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: Online Points: 4224	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: 12433	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)