6.5 saum?

[lwing]

Hi there, does anyone prep 7saum brass down with Whiddon dies? Wondering your procedure and if your happy with it. Whiddon recommends non bushing, lots of info with Redding and bushings. If you load for it where did you get your reamer? Specs? Any other info appreciated
Thanks

 

[kevin9934]

Personal advice:

Buy both a whidden non bushing(.291) and a redding type-s FL to process the brass with .295 bushing

For brass prep with rem brass:
-Neck down to .295
-expand
-trim to 2.015/2.020
-moly lube neck inside/out
-neck turn to .015 wall thickness until you touch slightly the shoulder
- load and shoot
-Finally Anneal and your ready for serious load development.

Then after fireforming use the whidden die.

Normally you grab the PTG .2965 NK .081 FB but you can also have a No neck turning .298NK but you'll still have to neck turn...

With the .081 freebore it is prefect for magazine feed Application For 130/140 gr.

 

[kevin9934]

It is also possible that you will see a donuts after 5-6 reload even if you have properly turned into the shoulder junction. Inside neck turning will correct that.

Alot of brass prep but performance are great!

you can expect great velocity at relatively low pressure.

for example in my 26 inch barrel I push the 140's at 3150 with 61gr of H1000. This load pressure was tested by cooper creek in the us and run around 56-58 kpsi


GAP will have Hornady factory 6.5 saum brass ready for July 2015. No more neck turning!

 

[lwing]

Thanks for the reply, I modified my Tikka wsm mags to 3.380 coal, so was thinking the original GAp spec reamer .120 FB. Quite a few members have mentioned to me to stay away from PTG reamers.
JSG says send a dummy round to them and they will make a reamer. Just need my dies and turner first now.
. Whiddon recommends initially necking down with a non bushing die to avoid leaving a ring around the neck. Then turn? Then size again? Probably making it more complicated then it needs to be.

 

[kevin9934]

Both way work but th whidden way would require two die with different size otherwise you'll overwork the brass(especially if you start with 300 saum brass) concentricity will be awfull and from my test with their way it have leaved me with a bad donut after 3 firing.

PTG is no worst than JGS. I used a PTG without issue and now have a Dave Manson reamer(Best reamers on the market IMO)
Both PTG and JGS are Hit and miss , with sometime a ####ty customer services. If you wish to work with jsg save you some time and ask ptg for the print. Note that the gap 4s print is a little bit different than the std saum print. I would stick with the gap print.

.120 is fine if you want to but you dont really need longer than 2.920. You still want maximum neck to bearing contact and wont gain much with a longer FB. Maybe only with bullet like the 140 amax and matrix.

GAP have now switch to the .081 fb on their build since last year and half.

 

[Chinbullco]

Personal advice:

Buy both a whidden non bushing(.291) and a redding type-s FL to process the brass with .295 bushing

For brass prep with rem brass:
-Neck down to .295
-expand
-trim to 2.015/2.020
-moly lube neck inside/out
-neck turn to .015 wall thickness until you touch slightly the shoulder
- load and shoot
-Finally Anneal and your ready for serious load development.

Wondering why you anneal after case is fully prepped? Annealing prior to, makes case forming procedure much easier.