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The Lapua D166 Revisited Update

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Category: Reloading
Forum Name: Reloading .303 British
Forum Description: accepts NO responsibility for any loads that may be used by persons reading this forum. USE CAUTION WHEN TRYING ANY NEW LOADS!!! ANY DATA DEEMED UNSAFE WILL BE REMOVED!!!
Printed Date: October 26 2020 at 4:34pm
Software Version: Web Wiz Forums 12.01 -

Topic: The Lapua D166 Revisited Update
Posted By: Goosic
Subject: The Lapua D166 Revisited Update
Date 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. 

Posted By: Shamu
Date 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)

Posted By: Pukka Bundook
Date 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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