170 Lock Base

aam

Sergeant
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Minuteman
Dec 28, 2009
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Local fish & chip shop
Re: 170 Lock Base

Unsichtbar,

I'm waiting for some 170 lb to come in so i can give them a go. Keep me posted on how they perform.
 

Jeffvn

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Apr 26, 2004
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Re: 170 Lock Base

my brother ran them in his .308 for F-Class TR, and he had them at mag length. They were significantly better than the 175 sierra in BC, and he could run them a lot faster out of his rifle.

JEffVN
 

ChrisGarrett

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Feb 2, 2007
2,213
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Miami, Florida
Re: 170 Lock Base

I've run the 150s, 170s and 185 D-46s and they're all pretty good.

Even have some 250s for my 338LM, but haven't shot them yet.

Chris
 

sharac

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Dec 8, 2008
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Re: 170 Lock Base

I've done some testing yesterday with 170 Lockbase:

Thun brass (Lapua is of same capacity and performance)
N540 46gr (i've tested it in extreme heat so perhaps add ,2-,5gr) <span style="font-weight: bold">might be a bit hot load!!</span>
COAL 74,7mm
RWS5341 primer
170 lockbase (hBN coated)
speeds = 2730-2800fps

On the picture are shots 2x45,8, 3x46, 2x 46,2 and to the right with different aiming point (to my surprise basicly overlapping if i'd use same aimpoint) 3x46,5.

PIC
 

sharac

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Dec 8, 2008
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Re: 170 Lock Base

Here are the two 10 shot groups i did yesterday when confirming my final 170lckbase load. Shot also some 155 scenar loads which also look good despite me pulling a few wide...

170lck_462N540_747mm_rws_muromtx.jpg


170lck_46_73_747mm_155sc_46547N540_74_747mmtx.jpg


It was mixed load shooting as my intention was to confirm POI wouldn't change if i mixed (previously known good loads) loads so besides me pulling a few i'm pretty satisfied with result.

Final load is:

Thun/Lapua brass
RWS5341 or Murom LR primer
46.5 N540
170gr Lockbase (hBN coated)
COAL of 73mm
Speeds are around 2750fps and below 5°C add .5gr and above 35°C take away .5gr

Rifle was Tikka T3 Tactical 24" barrel