I was in the gun smithing shop of a friend of mine the other day and a fellow came in with an M700 BDL in 7mm RUM. It was a nice looking rifle but was seized shut, the result of firing a handload witha 175 grain Trophy Bonded Bear Claw (TBBC) bullet with, I'm sure the guy told me 100.5 grains or 105.0 grains of IMR 7828 powder. The action was locked down tight and didn't respond to a rubber hammer at all this the result of extremely high pressure, enough to cause the brass to flow at least somewhat. The primer was blown out, this I guess because the owner said he got gas back in his face.
I just wonder does anybody else use that load combo in the 7 RUMMY?
When I asked about the load, the owner told me the 100 or 105 grains ( I don't recall exactly what he said, another good reason not to hand data around that way) and then quickly added, it's a good load I got it from a buddy of mine.(!$#@!$??) Yeah, a buddy who wants to split your life insurance money with your wife. ( I guess some things are best left unsaid, so I didn't really say it) My first thought was that it was way beyond any loading manual...after some research I found it is well beyond any data published for even a 140 grain cup-and core bullet and a TBBC is a solid copper (hardened) base bullet. This type of bullet must use a reduced charge compared to standard bullet.
Well, without further comment about the handloader of the Remington, I'd like to ask; Do people really do this? That is, take load data from any source (other than data manuals) and just blindly dump the components in the case and shoot it because a buddy, or some web site, or even a known professional loader says it "works for me"? I mean, come on! You have to check it in comparison to some other published data and you have to at least know it is close to a normal load. Don't you? Even when we see data in a commercial loading data manual, we still must realize a few things about it.
1. It could be a mistake in print.
2. It may be too much in our gun.
3. Your bullet may be different. (Brand, construction, etc)
4. We must compare it with at least one other source to validate it.
If I see date that list a max of 78.8 grains of XYZ powder with a 150 grain bullet and another source lists 80.0 grains of the same powder with a different 150 grain bullet, I at least feel like they are in the same ball park but if I have no experience with this powder/bullet/caliber combo I'll start well below that listing. And even if a buddy says; "Hey I use 90 grains all the time", I ain't going there! I've been given many loads from friends over the years and some of them wouldn't even fit in the case!
I was in a gun shop some years ago and overheard a guy tell another guy to use 72 grains of 4350 in his '06 to get 3000 fps from a certain bullet. The response from the guy was year, sure, thanks for the tip.($%@#!$%@!#@) After the first guy left I showed a loading data manual to the obviously less learned handloader that revealed the data to be waaaaay beyond normal. The newby loader says; yeah, but he uses it all the time!!
Let me know wehn you get that much powder in a 30-06 case.
Another source of powder charge errors is the difference between powder scales or the difference in loading technique (doesn't know how to operate, zero or read a powder scale). There are many factors that are unknown or out of the control of the handloader. Anytime you cannot validate any load data information, regardless, of the source, forget about it! Drop it and don't use it. Even my data! I make many mistakes, especially typing, not so many at the bench but getting the data written down correctly is always a challenge for me, be advised. This goes double when you see data that is for a powder that isn't normally used in manuals or for any powder that you are not familiar with.
If you see data using Blue Dot for the 45 ACP but don't see it for a 44 special you could intelligently consider the two calibers so close in operating pressure and volume as to extrapolate good date with Blue Dot for the 44 special and you may or may not have the experience to do that. But, when somebody says use 44 grains of Blue Dot for your 38-55 and 255 grains cast bullets, you probably ought to rethink that. (This load was handed around among a few shooting friends and somebody changed a digit in the mix and a 1899 Marlin model 1893 was scattered over three shooting benches.) I think he meant 14 grains.
These kinds of things happen and can lead to serious injury to yourself or an innocent bystander and/or the rapid, spontaneous disassembly of your favorite shootin' iron.