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The Lapua D166 Revisited Update

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Goosic View Drop Down
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    Posted: September 16 2020 at 1:01pm
I went to the range this morning and tested a new load for the .3105" 200grn FMJ rebated BT. Cases trimmed to 2.215", primed with GM215M primers, 40.0grn charge of IMR3031, bullets seated to a depth of .462 with an AOL of 3.050".
I used my No4Mk1* LB as the test mule. After the initial sighting in was done and the barrel warmed and fouled,  I started the test. The 100 yard grouping pictured was my best with the included called flyer.  Acceptable regardless.  I tried 200 yards and was still satisfied with the results. Not thrilled but none the less, satisfied. It should be noted that the 10 ring is 4"×6". The range master would not score the head shot and would only count the five in X and ten ring. With the increased charge,it was observed that the bullets did not develop a death spin and keyhole the targets. I had fun running the tests but do not care to test any further. With the .312 174grn HPBT the advantages over the 200grn FMJBT are very noticeable and as a result I believe the Lapua D166 bullets should be left to the rifle it was designed for. 
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Shamu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: September 16 2020 at 1:08pm
I agree you wrang them out & are making the right decision.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Pukka Bundook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Pukka Bundook Quote  Post ReplyReply Direct Link To This Post Posted: October 02 2020 at 6:29am
Maybe not a bullet to continue with in the .303  Goosic, but still very interesting, that a bullet of this diameter performs so well in a barrel with grooves likely in the .314" range.
 
I know the Hornady rounds at  .3105" perform V well in some new .303 barrels, and wonder (off topic wondering!)  why we generally use .310-.312 bullets  in the Finn Mosin Nagants, where the bores are often about .3095".
This is just a  generalisation, as it's off topic, and not a thing to discuss here.
 
(But I still wonder!)
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