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users where to shoot android mobile app where to shoot iphone ios mobile app permalink articles news shooting skills post comment july 31st 2026 cool tools for measuring cartridge case shoulder bump the tactical rifle shooters facebook group recently showcased tools used to measure case headspace before and after bumping the shoulder after a case is fired hand loaders who full length size their cases will typically bump the shoulders back anywhere from 001 to 0035 depending on the rifle and application with our 6mmbr and dasher cases we like about 0015 bump you want the amount of case sizing and bump to be the same for all your brass to ensure uniformity it makes sense to measure your cases before and after the fl sizing process when we have time we check every case other folks will simply check the first 3 4 cases coming out of the fl sizing die to ensure the fl die setting is correct and delivering desired headspace bump whidden gunworks shoulder bump gauge there are a variety of tools that can be used to measure shoulder bump our favorite is a special cartridge specific bushing made by whidden gunworks this handy 24 00 whidden shoulder bump gauge enables you to adjust your sizing die to the desired measurement the bump gauge is attached to your calipers with a set screw and determines the measurement from the base to the shoulder of the case the photo below from tactical rifle shooters shows the whidden bump gauge for the 375 cheytac cartridge l e wilson case gage depth micrometer if you are looking for precise bump measurements without having to mess with calipers and clamp on gauge blocks you may want to consider the l e wilson case gage depth micrometer currently 140 00 this takes very precise repeatable measurements but you need to know your starting point the manufacturer explains every reloader should know exactly how much your full length sizing die is pushing back the shoulder with the new case gage depth micrometer you can do just that it has never been easier to measure you cases headspace before and after sizing the depth mic allows you to slip the micrometer perfectly over the top of the gage with your case inserted into the gage and take a measurement micrometer has graduations of 001 the case gage depth micrometer is set to a zero of 100 on the scale at our factory because of differences in feel and temperature we include a the gage block for you to test zero and to adjust if necessary dave manson vertical comparator with dial read out background image courtesy tactical rifle shooters inset photo from manson precision reamers dave manson states this tool was designed to make life easier for the advanced shooter and re loader by allowing precise measurement of ammunition case and chamber headspace with this information the re loader will be able to fine tune clearances and fits between his ammunition and chamber with resultant improvements in accuracy and case life the functions of the manson dial cartridge comparator are 1 measure headspace of factory or reloaded ammunition 2 quantify chamber headspace by measuring headspace of a fired case 3 ensure minimal shoulder set back when setting up re loading dies 4 compare base to ogive length to ensure consistent bullet to rifling relationship in addition to the dial indicator and stand the 180 00 dial cartridge comparator is supplied with multiple datum blocks of precise length and inside diameter 3300 3750 4000 4375 more info here hornady l n l headspace comparator system hornady s lock n load headspace comparator system is easy to use and handy you can get a kit with red bushing holder body and 5 bushings for 45 99 at midwayusa hornady explains the lock n loadâ headspace comparator gauge measures variations in brass before and after firing or re sizing it allows for headspace comparison between fire formed brass and re sized brass important hornady states to determine the proper bushing diameter for your cartridge simply add the neck diameter and the shoulder diameter and divide that number by two use the bushing closest to that number hornady offers seven 188 240 330 350 375 400 and 420 one tip we have found the hornady gauges may vary a little from unit to unit even with the same nominal size if you have more than one gauge for the same cartridge test each on your brass you may then note a slight difference in your bump measurements mark one and use that consistently there is also an anvil base kit that mounts to the opposite blade on the caliper this provides a more stable surface for the base of your case pistol brass case diy bump gauge last is a field expedient set up if you do not have any of the comparator tools shown above a sized 45 acp case or other suitable pistol case can be used to measure shoulder bump the mouth of the pistol case sits on the shoulder of your rifle cartridge brass make sure the 45 acp case is trimmed square and that it is round we recommend you first run it through an expander then size it