES-14
AV-2671.3
SD-7.3

44.5gr
2691
2709
2672
2667
ES-42
AV-2684.8
SD-19.2
 
robertb said:
I apologize...I'm attempting to use Varget powder with Lapua brass, CCI BR2 and am loading SMKs @ 2.810. Is there a better powder in terms of consistency that I could try?

44.3gr[/b]
2676
2679
2665
2665
ES-14
AV-2671.3
SD-7.3
Click to expand...


Mr. Robertb can you believe, that this somehow may be a good start?

Con
 
The 43.5 gr. load looks very good if you look at the velocity numbers.
You will have to shoot more rounds with this load to proudce a good SD.
Try 15-20 rounds and if tou keep the velocitys as close as the four you posted you will have a winner.
 
Use a faster powder.

Varget and RE-15 work better in longer barrels. With the 20" tube of the LTR, you would be better off using a faster powder, such as H-4895.
 
If you are leaning towards a shorter barrel and faster powder, don't forget IMR4064 in your testing.

JeffVN
 
The load I'm trying to find is actually for my KMW (Krieger 24" tube 1/11 twist). I had mentioned that I found a decent load for my LTR using Varget.
 
My 24" Patriot Arms broughton 12 twist .308 preferred RL-15 for the 175 smks, but a close second was IMR 4895. It hated Varget, and the lot to lot variances didn't help any either. I found H 4895 to be a bit faster and higher pressure, which was a bad thing in Houston, TX during the summer.

JeffVN
 
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