07-08-2024, 11:42 PM
This is the main reason I spend time on this forum. I am not familiar with Gordons Reloading tool, but I am very familiar with Quickload, (I've been using it since 2009), and QL also shows Hornady's max load data to be well over the Sammi upper limit for the 6MM ARC.
IMHO the 6mm ARC data is all over the map. I am using Starline brass. Quickload's default case capacity is 34.5 grains of H2O at overflow, my twice fired Starline brass trimmed to 1.480 holds 35.4 grains. I emailed Berger for their data, and what I was sent is so conservative that their loads won't even lock my bolt back until I get near max. Hodgon's loads are sort of the middle ground, but they list loads as "compressed" that don't fill my cases to the shoulder, so you're left wondering if the loads are limited by pressure, or by case capacity. I'm curious where all the variation comes from. Having separate data for bolt guns vs gas guns sure doesn't make it simpler. And, whether all of this data was in fact developed in a lab using a pressure transducer, or maybe just computer predictions? With Quickload adjusted to my barrels particular dimensions, my particular load parameters and my fired brass case capacity, it tracks my results using Varget pretty closely. It also tracked the lower level loads using LVR pretty closely with the 105 Bergers, but the real world velocities and QL's predictions start to diverge as I advance up the load latter. And the 107SMKs on top of LVR don't track at all.
Does anyone have the latest version of Sierra's load manual? I'm not seeing their data online. I have the 5th edition, but I'm too much of a Yankee to pay $50 just to see the 6mm ARC pages in the 6th edition. Why can't they just sell me the pages with new data? I already have the three ring binger with their logo on it, and the other 1,000 pages that didn't get changed for this edition
IMHO the 6mm ARC data is all over the map. I am using Starline brass. Quickload's default case capacity is 34.5 grains of H2O at overflow, my twice fired Starline brass trimmed to 1.480 holds 35.4 grains. I emailed Berger for their data, and what I was sent is so conservative that their loads won't even lock my bolt back until I get near max. Hodgon's loads are sort of the middle ground, but they list loads as "compressed" that don't fill my cases to the shoulder, so you're left wondering if the loads are limited by pressure, or by case capacity. I'm curious where all the variation comes from. Having separate data for bolt guns vs gas guns sure doesn't make it simpler. And, whether all of this data was in fact developed in a lab using a pressure transducer, or maybe just computer predictions? With Quickload adjusted to my barrels particular dimensions, my particular load parameters and my fired brass case capacity, it tracks my results using Varget pretty closely. It also tracked the lower level loads using LVR pretty closely with the 105 Bergers, but the real world velocities and QL's predictions start to diverge as I advance up the load latter. And the 107SMKs on top of LVR don't track at all.
Does anyone have the latest version of Sierra's load manual? I'm not seeing their data online. I have the 5th edition, but I'm too much of a Yankee to pay $50 just to see the 6mm ARC pages in the 6th edition. Why can't they just sell me the pages with new data? I already have the three ring binger with their logo on it, and the other 1,000 pages that didn't get changed for this edition