243 case length

[hot dog]

Hi chaps, anyone who reloads a 243. ?? Has anyone tried trimming cases to a longer length ie 2.0380/2.0385 instead of standard 2.035??
If so what were the results.

 

[Scuffy]

I’ve had them longer than that Prior to trimming with no detrimental effects,

 

[Muir]

Could be rather dangerous risking impingement. No matter what length you chose, trim them all the same -Muir

 

[hot dog]

Could be rather dangerous risking impingement. No matter what length you chose, trim them all the same -Muir

Thank you. I've settled on 2.038 to try a batch of 5

 

[Muir]

Whats to try? Do you expect some change? -Muir

 

[jb1]

Find it hard to trim longer, but as long as they are are all less than max length and as Muir states all as near as dam it identical length.

 

[hot dog]

I need a few extra thou to seat my nosler BTs as I've reduced the jump to 0.018 instead of .025

 

[Jo308]

In my .243 safe max is 2.037, so when cases reach this length I trim them back to 2.033". DO NOT try to load and fire a round when the case length is making the bolt difficult to close!
In my opinion there is no significance to cases being a few thou shorter than the SAAMI spec of 2.035" - it is not going to make a big difference to accuracy. But if you trim them very short, obviously the case to bullet tension/friction is reduced or you will not be holding the bullet stable which is not a good idea. The important thing is to check case length after re-sizing and when you need to trim again, make them all the same!

 

[hot dog]

Thank you for your info. My cases have been trimmed to + or - .0005"
With full length resizing based on a few tight cases to adjusting the die as recommended by Reeding so that the bolt closes easily.
The Nosler BTips have a very shallow case seat compared to the Hornady
The Noslers give me a far better group than the Hornady on the bench rest. Hence the reason for wanting a longer case.Sub moa to + 1.5 moa @ 100
Any thought?