sean223 Posted January 11, 2016 Report Share Posted January 11, 2016 Hi all. Am loading for 223 Remington and I've had a couple of peirced primers. Am loading 77gr TMK with 24gr RL15 and cci400 primers in Lapua brass. Am going to change to cci450 magnums as I couldn't get any BR primers. Will the same load be ok or will I have to drop .1 or .2gr? Am changing because am thinking i need a thicker cupped primer for the heavier bullets. Cheers. Link to comment Share on other sites More sharing options...
Bianchi Posted January 11, 2016 Report Share Posted January 11, 2016 Hi, Have you read Laurie's comments regarding this? http://ukvarminting.com/forums/topic/31672-magnum-primers-in-small-cases-222223/?p=256105 http://ukvarminting.com/forums/topic/31672-magnum-primers-in-small-cases-222223/?p=256826 Suggest that the required drop will be significantly more than .2 grn when transferring to CCI 450 magnum primers in a small volume case such as a .223. A reduced starting load of 22 grn may be more prudent. Had a similar experience when moving from CCI 400 to BR-4s with 77 SMKs in a .223 and it cost me a box of Lapua cases. Link to comment Share on other sites More sharing options...
Mattnall Posted January 15, 2016 Report Share Posted January 15, 2016 24gn RL15 is a fairly light load generally for the .223 and 77s so you shouldn't have any problem. Recheck zero afterwards to see if it has made much if any difference. Link to comment Share on other sites More sharing options...
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