Tile· 8. /; M. Vlslllle Powde, MetlsII,.Due to its unique construction, the B. & M.

Visible Powder Measur·e is by far the mostaccurate tool of its kind obtainable. Mostpowder measures of to-day have but one hop-per which feeds diredly into a mea;suringchamber, with the result that the height anddensity of the powder column in the hopperhave a direct influence on the weight of thepowder charge thrown. Thus a fuB hopp·erof powder throws a heavier charge than onea half or a third full. The B. & M. VisiblePowder Measure overcomes this fault becausethe main hopper is not connected to themeasuring chamber. The powder is fed fromthe main hopper into a secondary hopper orcharger reservoir and from thi'S into themeasuring chamber. The charger reservoir isdisconnected from the main hopper when itis connected to the measuring chamber. Thusthe height of the powder in the main hopper

The B.&M. Visible Powder Measure has absolutely no effect on the weight of thecharge thrown. This feature largely accounts

for the remarkable accuracy of the B. & M. Visible Powder Measure. Successivecharges thrown by it vary so slightly in weight that only by the most careful andtedious manipulation of a set of balances can the handloader obtain more uniformpowder charges. It is the most accurate powder measure available.

Note: For the benefit of those handlo.aders loading for the "Magnums" wehave developed a Charge Tube Assembly longer than stand.ard, wHh graduationsto 50. These will contain up to approximately 80 grains for the powders commonlyused in this caliber of firearm. Als·o used for measuring shot in sizes 6 and smallerfor hand gun shot loads. It is available on request at a slight extra charge.

MICROMETER CHARGE TUBE

We have recently developed a micrometer type 'of Charge Tube for the B. & M.Visible Powder Measure. These can be set to any given graduwtion exactly. Usingthis type, the handloader records the_ settings used with his favorite loads and.whenever he desires to duplicate them, the slide may be set exactly to perform thatfunction. They are also very conveniently set to points anywhere between theregular graduation numbers which appear on the slide. They are available in theregular and magnum sizes at a slight additLonal cost as shown on our latest price list.

They interchange with the regular type we have always supplied with the B. &M. Measure. If the owner of a B. & M. Measure purchased in the past wishes to addthe micrometer feature to it, he needs only order the Micrometer Charge Tube.

The B. & M. Visible Powder Measure is so remarkably accurate that the pur-chase of an expensive set of balance scales is unnecessary. It is safe, reliable .andconvenient.

Every handloader should own one of these precision instruments.Shipping weigh,t, 3 pounds, 8 ounces. ' ,

CHECKiNG THE SLIDE SETTINGSOF THE B. & M. ViSIBLE POWDER MEASURE

The accompanying table of "Slide Settings-B. & M. Visible Powder Measure"has. been carefully compiled and verified by testing with current lots of powders inus,e at the time of issue and will be found sufficiently accurate as a guide for mea-'suring powder charges for use in all low or medium p'ower loads. However owingto the fact that the specific gravity of different lots of the same kind of powdersvaries slightly--a conditiOn over which we have no control - the data containedherein cannot ·be guaranteed to be absolutely accurate. Of this feature, WallaceH. Coxe, Ballistic Engineer, of the E. I. DuPont de Nemours Company remarks.:

"There has always 'been a slight variation in the relation of the bulk to theweight of all types of propellent powders. With black s'Porting powders and the ob.,solete type of 'bulk for bulk' smokeless powdErs, this difference ratio w:;l:sless im-portant than it is today. .,- .. '.'

"Modern smokeless powders are designed To produce more uniform results andthis is better achieved by controlling the weight of charge rather than its bulk mea-surement. This practice has in turn reduced th8 variations that existed in bulkmeasurements but not entirely eliminated them. Hence, each Succe&sive lot of anyparticular kind of canister powder will perform as the previous lots when the sameapproximate Weights of charge are used. It is recommended, therefore, that aftera shooter has learned to throw consist0nt weights of charge with his powder mea-sure, he compares the actual weights of charge thrown at each setting of his powdermeasure. If he finds that the weighed charges do not check with the publi •.hed tableof approximate settings then he should make adjustments accordin~ly.

If the loader does not have an accurate ·balance 'of his own, the neighborhooddruggist may be willing to help~~im.

From the foregoing, it will :'be ROted that when the handloader desires to duoli-cate the ballistic properties .of It· load which he 'h.as developed and found satis.factoryusing a certain lot of a given kind at powder, it is advisable to check the s-lide settingof the B. & M. Visible Measure in ol:.der t·o obtain the same weight of charge whenpowder fro.m another lot is used. .

Note also, that when the loader is using a maximum or nearly maximum loadof a given lot of powder, it Illay not be safe to use this slide setting when a new lot18 to be us.ed. Dangerous pressures can result from this practice. Verify the weigh'tof charges thrown before loading high power loads from a new lot o·fpowder. Oncethe correct setting is obtained, it will not be foUpd necessary to check the weightof succeeding charges from that lot when the B.&M. Visible Powder Measure is used.

The Tool is designed to be clamped by means of a thumb screw to a shelf orwork bench. The upper reservoir or main hopper may now be filled with powderto any desired height. As the main hopper is filled the powder runs down andnearly fills the charger reservoir which is equipped wHh a glass front through whichthe powder is clearly visible. The charge tube or measuring chamber is graduatedin numbers from one to thirty-five and is easily adjusted by means of a thumbscrew. The table on the next page is a table which lists all the powders availableto the handloader and shows the weight in grains of the charge thrown by lhemeasure for each kind of powder when the charge tube is. set at any given gradua-tion. Setting the charge tube at the proper graduation to throw a given chargeof a certain powder requires but a few seconds. Measuring powder with the B. &M. Visible Powder Measure is ellually simple. After the main powder hopper is filledand the charge tube ,properly set the .latter is inserted in the measure as far as itwill go and held in place as shown in the illustration. The lever handle is now firm-ly pushed to the right a full stroke, held there until the charge tube is filled, andthen returned in a similar manner to its original position. The powder runssmoothly and evenly from the charger reservoir into the charge tube. The B.& M. Measure does not require and should not be pounded or hammered. Thecontents of the charge tube may now be funneled into a primed cartridge case.When the lever handle was moved forward the· charger reservoir was first com-pletely disconne·cted from the main hopper and then connected to the passageleading to the charge tube. The return stroke of the lever disconnected the charg-er reservoir from the charge tube and as the stroke was completed again connect-ed the charger reservoir with the main hopp·er. Thus there is always a constantamount of powder in the charger reservo·ir when it is connected to the charg'e tubeand the density of the powder column is the same for each successive charge.The glass front of the charger reservoir permits the operator actualIy to see thepowder run into the charge tube, and if the charger reservoir does not refill whenthe lever is returned to its original position warns him that the main hopper isempty. When the charge tube is removed after the completion of. the full strokeof the lever, the operator really sees th'e full and accurate charge before it if'funneled into the cartridge case.

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