RL15 is a good choice. Some talk about temperature issues but as long as you are staying away from maximum loads, it will serve you well.
I really struggled to get the RMR 69 3GH to shoot well for me, and I tried it in 3 different rifles. The 75 3GH seems to shoot much better.
Hornady...
A good friend had one of those years ago. They are a nice rifle and 222 is a great cartridge. He now has a custom 222 built by Dan Dowling that is one of the most accurate guns I have ever shot.
The 722 is most likely a 14 twist. You may get away with a 55 grain bullet, but most are shooting...
How do you know it wasn't the bullet?
Recently, I was shooting some 77 SMK blems, and had three 5-shot groups where four shots would touch and one would be 1/2 inch outside.
The groups were all sub MOA so I was happy with that. I need to do another test with non-blems to make sure it was me...
It has been a while since I have loaded 45LC so I pulled these from my database. The first two are warm loads, shot from a Ruger Blackhawk using Starline brass.
230gr Winchester HP, 9.5gr Unique
200gr Plated FP, 9.5gr Unique
250gr LRNFB 4.2gr Hodgdon Clays
230gr LRN 7.5gr Hodgdon Universal
I have been very happy with my CZ 457 MTR and Bergara B14R. The B14R feels a lot like the real thing, and is based on the Remington 700 which allows you to use the same stocks, triggers, scope mounts, etc.
The first thing I would try is a different magazine. I like the Chip McCormick Classic series.
https://www.brownells.com/gun-parts/magazines/handgun-magazines-parts/1911-classic-magazine-45acp-7rd/
Sometimes a 1911 will need a little tuning to get them running right. Could be a bad magazine, low quality springs, or an extractor that could use a little adjustment.
Neck tension is a thing but turning will not take 0.5" groupings and reduce them to 0.1"
My experience with reloading is that bullet quality, annealing, and using a mandrel have yielded the results I need.
My guess would be cost because of the economy of scale. In the broad picture, the reloading industry is small, and then divide that again by how many would purchase an electronic scale. It's pretty small.
Not a lot of reloaders would pay $500 for a scale, so the reloading scale manufactures...
Anything extra can always be used for trading during a shortage.
That said, I probably have more powder than primers to light it all off so I need to fix that one of these days.
Vihtavouri shows 2021FPS using 26.2 N150 behind a 130 Barnes 130 TSX.
That's a monolithic bullet but you may be able to get similar results with a traditional bullet.
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