Also, before I get started, I am experienced enough to know to work up my own loads from reduced starting charges, chronograph and to look for pressure clues as I go. So, to save some time we don't need to cover that again.
OK here are the background conditions,
When looking to work up a new load, we often search for posts using the desired powder & bullet or we ask for recommendations from others. Load data is abundant on various forums and often is accompanied with OAL and chrono data as well, so far so good.
(irrelevant stuff removed for brevity...al)
Recently I was doing some load research and happened to be looking at one of the "Jeff Maass IPSC Load Lists". As I was browsing I noticed that a lot of the notes indicated the number of ports in the source's compensator or that their barrel was ported. Some of these loads definitely looked high pressure to me, but I realized they needed the gas to work the comp.
Then it occurred to me - what would happen if it WASN'T mentioned that there was a X-port comp attached to this gun? Would that load blow up my uncompensated gun? Even if I reduced it 10% to start? What about the loads I collect from forum posts.... they don't always mention if they are running a comp or not, just that their load works great for them. Lots of what-if's go from there...
I do not have a compensator on my gun and during load development, want to be careful even with reduced starting loads ... if a load is higher than normal to work a comp, the typical 10% reduction for a starting load will also be higher than normal.
Now my questions... awkwardly worded as they are... redundantly asked in different ways. I'm not asking for details of comp. design, as I do know that will make a difference in the final answer, but a rule of thumb would be a good thing to know.
o- How many grains of powder should a comp load charge be reduced if no compensator is present?
o- How much extra pressure does it take to work a typical comp with X number of ports?
o- What affect does bullet weight have on this?
o- What is a typical range (in grains of fast/slow powder) OVER published Max, does the average compensator user load?
o- Do comps and ported barrels affect chamber pressure / max safe load in a similar manner?
Any added info along these lines would be appreciated. I am trying to come up with my own idea of a 'red flag' rule when I think a load is not quite right and that a comp might be used with a particular load recommendation.
Edited by SyberShooter, 03 August 2012 - 10:07 AM.