Originally Posted by Clark
There are white lies, lies, damn lies, and then there are 7mmRM published data.
I can get more power out of hot loads with a 7x57mm Mauser, a lot more, than a 7mmRM with published data.
I can, with 70 gr Re22 and 180 gr VLD, a couple of different 26" rifles both give 3030 fps.
That is shooting sub moa with long brass life.
A published load for that would be 60 or 61 gr.
How did things get so screwed up?
1) The 7mmRM was SAAMI registered at 61,000 psi, and it should have been registered at 71,000 psi.
2) The published loads are almost always WAY less the 61,000 psi. Maybe the problem is more than one rifle cannot share the brass unless a special die is used to size right in front of the belt.
3) The SAAMI chamber head space dimensions are .220" to the end of the belt, but almost no brass is more than .215". When I head space MY rifles, I make them .215" so my brass does not go through as much fire forming torture.
What does it all mean?
I believe that the 7mmRemMag cartridge is the best choice for a long range hunting rifle that has to be carried further than from the vehicle to the shooting bench.
It takes some tweeking to get all that it is capable of delivering.
I'd be interested in knowing where these facts originate from (specifically your comments on pressure) before taking them as gospel and going that far out of spec on my 7mm RM. As you know, we are engaged in a potentially dangerous sport, and the integrity of the information that we stake our lives on is critical. The ramifications for a shooter that pushes pressures beyond what his gun was designed and proofed for could be dire if they were to base their decisions on inaccurate information.
Whilst each of us is entitled to do whatever we want to do with respect to our own loads, I would suggest that we must be wise when sharing those loads with other people. You don't know the quality of my rifle and whether it can handle the pressures that you are talking about or not.
Who dies if it can't .... Not you.
I beleive that we are a knowledgeable, inquisitive and skeptical bunch, and if there was some sort of conspiricy of lies with respect to the 7mm RM load data, then that would have been exposed by now.
This is the first that I have heard these sort of comments and quite frankly, I consider them to be dangerous.