Hey folks, I could use a bit of advice regarding reloading rifle rounds. These are 300 Blackout specifically and the issue I'm struggling with is the seating depth of the bullet per reloading spec and what I'm coming up with in QuickLoad. Specifically, I'm using a mix of Hornady and Barnes brass and 150g Hornady FMJ bullets. The powder is H110 and the initial charge is 15.2g. Per the reloading data provided with the Lee dies and the Hogden website, the COL should be 2.235 with this load. The issue is that this leaves the bullet hanging out the end of the case with very little case contact between the beginning of the boattail and case mouth. The cannelure is quite a way outside of the case. To get the bullet seated in enough to bring the case mouth to the cannelure, the COL is all the way down to 1.990. Per the QuickLoad app, this is safe for 15.2g of H110 under a 150g Hornady FMJ boattail bullet. But, it's way off of the published data.
So, would you go with the published data that has very little case contact with the bullet sitting with the cannelure sitting well outside of the case mouth or would you trust QuickLoad and seat it as low as it takes to bring the case mouth to the cannelure to allow proper crimping? The published min OAL for the loaded round with a 150g bullet over H110 is 2.235. With other powders, the 150g bullet is as low as 2.140.
How important is it to seat to the cannelure? Is it important at all?
So, would you go with the published data that has very little case contact with the bullet sitting with the cannelure sitting well outside of the case mouth or would you trust QuickLoad and seat it as low as it takes to bring the case mouth to the cannelure to allow proper crimping? The published min OAL for the loaded round with a 150g bullet over H110 is 2.235. With other powders, the 150g bullet is as low as 2.140.
How important is it to seat to the cannelure? Is it important at all?