.25 wsm
- Thread starter countryboy223
- Start date
stazmania
Well-Known Member
Great post. I have a couple of questions. Does the get thicker, if so how much? in the neck wall after necking down? Does the brass grow in length after sizing? If you fire form the brass before turning the necks is there any difference in the performance of the turned and unturned? Would you share your reamer specs? Thanks Staz
That should show quickly if going up or down is more advantageous. Both seem to work. I'm shooting straight 300 WSM this year. Are you using Magnum primers with 70 grains of Retumbo? 300 WSM is an odd case, it straddles the infamous 60 grain point.
That's something that got me pondering, the twist rate. I have standard 1:10 on my 300 WSM, and it seems that to really take advantage of the case, one needs to take it down to 1:7.5 or 1:8.
What twist on the 6.5 WSM?
82nd Bill
Well-Known Member
The necks are not identical to each other after sizing down, not by much but still happens. The Peterson necks grow about 1 to 1.5 K which can cause a tight fit in the chamber neck area and poor bullet release. I fire form them before doing any trim work as I have found that trimming first causes additional differences because the brass has not moved enough until it is fired. My the way I never seat a bullet with the shank below or at the shoulder neck junction.
The necks need to turned or there may not be enough tolerance in the chamber and may cause a pressure spike due to a slow bullet release from an overly tight neck That issue alone means they must be turned. In this case they are turned to 14k and the neck donut from resizing is removed.
the first firing gives me barrel break-in, rough scope zero, find max powder charge, rough seating, and NT. None of it is great info but provides a good starting point for a ladder and the next firing.
After the first firing the cases get neck turned and case length trimmed, I generally do not need to turn or trim them for another 8 to 10 firings.
As to the reamer you need to contact preferred Barrels for that info.
Keep in mind I am running a fairly mild load in mine and is about 3g off max charge and there is a lot of V on the table. Higher charge weights are going to change some of the above notes due to the higher pressures. Things like number of firings before trimming, maybe fire forming on the first firing, case life, donut issues etc.
82nd Bill
Well-Known Member
If you mean on the 25 WSM i would say yes but check out the bullet stabilization on Bergers free chart. I tied 85, g Ballistic tips and blew several into grey dust at the 7.5 I am running so be sure to check it on the Berger app on their website. My Hammers like it fast.
Last edited:
They will stay together at 3950 in a 9tw, if that's helpful.
82nd Bill
Well-Known Member
One more thing to be caution with is the seating depth. I you have a short action that has a standard-length mag box you may have to seating according to what can fit into the mag and still feed. Mine is a short action with an extended mag box, by Wyatt outdoors and it gives me 100k more capacitary to load longer rounds.
82nd Bill
Well-Known Member
Phil
I totally agree.
stazmania
Well-Known Member
Thanks for all the great info. I will use a mod 70 extreme weather 6.8 western or a classic 270 WSM. Mag boxes are same as Wyatt's extended. SAC makes 6.8 die and is available with 25 cal option. If I use the 6.8 brass I may neck down to .243 and use sierra 116 tmk or new berger 120.
