1. 

   BTPost Stumpy Old Fart,Deadman Walking, Snow Monkey Moderator

   Good old Bullseye Powder is nice and fast, and can be used clear up to 44Mag... It should be able to power a 55 grain chunk of lead down a 10.5 “ barrel and be completely burnt before the lead leaves the barrel.... Start out using a tame 9mm loading, using small Rifle Primers, and then build up to the accuracy loadings you desire...
   

    

   BTPost, Oct 18, 2020

   #21
2. 

   oil pan 4 Monkey+++

   You could use bullseye in 5.56 but you could only use a few grains. I doubt it would cycle a gas operated gun and there would be so much empty volume in the case they would never fire off consistently.
   At least with RE7 I think it would fill the case around half way so they would likely fire off consistently and I would expect it to cycle a gun.

    

   oil pan 4, Oct 19, 2020

   #22

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