Relationship Between H 4350 and IMR 4350
- Thread starter c-fbmi
- Start date
Don't worry Ron AKA is at http://forum.accurateshooter.com/threads/headspace-comparitor-bumping.3914000/page-4 and getting jumped on by pete1955
and just repeating what he read here or other forums trying to impress the young and innocent.P.S. Do not read any of the F. Guffey postings or you will go mad.
There was a slew of Australians in the Gunboards Enfield forum and they were a great bunch with a wild sense of humor.
Unfortunately gun laws were passed in Oz banning all semi-autos and with every firearm being registered with the local police.
And even stranger was the person in the UK (Marmite) who I got so many British military manuals from, that he copied from the MOD Pattern Room Library.
He had nothing but deactivated firearms and had never shot a firearm in his life.
Mystic Precision
CGN Ultra frequent flyer
- Location
- Summerland, BC
Been something I noticed when in my early years, I would study all the manuals I could get my hands on. No shortage of confusing situations as you described.
Then the new Lee Precision reloading manual came out and I came up with a SWAG.
I believe some data is simply copied from past tests and reused in newer manuals. Popular cartridges will likely get retested with current manf components but since components vary over time, you can see charge levels using the "same" powder that doesn't make any sense.
And it seems that the data can even be mixed between new and old data within a certain cartridge. ie... they list brand X powder but may not have actually tested those powders in their rigs. Simple cut and paste data from another test.
I have pretty much stayed with H powders so find the Hodgdon powder site to be current enough for me to get a useable start load.
Good enough for me.
Jerry
P.S. Do not read any of the F. Guffey postings or you will go mad.
He's been stirring some stuff on reloader's nest too....
Mystic Precision
Have you ever used the pressure trace system using strain gauges. It is my understanding that a test cartridge of a known pressure is used to calibrate the unit. And its still only a guesstimate compared to actual transducer reading. Your thoughts please.
I always liked the Lyman manual because it was a mix of strain gauges and universal receiver with pressure test barrels cut to minimum SAAMI dimensions for the chamber and bore.
Have you ever used the pressure trace system using strain gauges. It is my understanding that a test cartridge of a known pressure is used to calibrate the unit. And its still only a guesstimate compared to actual transducer reading. Your thoughts please.
I always liked the Lyman manual because it was a mix of strain gauges and universal receiver with pressure test barrels cut to minimum SAAMI dimensions for the chamber and bore.
You will go blind if you read F.Guffeys postings and you were linked to accurateshooter.com to read Ron AKA postings. His last post was deleted here and he hasn't posted a word here since.
Well one thing is certain, I'm glad you post here and I really enjoy all your diagrams and pictures.
Wife and I had a tour once through the Jack Daniels distillery in Lynchburg, Tennessee. It was very interesting and a real typical southern historic town and area, loaded with civil war battle sites and white crosses.
Over 95% of the images and photos are gone, I got fed up with most of the reloading forums and cleaned out my photobucket account and stopped posting for a few months. During that time I flew RC Quad-copters and helicopters inside the house but my wife got mad at me for chasing the cats and crashing into walls. I decided to come back to GunNutz and ran right into sunray II.
When I came back here and Ron AKA told me I just did not understand and that he was a Engineer and has been reload for over 50 years. I immediately thought of biological mix of sunray and F.Guffey and thought of putting a bullet in my computer. Luckily I remembered I could Google Ron AKA and track him down and found him at accurateshooter.com.
Below is from accurateshooter.com reloading forum.
[QUOTE="RonAKA,
I think one of the issues in reloading that is not fully understood is that the distance from the base level in the shell holder to the face of the shell holder is critical. I think there is a supposed standard dimension of 0.125". However two I have (Lyman, and no name, Lee?) measure closer to 0.123". They have 0.002 more bump potential built in than a so called standard. Then there is the die issue. Is it made for a 0.125 or a 0.123" or what? RCBS according to their product description claim they size the body of a case to minimum SAAMI, but the shoulder to maximum SAAMI. If you combine a RCBS die built like that, with a fat shell holder, you may not be be able to bump to even maximum SAAMI.
Bottom line is that after the gun is bought or built, a reloader needs a method to measure the SPACE that a sized cartridge has at the shoulder, regardless of what you want to call it. And you need a shell holder that is skinny enough to get the shoulder bump done..[/QUOTE]
[QUOTE="pete1955,
And at the canadiangunnutz.com you told the OP who was having problems bumping his shoulder back far enough to buy Redding competition shell holders. So with all your worldly expertise how will the OP push the case further into the die using competition shell holders.
Headspace is also the distance between your ears and how well you use that space.
Sorry to this forum but Ron AKA is our Canadian version of F. Guffey![/QUOTE]
Fun fact. The JD Distillery is in a dry county. lol
Yep! But they took us around the big vats where they brewed the mash, on a walkway where the top of the vat was a little above waist high and we could bend over and put a finger in the mash, then suck it off the finger!
It helps to have two dyslexic typing fingers, the images kept my two fingers from becoming exhausted.
