Well, doggone it Coogs! Would not have expected to see you on here. See you and read your posts on the Ruger Forums often. This is B1buddy - my login there. IHMSA Life member 11061
Haven't shot a match in some time, but not due to lack of desire. Retired and moved so that wife could be closer to her family and now the nearest big bore match is roughly 4.5 hour drive!!!! Anyway, long time IHMSA shooter, fan, match director, deputy Texas director, and on and on and on!
So, to the 7TCU question. Lots of good info already given to you and cannot object to any of it. My process and favorite loading is :
Currently have three sets of dies from three separate manufactures. Normally use the Redding dies.
As mentioned before, do your best to start with commercial brass. I ended up with a big batch of Federal, and it always seemed to last longer than any others. Example - in my old standing TC, I stopped counting the rounds after I put >6000 through the first barrel. During that time, I had approximately 300 rounds of brass that had over 26 reloads in them. But, like mentioned before, after the fire forming, neck size only, and keep the brass dedicated to an individual barrel.
When sizing the brass the first time - when I first started, I would lube good, and neck up and then deburr the necks. My normal loss was about 10% due to screwed up necks getting crinkled or crushed. I learned to do the inside and outside deburring BEFORE opening the necks up and my losses dropped to less than 1%. So, good idea here!!!!!
During all my time reloading the TC I shot either BLC2 or AA2460.( I shot TC in production and standing, and for awhile in an XP (but lost too many rams with it)). Another important point that I got from Elgin Gates reloading book was to set the seating depth to at least 40-60 thousandths off the lands. He was emphatic about doing that, and after a few quick tests, he was right. (PS note - If you are going to be in Tulsa this November, I will bring my Elgin reloading book for Silhouettes and you can borrow it for the weekend and read it, copy it, or whatever. Just let me know) Plus, we can visit about silhouettes too
I always stuck with 139 Hornady or 140 Sierra for the C,P, and T targets. Rams, were Hornady 154's in my standing TC and 162 Solid base Noslers for production. But, the solid base Noslers are pretty much unheard of any more. I have a few put away, but not nearly enough
Another note on bullets - Lots of testing in "the old days" with bullet construction etc. Pretty much confirmed that the flat base bullets are slightly more accurate on and average to the boat tail bullets, but naturally the boat tails are better at distance due to the higher BC. I would shoot flat base when available but really didn't make enough difference to me to warrant any rigid ruling. When shooting the shoot off targets are 200 meters, I would always shoot the C,P,T load. It didn't really seem to make much difference in the productions TC, but in the unlimited category it did. Usually, back then, the shoot off targets were somewhat smaller than the ones used for Production.
And, to give a little credibility to all this, I was International class in all Big Bore categories, State Champ a few times, and set two National records at the State NRA match (which have now been blown completely to heck and back

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Okay. I am tired of typing. Probably for sure forgot something that would be helpful, so feel free to ask me anything and I will try to help.
PS - I know you do the 357 Max. I still have my old Dan Wesson 357 VH8S and shot a few 40x40's with it. Never did try the Max in a TC on silhouettes but do have a barrel for it. I really, really liked the 170 grain silhouette bullets in the DW. I did try the Ruger Max for a short time, but got overwhelmed with the hype that was in The Silhouette about the DW's and switched. Probably would be a good one for revolver category. And, there are 357 Max loads in Elgin's book also. Plus, there is a book in my stash that is "shooting Steel", I think is its title. For the most part, it is a compilation of many of the articles from the organizations monthly news letter/magazine. Even has one of my letters to Elgin copied in it and I didn't even know he had done that until recently (or old man memory just forgot). Neat!!
Okay, Coogs! That's my story and I am sticking to it!!!
Buddy Bailey
IHMSA Life 11061