Rifling characteristics of the Marlin 336c

General Discussion About the 1974 DeFeo Murders and related topics
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scipio-USMC
Amityville Maniac
Posts: 1693

Rifling characteristics of the Marlin 336c

Post by scipio-USMC » Fri Dec 13, 2013 11:01 am

Ron's rifle was manufactured in 1968. That year there were 12 lands and 12 grooves, the lands were .055 inches wide, .0028 inches deep. Marlin used microgrooving meaning they were not as wide and deep as traditional grooves thus more grooves were required.

Revolvers chambered in .38 special by comparison had 5-7 grooves depending on the manufacturer.

Ryan made a big deal about the bullet marked item 33 and claimed it had different characteristics then the rest. The screenshot provided to the news and other websites was not large enough to read. Can someone with access to his part II of Shattered Hopes do me a favor and post a summary of what notes Dellapenna made with respect to item 33 or better yet do so for each bullet if possible.

scipio-USMC
Amityville Maniac
Posts: 1693

Re: Rifling characteristics of the Marlin 336c

Post by scipio-USMC » Fri Dec 13, 2013 11:48 am

The revolver recovered in Canal was an Iver Johnson Safety Hammer Third Model. The 38 S&W version had 5 lands and grooves of equal width (the .22 and .32 versions had 6 lands and grooves)

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