Post by HMC710 on Jul 11, 2020 17:29:06 GMT -5
Been asking a lot of lubrication questions lately and of course there are plenty of opinions.... more on that later...
Also been doing more research on the 357 Sig and where it officially head spaces. We only have two choices (because I don't count the extractor....) and most responses say the Sig headspaces on the MOUTH.
However, according to the CIP which is the European version of SAAMI stated back in 2007 that the sig headspaces on the shoulder.
Then I started measuring ammo and am amazed at the variation we were seeing. A shout out to Remington as the clear winner on extreme spread and std dev on sizes. Far better than the Winchester, Fiocchi, and S&B I measured.
Then I asked for chamber and ammo prints and was further shocked at the clearances in these chambers. The explanation is that with defensive rounds, going bang is the #1 goal. If there are any questions, see Rule #1
Talking with shooters that use the Sig, the large qty shooters reload to their chambers and figure where they need to size to just bump the SHOULDER back. We are building a lot of DI sigs and have a new reamer coming to tighten up some clearances.
Back to lubrication. I have always felt that ANY lube is better than no lube. Where lube fails is if it is too light for the purpose and fails, or dries out after long term storage and gunks things up. As with anything, there are many opinions on lube type and use. I will tell you one thing: An AR runs much better when lubricated in the right spots, and that pretty much means anything that moves. Read a post last week about a product called Cherry Balm so I searched that out and have attached the link. It is a good read and form your own opinion.
www.arbuildjunkie.com/ar-15-lubrication-an-interview-with-cherrybalmz/
It does reinforce what I have always thought about sliding metal surfaces: use grease. The problem with the AR (in my opinion) is that grease attracts dirt. This is where some of the new coating technology comes into play. But after reading that article, I greased up one of our test uppers and it made a noticeable difference, so we are going to do some more testing. Again, with the AR putting 1000 deg hot gas into the BCG, a good lube is important and I've been using synthetic oils. We'll see how the greased pig holds up.
And, speaking of hot has in the BCG, which started this whole process.... We have two 357 Sig Piston set ups running. For those of you that have been around here for a while, we started by rechambering one of our Gen4 9mm set ups and it cycled 100%. Then we took a factory piston set up and modified it to run on one of our DI Sig barrels. At first it would not fully eject or reset the trigger. We did some more work today and have it running on a Glock lower. We haven't run a lot of rounds through it so I'll see if I can get some reloading done and see how the piston set up holds up to the stress.
Also been doing more research on the 357 Sig and where it officially head spaces. We only have two choices (because I don't count the extractor....) and most responses say the Sig headspaces on the MOUTH.
However, according to the CIP which is the European version of SAAMI stated back in 2007 that the sig headspaces on the shoulder.
Then I started measuring ammo and am amazed at the variation we were seeing. A shout out to Remington as the clear winner on extreme spread and std dev on sizes. Far better than the Winchester, Fiocchi, and S&B I measured.
Then I asked for chamber and ammo prints and was further shocked at the clearances in these chambers. The explanation is that with defensive rounds, going bang is the #1 goal. If there are any questions, see Rule #1
Talking with shooters that use the Sig, the large qty shooters reload to their chambers and figure where they need to size to just bump the SHOULDER back. We are building a lot of DI sigs and have a new reamer coming to tighten up some clearances.
Back to lubrication. I have always felt that ANY lube is better than no lube. Where lube fails is if it is too light for the purpose and fails, or dries out after long term storage and gunks things up. As with anything, there are many opinions on lube type and use. I will tell you one thing: An AR runs much better when lubricated in the right spots, and that pretty much means anything that moves. Read a post last week about a product called Cherry Balm so I searched that out and have attached the link. It is a good read and form your own opinion.
www.arbuildjunkie.com/ar-15-lubrication-an-interview-with-cherrybalmz/
It does reinforce what I have always thought about sliding metal surfaces: use grease. The problem with the AR (in my opinion) is that grease attracts dirt. This is where some of the new coating technology comes into play. But after reading that article, I greased up one of our test uppers and it made a noticeable difference, so we are going to do some more testing. Again, with the AR putting 1000 deg hot gas into the BCG, a good lube is important and I've been using synthetic oils. We'll see how the greased pig holds up.
And, speaking of hot has in the BCG, which started this whole process.... We have two 357 Sig Piston set ups running. For those of you that have been around here for a while, we started by rechambering one of our Gen4 9mm set ups and it cycled 100%. Then we took a factory piston set up and modified it to run on one of our DI Sig barrels. At first it would not fully eject or reset the trigger. We did some more work today and have it running on a Glock lower. We haven't run a lot of rounds through it so I'll see if I can get some reloading done and see how the piston set up holds up to the stress.