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Not enough speed and too little feed pressure. You work hardened the hole bottom. Use the .155 carbide drill at max speed and high feed pressure. Oil is optional. Next time get some 303 or 410 SS and you won't have a problem. RWO

On size end mills for slotting have to be 2-flute. A 4-flute will flex and make an oversize slot every time unless the material is very soft. This is less of a problem with a short carbide end mill, but HSS is bad about it. Even if you use a 2-flute, the climb cutting side of the slot will be...

This one might work: https://www.mcmaster.com/9637k77 If not go to the spring section of the McMaster catalog: https://www.mcmaster.com/springs and plug your specs into the search bars on the left. They sell to anyone and have no minimum order. RWO

Indeed, Redman's will reline the barrel for you if you like: http://redmansrifling.com/gun-barrel-relining/ RWO

Very strange. I looked at MSDS for 5 different common brands of mineral spirits on line and none contained acetone. How about a URL? RWO

This is news to me. What is your source? RWO

http://www.benchrestbulletin.net/drupal/node/2645 https://www.killoughshootingsports.com/index.php/tuners/harrel-style-muzzle-tuners-blk.html http://bulletin.accurateshooter.com/2013/01/centerfire-br-shooters-explore-benefits-of-tuners/...

FWIW a .473 Savage bolt head will extract a PPC case if a slightly longer extractor is made up. Maybe a Shilen head will work the same way. RWO

Scroll down to post # 22 here: https://forum.snipershide.com/threads/shilen-dgr-actions.217137/ RWO

I read somewhere that a Savage head will not fit a Shilen bolt. Sorry I have no idea where I read it. RWO

The Rem bolt head as designed will obturate and seal off in the barrel counterbore under high overpressure conditions. The factory counterbore is only .010" larger than the bolt head. Remington tested this obturating head and it was shown that it would protect the balance of the action from...

The left extractor is beveled to allow the case rim to be pushed forward by the ejector and then pivot on the right extractor hook and out of the action port to the right. The ejector is a fixed vertical blade that runs in a groove in the bolt bottom. Dual extractors are common on bolt, pump...

There is not much to it. See https://www.gunpartscorp.com/gun-manufacturer/remington/rifles-rem/521t https://leeroysramblings.com/Gun%20parts%20illustrations/Rem_511_illustrated.htm There is a better exploded view on the net somewhere, but I can't remember where. The barrel is held in by a...

Rem 700 receivers are made from an alloy very close to 4140 and hardened to about RC38. You can google welding on that material and find plenty of advice from pros on the welding forums. RWO

This book contains dwgs. and operating characteristics of a number of 3-lever conversions of the Walker trigger: https://www.amazon.com/Benchrest-Actions-Triggers-Stuart-Otteson/dp/0935632123/ref=sr_1_7?s=books&ie=UTF8&qid=1546363772&sr=1-7&keywords=otteson RWO

Make a hardwood dowel that fits the bore snugly and drive it in to cover the heat-affected zone plus about 3" either side. Solder the lug and drive the remains of the dowel out. You might need a bore brush to get all the wood combustion products out, but there should be no problem. RWO

Your question was answered many years ago: http://daytraco.com/Products/Speed-Lock-Kit-M93-96-Mauser__DSL93.aspx RWO

Remove it from the action and soak it in lacquer thinner, acetone, or MEK until it frees up. Flush with fresh solvent and blow dry with air. If it needs any lube at all, use small amount of Breakfree CLP. If this doesn't fix it then disassembly is the only answer. RWO

Belt drive with 3-phase motor. Get a aftermarket VFD ( single-phase input) to match ( $300 or less) This gives you wide range fingertip speed control with a quiet, smooth spindle drive and probably cheaper than a gear head. Increase in usability and convenience over any other drive cannot...

QC tool posts are nice, just don't go cheap. Aloris and Dorian are the top US made choices. Of the imports, Phase II ( wedge) is well thought of in the hobbyist community. Most of my tool holders are Phase II and I use them on a Dorian post. They are properly hardened, cleanly machined and...