I am looking for some info from people who know Maynards. I recently purchased a Maynard 1882, with a non-matching 1882 barrel (Serial number on tang is 13,XXX and barrel is 22,XXX)  that appears to be from a No. 10 or higher model in 35-40 Maynard.  It has a mint bore that slugs at 0.360 groove and 0.351 bore.  I did a chamber cast and the case is exactly 2.00” long without the rim and the base diameter is 0.410” so far so good. The question is that the chamber diameter at the case mouth is 0.399”, which seems to me to be very oversized for a 0.361 or 0.362 bullet.  Is this typical of 35-40 Maynard chambers?  Was original Maynard brass that thick at the neck? The book on cartridge conversions shows a neck diameter of 0.390” which seems too small for a 0.399 chamber. 

Deadeye Bly wrote on Feb 16^th, 2026 at 9:40am:


I ran an analysis on Starline, Win. & Rem. brass some time ago.  Rem. was the thickess.  But that was .45-70.  So, 38-55 may be different but I doubt it.  Note that Starline is the heaviest due to the thicker web, & has less case capacity for the same reason.

Wayne