Any 5.7x28 reloaders here?

[GrocMax]

Excel Arms finally is shipping the MP5.7 (sort of a Ruger MkII-III/High Standard clone with an 8.5" bbl) so I had to order one, not a pistol guy but ya gotta have something in reserve for the Zombie Prairie Dogs, right? Plus I always thought the HS/Ruger was dead sexy. Well, OF COURSE I have to reload for it, but in this particular case there is more misinformation than good information out there. I think most of the issue is because of the blowback actions and their extreme sensitivity to a load change. So, anybody reloading 5.7x28 for blowbacks? (other than DO NOT load hot, you will be sorry)

 

[Ohio1]

Check out "fiveseven.com" forums....lot's of info on loading the 5.7!
Hope this helps!

Steve

 

[GrocMax]

Well, that's exactly the info I don't trust. They all talk about the 'lousy brass' because the shoulder moves up .100" or more on fired rounds, without considering its a bottleneck case in a blowback action that the bolt is moving backwards while there is still lots of pressure left in the case. Having a hard time trusting any info, and I always apply Sturgeon's Law to the web- 90% of everything is garbage. Figured this place was the inverse of that law

 

[brfun]

I load for a AR57 witch is also a blowback. other than being such a small case witch is sensitive to load for and the brass not lasting very long dew to the shoulder movement forward as much as it does it is like handloading for anyting else.
work up your loads .1 grains at time. for what its worth i have decent luck with true blue as a powder with cci400 primers. i toss my brass after the forth loading to give you some idea. i haven't had a case separation yet but i don't want one either. i am pushing my shoulders back about .050 each time and trim the cases the first time as they are all once fired then once again before i toss them. it isn't a beginners cartrage to load for but witch attention and caution it isn't bad to load for.
i am not much of a pistol shooter but i keep thinking one in a fiveseven would be fun.
Brian

 

[GrocMax]

Well I must admit the last time I was over there was a year or two ago, there is much better info out now, seems those in the know finally spoke up and quashed the "mee too's" of misinfo.

Disappointed in the lack of Dillon 650 tooling though.

Thanks for the responses.