primer differences

[captn-tin]

Getting semi-ready to load about 2500 223, 5.56 rounds. Have 2000 cci 41 primers. Will I notice any difference in the other 500 rnds loaded with reg cci srp, win srp, or fed srp ? Be using 25gr h335 ,Hornady 55gr fmjwc with mixed brass. Any preference as to the other primers I mentioned. Never had any problems with the 41s. Thanks in advance...captn-tin

[highpower790]

If you have a hot load ,the 41s will be less likely to primer pierce.

[Bastard]

in CA, where we complain about mid 50s being cold, you probably won't even notice the difference

[mshill]

Not to hijack the thread but I found a box of 1k cci 450 magnum among my boxes oc cci 400 small rifle primers. I have been using rhe 400s for both 223 (BL-C) and 300 blk (Lil' Gun) and was wondering if the 450s would be usable in either and if so how would I need to adjust where I start my powder load for the ladder(s)?

[edgerly779]

Reduce load half a grain to reduce chamber pressure although they will still be fine in ars.

[the86d]

During the last shortage, I loaded what I could with what I could, and did some testing...

"As I recall" #41's in 9mm with the same charge as SPP's, I got about an AVG of +50FPS (#41's magnum equiv?).

I also loaded .223/5.56 with SPP's of various makes, but didn't chrono, and they shot fine, but I use iron sights at 50, 75, and 100yd, so not sure about pristine accuracy.