The Lapua D166 Revisited Update

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   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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Goosic Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: September 12 2017 Location: Phoenix Arizona Status: Offline Points: 4918	Post Options Post Reply Quote Goosic Report Post Thanks(0) Quote Reply Topic: The Lapua D166 Revisited Update 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 Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Logo Designer / Donating Member Joined: April 25 2007 Location: MD, USA. Status: Offline Points: 13012	Post Options Post Reply Quote Shamu Report Post Thanks(0) Quote Reply 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)

Pukka Bundook Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February 02 2015 Location: Canada Status: Online Points: 1321	Post Options Post Reply Quote Pukka Bundook Report Post Thanks(0) Quote Reply 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!)