trim it and chamfer next take the 45 acp case and slip it over the neck of a fired unsized rifle case with the primer removed align the two cases between the jaws of your calipers and note the length from rim to rim see left photo below ok now you have the length for a fired rifle case before sizing next take a full length sized rifle case without primer and do the same thing placing the 45 acp case over the neck of the fl sized case right photo the difference between the two numbers is the amount of â bumpâ or set back you are applying to the shoulder here the difference is 0015â ³ the amount of bump you need varies with your chamber and your load but 0015 002â ³ is a good initial setting permalink articles videos reloading post comment july 31st 2026 cartridge efficiency bullet speed and energy vs case volume efficient cartridges make excellent use of their available powder and case bore capacity they yield good ballistic performance with relatively little recoil and throat erosion cartridge efficiency a primer pun intended by usamu staff the u s army marksmanship unit usamu published a series of reloading articles on its facebook page in this article the usamu discusses cartridge case efficiency and its benefits while this is oriented primarily toward nra high power rifle and long range 1000 yard competition these factors also apply to medium big game hunters assuming oneâ s rifle and ammunition are accurate key considerations include ballistic performance i e resistance to wind effects plus trajectory recoil and throat erosion barrel life efficient cartridges make excellent use of their available powder and case bore capacity they yield good ballistic performance with relatively little recoil and throat erosion a classic example in the author s experience involved a featherweight 7x57mm hunting silhouette rifle when loaded to modern rifle pressures just 43 44 grains of powder pushed a 139gr bullet at 2900 fps from its 22 barrel recoil in this light rifle was mild it was very easy to shoot well and its performance was superb an acquaintance chose a do everything 7mm remington magnum for use on medium game at short ranges a larger heavier rifle it used 65 grains of powder to achieve 3200 fps with similar bullets from its 26 barrel recoil was higher and he was sensitive to it which hampered his shooting ability similarly efficient calibers include the 6mm br norma and others todayâ s highly efficient calibers such as 6mm br and a host of newer developments might use 28 30 grains of powder to launch a 105 107gr match bullet at speeds approaching the 243 winchester the 243 win needs 40 45 grain charges at the same velocity champion level long range shooters need every ballistic edge feasible they compete at a level where 1 more or less drift in a wind change could make the difference between winning and losing shooters recognized this early on the then new 300 h h magnum quickly supplanted the 30 06 at the wimbledon winnerâ s circle in the early days the 300 winchester magnum became popular but its 190 220gr bullets had their work cut out for them once the 6 5 284 and its streamlined 140 142gr bullets arrived on the scene the 6 5 284 gives superb accuracy and wind performance with about half the recoil of the big 30 magnums â albeit it is a known barrel burner currently the 7mm remington short action ultra magnum aka 7mm rsaum is giving stellar accuracy with cutting edge 180 grain bullets powder charges in the mid 50 grain range and velocities about 2800 fps in long barrels beyond pure efficiency the rsaum s modern â short and fatâ design helps ensure fine accuracy relative to older longer cartridge designs of similar performance recent design advances are yielding bullets with here to fore unheard of ballistic efficiency depending on the cartridge they can make or break ones decision ballistic coefficients bc a numerical expression of a bullet s ballistic efficiency are soaring to new heights and there are many exciting new avenues to explore the ideal choice involves a balancing act between bullet bcs case capacity velocity barrel life and recoil but as with new car decisions choosing can be half the fun factors to consider when evaluating cartridges for competitive shooters pristine accuracy and ballistic performance in the wind are critical flat trajectory benefits the hunter who may shoot at long unknown distances nowadays range finders help however this is of much less importance to competitors firing at known distances recoil is an issue particularly when one fires long strings during competition and or multiple strings in a day its effects are cumulative cartridges with medium heavy recoil can lead to shooter fatigue disturbance of the shooting position and lower scores for hunters who may only fire a few shots a year recoil that does not induce flinching during sight in practice and hunting is a deciding factor depending on their game and ranges etc they may accept more recoil than the high volume high power or long range competitor