The rollsizing process removes the bulge in the base of a fired case to bring the case back a Mid SAAMI dimension. When combined with the normal sizing dies the case will be very close to the SAAMI specifications. This means you can now get Factory grade reloads with a standard reloading press. Reliability and consistency wins matches

The full length sizing die cannot reach the bulged base of fired case. When the cases are rollsized and then reloaded as normal, the round will feed and chamber reliably. The amount of blow out in a case depends mainly on the chamber in which the case was fired, the powder charge and recoil system used. The most common cause is when cases have been used in carry or LE firearms with unsupported or looser chambers due to the prerequisite of reliability over accuracy. The brass from these guns can often be re-used but without rollsizing the loaded round will not reliably feed or chamber in your firearm, escpecially if it is a tighter competition / target application.

Very hard to say, generally much longer than without rollsizing, but too many issues contribute so it is too hard to state exactly. The designer of the rollsizers gets over 40 reloads with rollsizing with regular starline / federal / winchester brass. There is no evidence of fatigue in the brass with rollsizing from any of the customers who reuse their brass.

Yes, all rollsizing processes require cases to be resized after evry firing. Failure to rollsize after each use will inclrease the likleyhood of feeding and case reliability.The resizing process is usually part of the reloading process so no additional effort is required.

Reliability, with rollsizing your ammunition will duplicate factory ammunition in size / shape with much greater reliability. The reality is, new brass is too espensive to buy and leave on the ground now. The purchase of "once fired brass" is becoming an urban myth and is very hard to guarantee and does not guarntee a quality reload anyway.

Rollsizing brass allows fired brass to be reloaded back to a new "Factory" standard. 

The Factory ammunition is sized and dimensioned to a range mid-way in the SAAMI Specification. This dimension CANNOT be achieved with standard or undersize dies. When rollsizing is combined with standard sizing dies, a consistent and reliable reloaded round is the result. 

Rollsizing will bring all the cases back to a consistent, reliable shape for reloading, your feeding and reliability issues will improve significantly, your accuracy and grouping will also improve. Rollsizing the case shape will remove the majority of the “coke bottle effect” noticeable in the 9mm and 40S&W cases. This is critical for competitive shooters and commercial reloading operations who cannot afford to use poor quality ammunition.

The rollsizer was designed by a qualified mechanical engineer and early examples of the rollsizer have now processed well in excess of 50 million+ cases. The base assembly and roller disc are made from high quality heat treated steel and should last a very, very long time. the rollsizer has been designed to operate with clean cases only (wet cleaning is preferred / recomended), wear from processing dirty cases is not covered by warranty. Replacement parts are available upon request.

The commercial rollsizer weighs approximately 60Lbs (27kgs), the DC Rollsizer weighs around 10kg (22lbs) and the manual rollsizer weighs around 3.5kg (7.7lbs). The rollsizer motors and gearboxes are supplied with very high specifications to offer an extremely long life. most rollsizers do not need to be bolted down. In most situations the casefeeder is noisier than the rollsizer operation.

The Manual rollsizer will need to be screwed don onto your bench, the DC and Commercial rollsizers can be placed on the bench next to your press or under it. All rollsizers are supplied with a long feed tube as standard (to suit Dillon Casefeeders) which is cut to suit your installation. The tube will allow you to divert cases from your casefeeder to the rollsizer and the rollsizer has a discharge tube to direct cases into a drum or other container.
A look through Youtube of FaceBook will show lots of examples of customer installations.

The Commercial rollsizer will process up to 6,400 cases per hour (60hz motors) and 5,500 ( 50hz motors) subject to the casefeeder keeping up. The DC Rollsizer will process between 1,500 and 1,600 cases /hr. The manual is limited by your hand speed or your drill but expect 1,500 to 2,000 cases per hr.

Yes, the rollsizers will process most pistol and rifle cases up a 308Win (7.62×51 Nato) case. The Rollsizer conversions have been made for 9mm, 38S&W, 38Super/38SC, 38Special/ 357mag, 40 S&W, 45ACP, 44mag, 308Win and 223/ 5.56Nato.

Other calibres are being released regularly as required.  Calibre conversions are simple, unscrew the centre disc retaining bolt and install the new calibre specific disc, adjust the casefeeder height (in some situations the feed tube to the case pusher needs to change) and you are good to go.

Please order via the ‘Buy a new rollsizer‘ and ‘Buy parts for your rollsizer‘ links in the menu. The rollsizer and needed items will be added to the cart with a shipping fee, you can then proceed to checkout and pay online and your order will be placed. You can also send us an enquiry via the “Contact” page.

Ammunition is made to a specification known as the SAAMI Specifications (Sporting Arms and Ammunition Manufacturers Institute). This is the rulebook covering ammunition and corresponding chamber dimensions for all ammunition manufacture, and all the major OEM manufacturers follow this. The Factory ammunition is rarely (if ever) loaded to the maximum size, the industry stndard is about mid way between the maximum and minimum dimensions but the vast majority of online dimensions  only show the Maximum dimensions. The Factory dimensions are generally pseaking the most consistent and reliable. Too large and the ammunition does not feed / go into battery. Too small and the magazines do no work and the ammunition does not seal within the chamber. Its all about manufacturing tolerances. 

This becomes even more important for those wanting to use reloads for competition or accuracy based sports (target shooting, mettalic Shilouette or IPSC / USPSA etc). Guns used in these applications usually have tighter tolerances especially in chamber dimensions and treloads in these applications are very difficult / impossible to reliably acheive without rollsizing. 

Commercial rollsizers will be provided  for the US / Canadian market will be supplied in 110VAC. 220VAC motors are available in the USA as special order and will be supplied without a plug (bare lead). The European / Australian orders and most other countries the motors will be either 220, 230 or 240VAC single phase. All commercial rollsizer motors are supplied with industrial specifications and rated to 50hz (which can run on 60hz as well).

The DC rollsizer and Decapper can operate / run continously and are supplied with a universal AC / DC power supply which can accomodate 90VAC up to 305VAC with no compromise to operational performance.


The machines are supplied with a 12 month repair or replacement warranty for the major components (motor, gearbox, rolling discs and case push assembly). The major components are conservatively sized and the working components are heat treated and  should last many years service free, if for some reason something breaks we can replace it but we will require a return to a depot / freight facility (based in the US for US buyers).

The rollsizer is not covered by wear due to processing dirty or poorly cleaned cases.

Some spares / consumables are supplied with the machines and include retention springs, activation levers and case push return springs. The activation levers are designed to eventually break if the case push stops moving (i.e. an oversize 40S&W case is dropped in the rollsizer while you are rolling 9mm).