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The Lapua D166 Revisited

Printed From: Enfield-Rifles.com
Category: Reloading
Forum Name: Reloading .303 British
Forum Description: Enfield-Rifles.com 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!!!
URL: http://www.enfield-rifles.com/forum_posts.asp?TID=10837
Printed Date: October 19 2020 at 8:49am
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Topic: The Lapua D166 Revisited
Posted By: Goosic
Subject: The Lapua D166 Revisited
Date Posted: September 14 2020 at 10:44am
 Some of you may remember that I had experimented with the 200grn .3105" FMJ rebated BT Lapua D166 bullets with a not too favorable end result,"bullet tumbling and keyholes." There may have been an issue with not enough powder used in this instance, and that being 36.0gr of IMR3031.  Since I had no reference point to begin with, I used modern reloading data for the 215grn bullet. The other day brought some enlightenment however. I stumbled upon one sheet of printed paper,dated 1955 that gives specifics on reloading 174 through to 215 grain bullets for the 303B. It is a chart with various powders but I focused mainly on the loads using IMR3031 and as listed: 
174/180grn  37-42.5
200/210grn  36.5-41.2
215grn           36-40.8
This paper also gives a Max. CIP piezo pressure reading of (35925psi) for the 200/210grn test load with a muzzle velocity of 1995 fps.
My powder meter is set to drop as close to 40.0grns of 3031 as possible.  I will load 50 of the D166 and weigh each charge to exactly 40.0grns using my electric scale and trickle charger. I have a bench reserved for Wednesday and my test mule will be my No4Mk1* Long Branch. 
The bullets will be seated .462" with a AOL of 3.050". I will keep everyone updated as soon as this test is over...




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