COVID – 19

Effects of the COVID-19 Virus on Our Operations

Like most people, we’re concerned about the spread of the Corona virus and its effect on friends and family as well as the economy. President Trump has taken appropriate measures to limit its spread, including requiring workers in non-essential jobs to remain at home.

As a supplier to both the Defense Industrial Base and firearm and ammunition manufacturers, Manson Reamers is considered “essential”, and continues its day-to-day operations in order to supply the firearms tooling you need.

We have a large inventory of standard items and continue to work on your special-order tooling as well. However, because some of our suppliers are considered “non-essential”, manufacturing times for special orders may lengthen if we’re unable to get some components required for your order. Please be patient and understand that we’re doing everything we can to complete your orders within the promised manufacturing time

As always, please contact us if you have further questions.

Dave Manson, President                                                                                                                        Manson Precision Reamers



Muzzle Centering Plugs, 350 Legend

February, 2020
It’s the New Year, SHOT has come and gone and we’re experiencing record order levels–for both standard and special tooling. Our staff is doing its best to fill them in reasonable time, and we ask for patience if your order is taking longer than you’d like. “Specials” are now taking 8-10 weeks from order acceptance to completion, and will likely require 12-14 weeks if placed in late March or April. If you’re planning on hunting with your project rifle in the Fall, NOW is the time to start.

The 2020 Catalog has been posted on our website. You’ll note that,  unfortunately, we’ve had to raise prices on a few items, due primarily to increases in the cost of materials or outside services.

Muzzle Centering Plugs                                                                                                         New for this year is our line-up of Muzzle Centering Plugs, listed on page 8 of the Catalog and shown in their “working location” on the Catalog cover.

These Plugs allow accurate centering of the bore at the muzzle without having to use a 4-jaw chuck. A Plug, fitted with the appropriate pilot bushing, is inserted in the muzzle of the barrel, which is then supported by a live center in the tailstock.  Accurate machining of the muzzle for brakes and suppressors is able to be done substantially faster than with traditional methods.

Muzzle Centering Plugs utilize our standard reamer pilot bushings (#1, 2, 3 and 4) for work with bores from 5.45 thru 50-cal. There are two Plug head sizes in each of the #1, 2 and 3 spindle sizes to ensure the Plug head will be smaller than the minor thread diameter being cut. There is only one head size with the #4 spindle.  Please contact us with any questions you may have about this new product.

350 Legend Reamers and Gauges
In spite of its slow initial acceptance by shooters, we’re seeing increased interest in the 350 Legend. This has allowed us to manufacture reamers and headspace gauges for this caliber in larger quantities, thereby reducing their price to our customers.

No longer priced as special-order items, roughing and finish reamers for 350 Legend are available from stock at $130.00 each (solid pilot), or $170.00 (removable pilot). Headspace gauges are priced at $40.00 each.

As always, please contact us if you have questions about any of the tools we make, or if we can assist you in the design of your personal project for this year.

SALE – New Manufacturing Overruns on Closeout

Please see our revised list for Manufacturing Overruns.  We have added many new tools  which may be useful to you.  Refer to the attached  list and place your order Noon to 5 PM EST. weekdays at 810-953-0732 or 0734. Alternatively, email us with your requests and provide complete payment information with billing and shipping address.  We will get the tools on their way to you promptly.  First Come, First Serve basis.

Manufacturer Overruns

We have also added many new items to our Writers’ Tool List.  Don’t forget to check the list of closed-out tooling for SAA Revolvers.

Writers Tools II

Tooling for SAA Revolvers Close Out

New Calibers Added to Standard Tools

“Manufacturers have introduced  quite a few new calibers in the past few years and we’ve made reamers and gauges for all of them at one time or another.  Some have grown in popularity to the point we decided to make them in quantity and available to our customers “off-the-shelf”.

Check out our “Additional Calibers” section (in the March 2018 Catalog under Products/Catalogs tab) for the new reamers and gauges available from stock: 6 MM XC, 6 MM Dasher, 224 Valkyrie and 6.5MM PRC.  Maybe your next build will be one of these.”

Cut A Test Throat With Your New Reamer

How do you know the throat cut by your new reamer is what you ordered? You don’t, unless you take the time to cut a “test throat”–something we strongly recommend.

We take pains to ensure the throat on your custom reamer is exactly as you ordered.  Rarely however, because of mis-communication or a mistake in the shop, the throat will be off sufficiently that it has to be re-cut, the barrel set back or even replaced.  This isn’t good for either of us as it wastes time and money.  The situation can be avoided by simply cutting a test throat (short chamber) and checking the fit of your dummy round to it before fitting the barrel and test firing.

