Cut down USGI brass vs. civilian brass?

[Grunt]

Totally new to the 300 Blackout here. I want to reload some Hornady 110 grain A-max bullets with Hodgen 110 and CCI #34 primers in cut down USGI cases. So far, my google-fu has not been strong. No luck with charge weight but an even more pressing question would be does charge weights given for civilian brass need to be reduced for 300 Blackout in the same manner it would be reduced for the parent USGI 5.56mm NATO case a compared to .223 Remington? Any suggestions?

[dellet]

Totally new to the 300 Blackout here. I want to reload some Hornady 110 grain A-max bullets with Hodgen 110 and CCI #34 primers in cut down USGI cases. So far, my google-fu has not been strong. No luck with charge weight but an even more pressing question would be does charge weights given for civilian brass need to be reduced for 300 Blackout in the same manner it would be reduced for the parent USGI 5.56mm NATO case a compared to .223 Remington? Any suggestions?

Just start at the bottom end of the data and you will be fine. There are some pretty significant case capacity differences in different manufacturers brass, so until you get used to how what you are using, will perform in your rifle, just start low.

There is data for that combination in the Hornady manuals and on Hodgdon's website. Both are good sources to have and use.
http://www.hodgdonreloading.com/data/rifle

Probably won't have much luck using the CCI #34's, but if you want a Mil Spec primer the #41's work great, or most any other small rifle primer

[Grunt]

LOL, yeah, guess you couldn’t tell I’ve been doing a lot of reloading 7.62 NATO and .30-06. So used to thinking of CCI #34 primers I was still thinking of that larger primer size than the CCI #41 small rifle primers. Oops.

[dellet]

LOL, yeah, guess you couldn’t tell I’ve been doing a lot of reloading 7.62 NATO and .30-06. So used to thinking of CCI #34 primers I was still thinking of that larger primer size than the CCI #41 small rifle primers. Oops.

The 34's can fit with some effort

[plant.one]

The 34's can fit with some effort

with a big enough hammer almost everything is possible