7mm 175 Sierra matchkings

[nfa1eab]

Anyone have any experience with them for long range prone? Been using 180 Berger VLDs in a standard 280 Remington. Only target I ever cleaned was with the Sierra 168s. (Probably not the 180s fault) Have any velocity data where they shot well?

Ed

 

[RDavies]

Yes, I use the 175 sierras a lot in my 284. They are easier to tune, maybe more consistant than the Bergers, as in, if the throat erodes a bit, they arent as critical of bullet jump/jam. The node for your 280 if it has a 30" barrel will be at around 2800-2820 fps.
I do occaisionaly use the 168 Bergers in my 7mm and have always been able to get them to shoot better than 180s, except for one barrel in 8" twist.

 

[JERRYHM]

Sierra 175s out of a 284...

10-02-2009 Sacramento 100-yard chronograph testing
Powder = H4831 --- Lapua cases
Bullet ---H4831--- Primer ---- MV ----- SD ---- ES ---- Group --- Comments
S175 ----- 54.0 ---- CCI ------ 2805 ----- 12 ----- 05 ---- 0.738” ------- Jump .025”
S175 ----- 54.5 ---- CCI ------ 2830 ----- 18 ----- 07 ---- 0.494”
S175 ----- 55.0 ---- CCI ------ 2849 ----- 18 ----- 04 ---- 0.728”
B180 ----- 54.0 ---- CCI ------ 2803 ----- 10 ----- 03 ---- 0.475” ------ In .017”
B180 ----- 54.5 ---- CCI ------ 2828 ----- 11 ----- 04 ---- 0.376”
B180 ----- 55.0 ---- CCI ------ 2847 ----- 16 ----- 06 ---- 0.512”

 

[nfa1eab]

Jerry,
Do you have the ES and SD reversed in the post? Numbers would make more sense. I have been shooting the 180s in a 280 at 2,833 fps with good results (H4831sc). I was going to try some Rel 17 to try and get them up to 2,900 fps. I have seen several posts indicating that the 180s like 2,800 to 2,850. Your test seems to say they like 2,830 fps. I am just looking for less wind drift, but don't want to lose the accuracy. Is seeking 2,900 worthwhile? Any thoughts on Rel 17 in the 280?

Ed