View Single Post
  #216  
Old 05-11-2022, 12:43 AM
Tilleyman Tilleyman is offline
Senior Member
 
Join Date: Apr 2013
Location: VIC, Australia
Posts: 352
Default Just a reminder about trim lengths...

Case trim length to 1.355" MAXIMUM is vitally important for initial fireforming so the danger of excessive length and subsequent pressure spikes are reduced.

SAAMI 17 Hornet nominal chamber length is 1.3565" +0.015"/-0.000" meaning a maximum chamber length of 1.3715"
SAAMI 17 Hornet nominal case length is 1.3500" +0.00"/-0.020" meaning a minimum case length of 1.3300"

Reforming from 22 Hornet and trimming to 1.355" for fireforming is 0.005" over SAAMI maximum case length but still 0.0015" under nominal SAAMI chamber length and 0.0165" under SAAMI maximum chamber length.

After fireforming trim length should be between 1.3300" and 1.3500"

https://saami.org/technical-informat...mber-drawings/
Reply With Quote