My scenario, I have a real good load for a 270 win with 130ttsx's using new winchester brass that I just cleaned up the mouth and neck sized before loading. I tried a few once fired today with the same load, some I full length sized and some I just neck sized. The neck sized cases produced close to the same poi as the new brass loads but opened up a bit. The full length sized loads opened up substantially more. What direction does a guy go from here as far as resizing?
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New cases to once fired and sized cases
- Thread starter jerrya
- Start date
- Location
- Western Manitoba
The information in your post comes across as an "impression" that you have formed, rather than based on sound numbers. For example, are you comparing the average of say, four times 5 round groups, before versus after, or just from a few shots? You said that you loaded "a few" and get different results. That is not actually a very sound way to establish much of anything?
Other than to run in the expander ball to "round out" new brass, and to chamfer the case months, why are you re-sizing new brass at all?
Other than to run in the expander ball to "round out" new brass, and to chamfer the case months, why are you re-sizing new brass at all?
The information in your post comes across as an "impression" that you have formed, rather than based on sound numbers. For example, are you comparing the average of say, four times 5 round groups, before versus after, or just from a few shots? You said that you loaded "a few" and get different results. That is not actually a very sound way to establish much of anything?
Other than to run in the expander ball to "round out" new brass, and to chamfer the case months, why are you re-sizing new brass at all?
You are right, I formed my opinion on just a few shots regarding the resized brass. Probably a mistake on my end and will be trying again. The good load I have found after many rounds was using new brass, all I did was neck size it be because I know my collet die gives me .002" neck tension consistently and being winchester brass the mouth of more than half are slightly dented or misformed. Followed by chamfering. I only resized the once fired brass, some neck and some full length.
- Location
- Western Manitoba
"Conventional wisdom" would say that the once fired, fire-formed to your chamber brass, with uniform neck tension, would get "better" results, than raw unfired brass. If I were you I would look for run-out issues? In my experience, new necks are pretty straight, fired cases right out of the chamber are pretty straight, if your chamber is, so perhaps something in your sizing or seating sequence is creating excessive runout? Even just rolling the case on a flat surface, like a mirror, can show runout - case mouth wobbling, bullet tip wobbling. Don't really need to spend big money on a new gizmo, at least until some evidence that there truly is a problem in the first place. As per a post I recently read on this site, checking for runout, is not so much to come up with cases to "fix", as it is to identify where your re-loading process can be improved to not create it in the first place. Also possible, I suppose, that your neck in the chamber of your rifle is crooked - new brass is straight and shoots well; fire formed brass now crooked - will not know unless you check it.
