Reply to thread

Message

<blockquote data-quote="Greyfox" data-source="post: 897915" data-attributes="member: 10291"><p>I&#039;m not sure this explanation is right in terms of what you are referring to in the Nosler manual which I haven&#039;t seen, but I use water to evaluate the caacity differences between my brass cases, and loads.&nbsp; When I develop&nbsp; a load that I consider to be optimum, I will fill the prepared(trimmed and sized) case with the primer hole plugged, fill it completely with water, and weigh the case. I then subtract the empty case weight to get an exact capacity of the case.&nbsp; Since load performance can vary based on case capacity, this gives me a reference point should I change to a different lot, or brand of brass.&nbsp; It will also give an indication of case capacity differences between new, neck sized, or FL sized cases.&nbsp; This may be the difference the water capacity of the loads shown in the Nosler manual.&nbsp; Due to the component shortage I picked up some Norma 300WM to back up my supply of Winchester brand cases. The difference in case capacity between the two brands was 2.3gr, the Norma having greater capacity. Actual performance was different.&nbsp; The capacity between 260 Norma and Lapua brass was within .5gr, and performance was identical in terms of accuracy and velocity. This was an easy switch except for a having to use a smaller neck bushing with the Norma brass.</p></blockquote><p></p>

[QUOTE="Greyfox, post: 897915, member: 10291"] I'm not sure this explanation is right in terms of what you are referring to in the Nosler manual which I haven't seen, but I use water to evaluate the caacity differences between my brass cases, and loads. When I develop a load that I consider to be optimum, I will fill the prepared(trimmed and sized) case with the primer hole plugged, fill it completely with water, and weigh the case. I then subtract the empty case weight to get an exact capacity of the case. Since load performance can vary based on case capacity, this gives me a reference point should I change to a different lot, or brand of brass. It will also give an indication of case capacity differences between new, neck sized, or FL sized cases. This may be the difference the water capacity of the loads shown in the Nosler manual. Due to the component shortage I picked up some Norma 300WM to back up my supply of Winchester brand cases. The difference in case capacity between the two brands was 2.3gr, the Norma having greater capacity. Actual performance was different. The capacity between 260 Norma and Lapua brass was within .5gr, and performance was identical in terms of accuracy and velocity. This was an easy switch except for a having to use a smaller neck bushing with the Norma brass. [/QUOTE]

Verification