"Really" rounded are probably "domed" butt caps. They are usually found when a butt cap is added to a "concaved" handle.
Hope this helps, Capt. Chris


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_________________________
Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com