likewise throat erosion barrel life is important to competitive shooters who fire thousands of rounds in practice and matches vs the medium big game hunter a cartridge that performs well ballistically with great accuracy has long barrel life and low recoil is the competitive shooterâ s ideal for the hunter other factors may weigh more heavily cartridge efficiency and energy another perspective former lapua staffer kevin thomas explains that efficiency can be evaluated in terms of energy cartridge efficiency is pretty straight forward energy in vs energy out most modern single based propellants run around 178 215 ft lbs of energy per grain these figures give the energy potential that you re loading into the rifle the resulting kinetic energy transferred to the bullet will give you the efficiency of the round most cases operate at around 20 25 efficiency this is just another way to evaluate the potential of a given cartridge there s a big difference between this and simply looking at max velocities produced by various cartridges permalink articles bullets brass ammo reloading post comment july 30th 2026 for summer varmint adventures include a 17 hmr rifle planning a prairie dog hunting adventure this summer consider bringing a 17 hmr rimfire rifle of course for long shots you ll definitely want a centerfire we like the 20 practical in an ar and a 22 br bra in a bolt action that will have you covered out to 700 yards but for shorter shots on small critters say inside 150 yards it makes sense to have an accurate 17 hmr rimfire rig today s 17 hmrs are capable of surprising accuracy rivaling a good centerfire rig but with less recoil and much lower cost per shot and the 17 hmr offers more than double the velocity of a 22 lr up to 2650 fps with a 17 grain bullet top shot former champion dustin ellerman likes his volquartsens and we can see why with one of his favorite 17 hmr rimfire varmint rigs he s seen some outstanding accuracy with cci ammo a few seasons back on his facebook page dustin reported prepping for prairie dogs and i m floored by this cold sub half inch group shot with the volquartsen custom 17 hmr at 100 yards this thumbhole stock rifle features a bowers group uss suppressor and 3 12x56mm meopta scope dustin tried different types of cci 17 hmr ammo this small group was shot with cci a17 ammo what s the effective range of a 17 hmr on prairie dogs you might be surprised in 2015 dustin took another volquartsen 17 hmr on a prairie dog hunt in wyoming he was impressed with the rifle shown below and the little rimfire cartridge dustin says the effective range of the 17 hmr is farther than one might expect â i made hits out to 300 yards 200 yards was easy as long as the wind wasnâ t too bad â here s the volquartsen 17 hmr dustin used in wyoming in 2015 after that 2015 p dog expedition dustin became a fan of the 17 hmr cartridge â never paid it much attention before now because the ammo is five times more expensive than 22 lr and i mostly target shoot however for prairie dogs the 17 hmr is amazing â consider this â hornadyâ s 17 hmr ammo pushes a 17gr v max bullet at 2550 fps twice as fast as typical 22 lr rounds prairie dog adventure with savage a17 this video shows a successful prairie dog hunt watch and you ll see hits out to 160 yards 00 50 proving the effective range of the 17 hmr cartridge the host is shooting a savage a17 semi auto 17 hmr rifle in a boyds laminated stock things to know about 17 hmr ammunition bullet type weight the standard bullet weight for 17 hmr is 17 grains with options up to 20 grains for improved wind resistance and penetration polymer tipped bullets expand rapidly on impact while jacketed hollow points jhp offer deeper penetration which is more powerful 22 mag or 17 hmr while the 22 wmr magnum may offer slightly more raw energy 17 hmr delivers superior velocity and flatter trajectory giving it better accuracy at long distances for precision shooting 17 hmr generally has the edge how does 17 hmr ammo compare to other rimfire cartridges compared to 22 lr or 22 wmr 17 hmr shoots flatter faster typically 2500 fps and with greater accuracy at extended distances it s a top choice for rimfire shooters who demand high performance beyond 100 yards what is the effective range of 17 hmr good 17 hmr ammo is highly accurate up to 150â 200 yards for small game and varmints some experienced shooters can push it beyond 200 yards with the right optics and wind conditions what is the best barrel length for 17 hmr rifles a barrel length between 20â 22 inches is optimal for 17 hmr balancing velocity maneuverability and accuracy shorter barrels are lighter but may lose some velocity while longer barrels offer slightly better ballistics at the cost of weight is the 17 hmr good for beginners yes 17 hmr has low recoil flat trajectory and simple handling for new shooters it s an easy shooting round that offers good performance with low recoil these tips come from the helpful 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