Varmint Hunter
Well-Known Member
I've got everything I need to start reloading for the 7PRC except a bushing for my Redding Type S dies. Can anyone tell me what size bushing they are using with the Peterson brass?
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7PRC - Peterson brass - Redding bushing?
- Thread starter Varmint Hunter
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CanisLupus
Well-Known Member
I'm not expecting my Peterson brass to arrive until Aug so I can't answer from experience. However, the easiest way I find is by measuring the O.D. of the neck with a bullet seated. Then, I use a bushing that is 0.004-inch smaller than that measured O.D. … I use an expander mandrel before seating bullets, so going 0.004-inch smaller gives a little something in the neck for the mandrel to expand. If you're not using a mandrel before seating bullets, get a bushing that is 0.002-inch smaller than your measured neck O.D. with a bullet seated, or whatever your desired 'neck tension' is.
My fired cases measure .3165
New brass .3065 after .2820 mandrel
New brass .3065 after .2820 mandrel
Varmint Hunter
Well-Known Member
At around $35 a piece, I don't consider them cheap. LOL
Varmint Hunter
Well-Known Member
I have all Redding Ti bushings. Other than the sizes that no one uses, they sell about $35 universally.
RUFFIAN R - NY
Well-Known Member
Just remember each batch of brass may be of a different size. I always get at least 500 of the same batch and never have too worry about bushings... Good luck and good shooting
I measure the neck wall thickness of several pieces of brass to come up with an average.
Then double that measurement, add OD of bullet then subtract for the amount of neck tension you want. Example: My 6.5 Creedmoor Lapua brass has an average neck wall thickness of 0.014". Bullet diameter is 0.264". I like 0.002" of interference fit/neck tension.
0.014"
0.014"
+0.264"
———-
=0.292"
-0.002"
———-
=0.290" bushing size for non-mandrel method.
This method does require a 0-1" tube micrometer. Mine is a SHARS with readings to 0.0001"
Measuring the OD of neck with bullet seated is the easiest if you have one. If starting from scratch I find the measurement method easier vs. prepping a new piece of brass, seating a bullet, measuring, pulling the bullet, and resizing that piece of brass.
Then double that measurement, add OD of bullet then subtract for the amount of neck tension you want. Example: My 6.5 Creedmoor Lapua brass has an average neck wall thickness of 0.014". Bullet diameter is 0.264". I like 0.002" of interference fit/neck tension.
0.014"
0.014"
+0.264"
———-
=0.292"
-0.002"
———-
=0.290" bushing size for non-mandrel method.
This method does require a 0-1" tube micrometer. Mine is a SHARS with readings to 0.0001"
Measuring the OD of neck with bullet seated is the easiest if you have one. If starting from scratch I find the measurement method easier vs. prepping a new piece of brass, seating a bullet, measuring, pulling the bullet, and resizing that piece of brass.
RUFFIAN R - NY
Well-Known Member
the above sounds great to me- have done that in the past - also do each batch of bullets
Hammer101st
Well-Known Member
How did you guys get 7prc peterson brass allready
Billy Bob Peterson is my uncle's wife's 3rd cousin's best friend.
Naw I'm kiddin. my GS hooked me up with some when I bought a custom from him.
Naw I'm kiddin. my GS hooked me up with some when I bought a custom from him.
Hammer101st
Well-Known Member
I knew they were coming out with it but never seen any.
Varmint Hunter
Well-Known Member
Just an update:
I stopped being lazy while waiting for my rifle to be completed and seated a 180 Berger bullet into a new Peterson case. The neck measured .3115". Based on that measurement, I'll probably need a .309 bushing. I checked my box of spare Ti Redding bushings and found a .307" & a .309" bushing just waiting to be put into use.
I slide the .309 bushing over the neck of a factory new piece of Peterson brass and it slide down with light resistance. It looks like the .309 should work fine.
I stopped being lazy while waiting for my rifle to be completed and seated a 180 Berger bullet into a new Peterson case. The neck measured .3115". Based on that measurement, I'll probably need a .309 bushing. I checked my box of spare Ti Redding bushings and found a .307" & a .309" bushing just waiting to be put into use.
I slide the .309 bushing over the neck of a factory new piece of Peterson brass and it slide down with light resistance. It looks like the .309 should work fine.
