Reloadind 7mm SAUM

[jim meyer]

I am new to this site and to reloading. I have two questions that I am concerned about. I have the Nosler reloading guide 5 edition.
The first question i have is about the overal lengh (proper bullet seating) of the bullet. the book shows the maximum cartridge length of 2.825, when i determining the proper seating depth as instructed in the book on page 42, i get a mesurment of 3.012.
The second one is about the primer. the book tells to use the REM 9.5M on the Nosler web site says to use the REM 9.5. (no M) What is the difference in these to primers?
I am planing to load the 140gr AccuBond with H414 powder Thanks for the help.

 

[DrMike]

Jim

Welcome to the site. I believe you will enjoy hand loading immensely. The 7 SAUM is a sweet cartridge. With good handloads, this cartridge will handle 95% of the hunting you'll ever encounter in North America. Some cartridges (e.g. Weatherbys, 350 RM, etc.) have a large jump to the lands, and thus to load to the lands requires what seems to be exaggerated lengths.

The OAL listed in a reloading guide is the standard established when a cartridge is standarised. It is the SAAMI standard. Rifle chambers vary so that the OAL for your rifle may (likely will) differ from the established standard. Thus, you are encouraged to measure your handloads so that they fit your chamber. You likely are shooting a Remington, and the magazines on most Remington rifles will be the limiting factor despite a chamber that would allow for a longer cartridge.

The Remington 9.5 M is a magnum primer, and thus somewhat hotter than the 9.5. Everything else being equal, magnum primers will generate a longer, more intense flame. It is a good rule of thumb to use the coolest primer that will still ignite your powder column in a reliable fashion. Since the powder column on the short magnums (WSMs and SAUMs) is shorter, many ballisticians recommend using standard rifle primers. Other, equally competent ballisticians, recommend that because the powder charge exceeds 60 grains, handloaders should use magnum primers. Magnum primers will generate somewhat more pressure, but they will ensure ignition of the powder charge in very cold weather or when ball powders have been used. My preference in loading for short magnum cartridges is to use regular rifle primers, despite using spherical powders and hunting in cold weather on many occasions. It likely is not critical whether you use magnum or regular primers, but it is important that you work your load up carefully, ensuring that it is safe in your rifle.

Best of luck in your handloading. Don't hesitate to ask any other questions you have. There are some great fellows on this site that will be pleased to share with you the wealth of knowledge acquired through years of handloading.