GAEP distinguishes roll-crimp models from star-crimp finishers in its catalogue. These names describe different product types and should be checked before purchasing.
Roll-crimp models
The manufacturer lists the steel OTP for round-rim closures on plastic cases and OTC for round-rim closures on paper cases. See the GAEP OTP roll crimper for the version and gauge options sold by ShotCrimp.
Star-crimp models
GAEP lists the BN1, BN2, BN3 and BN4 as star-crimp finishers. Its catalogue also distinguishes STP for plastic cases and STC for paper cases. The BN2 product page identifies the model offered here.
What to compare
Check the closure type, case material specified by the manufacturer, model, gauge and mounting details. Compare products in the GAEP crimper collection. A similar-looking photograph does not prove that two models are interchangeable.
What this comparison establishes
This is a reference to product names, not a ranking of ammunition performance. Choosing one closure type does not by itself establish accuracy, pressure, feeding reliability or safety. Contact ShotCrimp for missing product specifications.
Sources
GAEP manufacturer model descriptions, checked 22 October 2026.