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#6250202 - 04/06/16 05:02 PM 308 guys. Trim length questions
Murphscout Offline
Pro Tracker

Registered: 10/25/08
Posts: 1493
Loc: Marble Falls, TX
Recommended trim length 2.005 Maximum 2.015 I understand that part. Is there any compelling reason (outside of just being anal like me) to trim all the way back to 2.005 if under 2.0015. Just got a box of lapua and they were mostly all 2.008-ish. I full length size everytime as not "expert" enough for bumping or neck sizing etc. Just wondering the implications of being over but under so to speak.

Thanks

Murph

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#6250258 - 04/06/16 06:06 PM Re: 308 guys. Trim length questions [Re: Murphscout]
Buzzsaw Offline
THF Trophy Hunter

Registered: 06/29/11
Posts: 5023
Loc: Frisco, Texas
Finally someone more anal than me.

Actually I thought the .308 had been discontinued cause it's not 6.5.......JK

LOad em!
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#6250339 - 04/06/16 06:55 PM Re: 308 guys. Trim length questions [Re: Murphscout]
603Country Online   content
Extreme Tracker

Registered: 07/03/12
Posts: 4862
Loc: Central Texas
You can still get 308? Who knew?

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#6250422 - 04/06/16 07:48 PM Re: 308 guys. Trim length questions [Re: Murphscout]
Teal28 Offline
Veteran Tracker

Registered: 12/10/08
Posts: 3349
Loc: Hen House Tx
Load and shoot. Worry about trimming once they get to max. up
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#6250444 - 04/06/16 08:09 PM Re: 308 guys. Trim length questions [Re: Murphscout]
jeffbird Offline


Registered: 03/09/09
Posts: 1709
No need to trim, but run them through the sizer to uniform the necks which can be out of round after shipping.

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#6250475 - 04/06/16 08:34 PM Re: 308 guys. Trim length questions [Re: jeffbird]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Originally Posted By: jeffbird
No need to trim, but run them through the sizer to uniform the necks which can be out of round after shipping.


Definitely.

Forget the books. You need .308" of bullet sitting in the neck. After the first firing, trim them wherever you want, provided they are not so long that they are causing a chambering issue, or not so short that you have less than .308" of bullet sitting in the case.
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#6250494 - 04/06/16 08:45 PM Re: 308 guys. Trim length questions [Re: Murphscout]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
I'll even let my cases go to 2.025", and they will still work and chamber just fine. When you do trim them, I trim to minimum, so I won't have to trim sooner.
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#6250512 - 04/06/16 08:58 PM Re: 308 guys. Trim length questions [Re: ChadTRG42]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2579
Originally Posted By: ChadTRG42
I'll even let my cases go to 2.025", and they will still work and chamber just fine. When you do trim them, I trim to minimum, so I won't have to trim sooner.


Theoretically wouldn't you get more case area to hold(for lack of a better word) the bullet with case length near maximum. For a lot of bullets prolly not needed, but some longer bullets it could help

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#6250517 - 04/06/16 09:00 PM Re: 308 guys. Trim length questions [Re: Murphscout]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
Essentially, yes. But .010" is not much. The main thing is keeping your cases all about the same length for consistency.
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#6250653 - 04/06/16 11:00 PM Re: 308 guys. Trim length questions [Re: Murphscout]
Murphscout Offline
Pro Tracker

Registered: 10/25/08
Posts: 1493
Loc: Marble Falls, TX
Thanks fellas. I made some assumptions that were all answered here. I appreciate it.

Maybe I'll graduate to creedmoor one day...maybe smile

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#6250884 - 04/07/16 08:52 AM Re: 308 guys. Trim length questions [Re: Murphscout]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
Nope! There's nothing wrong with a 308!! It's still my favorite caliber to shoot and plink with.
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#6251468 - 04/07/16 05:58 PM Re: 308 guys. Trim length questions [Re: Murphscout]
Kawabuggy Offline
Pro Tracker

Registered: 01/14/08
Posts: 1622
Loc: Houston, TX
One thing I've always wondered about is if a LONGER case neck might hold the bullet a little tighter, or longer after the powder starts to burn, generating more pressure?

For hunting, or plinking, I doubt it would ever make any difference. But for those match shooting at long distances, you have to wonder if they trim every single case to the exact same length to rule out one more variable.

In my mind, the longer the case neck, the better hold it will have on the bullet. Maybe it makes no difference at all, or maybe it does. Since a lot of people don't anneal their cases anyway, the difference between an annealed case, and a work hardened case, might amount to more variance in regards to bullet "hold" than .020" of variance in case length.

One wonders about these things.. If I had a chronograph I could test various case lengths to see if there was any indication apparent from the data gathered.
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#6251591 - 04/07/16 07:50 PM Re: 308 guys. Trim length questions [Re: Kawabuggy]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 6194
Loc: Wise Co.
Originally Posted By: Kawabuggy
One thing I've always wondered about is if a LONGER case neck might hold the bullet a little tighter, or longer after the powder starts to burn, generating more pressure?



It might, but I don't believe it would be significant even if you were able to nail it down that fine. I think the effect of it would be really small when compared to what happens when the bullet engages the lands.

I think variations in neck hardness would have a much larger negative impact on accuracy than cases with nicely annealed necks but of unequal case length.
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#6251633 - 04/07/16 08:18 PM Re: 308 guys. Trim length questions [Re: RiverRider]
kmon1 Offline
junior

Registered: 09/27/06
Posts: 20282
Loc: Texas
Originally Posted By: RiverRider
Originally Posted By: Kawabuggy
One thing I've always wondered about is if a LONGER case neck might hold the bullet a little tighter, or longer after the powder starts to burn, generating more pressure?



It might, but I don't believe it would be significant even if you were able to nail it down that fine. I think the effect of it would be really small when compared to what happens when the bullet engages the lands.

I think variations in neck hardness would have a much larger negative impact on accuracy than cases with nicely annealed necks but of unequal case length.


X2
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#6251969 - 04/08/16 08:15 AM Re: 308 guys. Trim length questions [Re: Murphscout]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9393
Loc: Lewisville, TX
The main issue I see with longer case necks (longer than spec) is the case mouth pushing up against the end of the chambering and essentially crimping the case mouth against the end of the chamber and squeezing the bullet too tight to release properly and causing a high pressure issue. But you will feel this when you close the bolt.
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