The test throat can be cut in the barrel you intend to use on the rifle, or a barrel drop of the same caliber.  Run the reamer into the barrel (or drop) to the point the shoulder has been cut–but no further.  Make up a dummy round with just enough neck tension to keep the bullet from being easily pushed back into the case.  The bullet should protrude a bit further from the neck than where you plan to shoot it.

Insert the dummy round into the short chamber and push it forward so the shoulder of the case contacts the chamber shoulder.  Withdraw the dummy and compare the bullet’s location to where you want it to be.  If it’s within what you consider reasonable limits to where you’d planned, finish chambering your barrel.

If the bullet is not where you want it to be and its location is unacceptable, do not complete the chambering process and return the reamer to us for correction.

Because they apply to the suggestion to cut a short throat, our Warranty terms are re-printed below:

“Dave Manson Precision Reamers’ products are guaranteed against defects in material and workmanship.  If you feel one of our tools does not perform as it should, please call for suggestions as to its use.  We emphasize customer service above all else and strive to provide the best possible tooling.  If a tool is not right, it will be repaired or replaced, at our option. In all cases, our liability is limited to replacement of the defective tool.”

This simply means that we stand behind our products and will repair or replace them when indicated.  We will not, however, reimburse for a ruined component if a customer has not taken reasonable steps–as described above–to ensure that our tooling meets his requirements.

Custom Reamer Design

These days it seems that more and more shooters want to design their own, special-purpose chambers and are asking us to help in the process.  We’re happy to do this and have come up with guidelines as to how it can be done.  Further, we’ve created a form which, when completed, provides all necessary information to make the tooling you’ll need.

“Instructions for Reamer Design Worksheet” appears below—as well as in the “Tool Instructions” section of our web site.  When requesting a quote/ print on a custom reamer, please send a completed copy of the form to us so we can more efficiently respond to your request.

Instructions and Reamer Design Worksheet

E-Mail and Tracking Numbers

Over the past several years, the amount of time we spend answering e-mails and providing tracking numbers has increased way out of proportion to any increase in sales.

With tracking numbers, it seems that everyone wants to plot the progress of his order during shipment.  We have no way of sending these automatically, so it has to be done manually, which takes time that could better be used otherwise.

Because of this, we will no longer provide tracking numbers unless a package is lost—which was the original purpose of tracking numbers.

As far as e-mails go, 2 or 3 used to be sufficient to settle questions regarding an order.  Over the past several years, twice as many seem to be needed to cover all the bases, and the questions/e-mails are not nearly as well thought-out as in the past.  It’s almost as if the sender has a phone in his hand, sending individual questions as they occur to him.

We’re not Twitter and can deal with more than one question at a time.  So please think through your project and ask all questions in your first communication so we can answer them more efficiently. We know there will occasionally be follow-up questions and will gladly deal with those when they arise.

Ejector/Extractor Relief on Headspace Gauges

Customers are asking more frequently for headspace gauges with ejector and/or extractor relief cuts.  While we have made gauges with these features in the past, it’s been for large orders and specific customers who usually have to meet governmental requirements.

Our standard headspace gauges don’t have these features, and, in our opinion, don’t need them.  Read on to find out why we say this.  Comments below assume both extractor and ejector are working as designed.

Extractor Relief

Our gauges are made with full-circumference rims that are no larger or thicker than the rims of the cartridge you’re shooting.  If the cartridge rim will slip under the extractor, the rim of the gauge will also.  Having a full-diameter head, our gauges will locate against the bolt face more consistently than will gauges with one-third or one-half of the head cut away.

Ejector Relief

Plunger-type ejectors seem to be the concern because fixed ejectors within the receiver don’t contact the gauge head during headspacing.  The ejector plunger does contact the gauge head and must be compressed so the gauge head may seat squarely on the bolt face.  This is exactly what happens when the rim of the gauge is hooked under the extractor and pivoted to line up with and enter the chamber.

Once released by the gunsmith after entering the chamber, the gauge is pressed against the chamber wall by the ejector.  As the action is closed, the gauge centers up against the shoulder of the chamber, which forces the gauge straight within the chamber and the gauge head against the bolt face.  If there’s more than minimum headspace, the minimum gauge may remain slightly tipped—but you know you have at least minimum headspace.  If the action won’t close on the maximum gauge, the gauge will be straight within the chamber and flat against the bolt face—and you know headspace is less than maximum.

Hope this helps in your gunsmithing work. (For a printable format see Tool Instructions/Useful Information).