Frequently Asked Questions

Below are the most frequently asked questions regarding GMB products and safe reloading practices. If you can't find the answer to your question here, please contact us via email.

Why roll-size?

Roll-sizing removes bulges from the base of cases and can repair damaged case rims. Yes, our case rollers also roll-size the case rims. Furthermore, it enhances the performance of automated reloading presses. Several of our customers have reported improved accuracy since they began roll-sizing their brass.

Should I clean the brass before roll-sizing?

Yes, it's advisable to clean your brass before roll-sizing as it helps prolong the lifetime of the steel parts.

Should I deprime the brass before roll-sizing?

You can, but it's not necessary.

Can I full length size cases before roll-sizing?

No, you should always roll-size them first.

Will it work with a Hornady / Mark7 case feeder?

Yes, we can provide adapters for the Hornady / Mark7 case feeders on request.

Is a case roller and rollsizer the same thing?

Yes, it's like 'flash drive' and 'USB drive.' Both terms are used interchangeably.

I want to buy GMB case roller Ultimate or HD and roll-size 9mm and 45 ACP. Which conversion kits and parts should I buy?

You need to buy:

• 1x GMB case roller L / Ultimate / HD conversion kit (Caliber: 9mm)
• 1x GMB case roller L / Ultimate / HD conversion kit (Caliber: .45 ACP)
• 1x GMB C-shaped wall for Ultimate / HD (Caliber: rimless (9mm, .45ACP, etc.))

I want to buy GMB case roller Ultimate or HD and roll-size 9mm and .357 Magnum. Which conversion kits and parts should I buy?

You need to buy:

• 1x GMB case roller L / Ultimate / HD conversion kit (Caliber: 9mm)
• 1x GMB case roller L / Ultimate / HD conversion kit (Caliber: .38 Special / .357 Magnum)
• 1x GMB C-shaped wall for Ultimate / HD (Caliber: rimless (9mm, .45ACP, etc.))
• 1x GMB C-shaped wall for Ultimate / HD (Caliber: .38 Special / .357 Magnum)