Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Wytex, ocardwell, Highcountryrider, MechWario, PMURT2017
60466 Registered Users
Top Posters
dogcatcher 77435
stxranchman 52092
RWH24 44568
rifleman 43786
BOBO the Clown 41109
BMD 40539
Big Orn 37484
txshntr 33685
bill oxner 32651
sig226fan (Rguns.com) 30571
facebook
Forum Stats
60466 Members
45 Forums
476036 Topics
6244644 Posts

Max Online: 16728 @ 03/25/12 08:51 AM
Page 1 of 2 1 2 >
Topic Options
#6531079 - 11/07/16 01:31 PM 257 wby help
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx



All three were fired in the same group. Load was a 100gr mk over 70 gr of imr 7828 in hornady brass. This should have been a max load. 70.5 had primer blow by and 71 blew the primer. I'm afraid to go lower because I'm already below book minimum. Any ideas to try or just find a new powder?

Top
#6531105 - 11/07/16 01:47 PM Re: 257 wby help [Re: bo323]
redchevy Online   content
THF Celebrity

Registered: 10/25/04
Posts: 23443
Loc: Texas
Might try to explain more clearly. You say should have been a max load... and your already below book min.

Loading below minimum listed charges is not recommended. Powders can do funny things with too small a volume of powder in the case and actually create higher pressure spikes than with a higher charge, called detonation.

I would check all your data and components again and try a min listed load and increase from there.
_________________________
It's hell eatin em live

Top
#6531108 - 11/07/16 01:49 PM Re: 257 wby help [Re: bo323]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
71 is a hot load. Back it down a grain or two and you will be good.
_________________________

www.DallasReloads.com
Type 01 and Type 06 FFL

Top
#6531116 - 11/07/16 01:52 PM Re: 257 wby help [Re: bo323]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
Minimum listed load is 70. I was a little off. I worked up the load to find the max in my gun. Max book load is 73 grains. 73 completely filled the case.

Top
#6531118 - 11/07/16 01:53 PM Re: 257 wby help [Re: bo323]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
This was at 70 grains.

Top
#6531121 - 11/07/16 01:54 PM Re: 257 wby help [Re: bo323]
redchevy Online   content
THF Celebrity

Registered: 10/25/04
Posts: 23443
Loc: Texas
Are all of your components of current manufacture?
_________________________
It's hell eatin em live

Top
#6531129 - 11/07/16 01:56 PM Re: 257 wby help [Re: bo323]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
Everything has been bought within the last year.

Top
#6531136 - 11/07/16 02:01 PM Re: 257 wby help [Re: bo323]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
If you look at various data, I'm showing max to be around 69 to 73 grains. It depends on the brass, seating depth, and a few other factors. If you blow primers at 71, that's a hot load. So about 70 grains is a max load, and you blew primers at 71, so you are past max for your combination of ammo.

Also, do NOT go but a few grains less than max. 7828 and a 257 Wby Mag are combo's that do not work well together as a reduced load or as a minimum load.
_________________________

www.DallasReloads.com
Type 01 and Type 06 FFL

Top
#6531146 - 11/07/16 02:06 PM Re: 257 wby help [Re: ChadTRG42]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
Originally Posted By: ChadTRG42
If you look at various data, I'm showing max to be around 69 to 73 grains. It depends on the brass, seating depth, and a few other factors. If you blow primers at 71, that's a hot load. So about 70 grains is a max load, and you blew primers at 71, so you are past max for your combination of ammo.

Also, do NOT go but a few grains less than max. 7828 and a 257 Wby Mag are combo's that do not work well together as a reduced load or as a minimum load.


Imr and Lyman both showed 73 for max. This happened at 70 grains. All three rounds in the original picture were loaded at 70. I want to stay near max otherwise a 257 wby is pointless(my opinion). I hadn't seen any data showing a max that low so I'll try to load a few around 69 give or take.

Top
#6531185 - 11/07/16 02:17 PM Re: 257 wby help [Re: bo323]
redchevy Online   content
THF Celebrity

Registered: 10/25/04
Posts: 23443
Loc: Texas
Are you just starting at the load that lists the FPS you want in the manual? That breaks like every rule of reloading.
_________________________
It's hell eatin em live

Top
#6531203 - 11/07/16 02:29 PM Re: 257 wby help [Re: bo323]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6220
Loc: Wise Co.
Winchester large rifle primers?
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

Top
#6531218 - 11/07/16 02:35 PM Re: 257 wby help [Re: bo323]
redchevy Online   content
THF Celebrity

Registered: 10/25/04
Posts: 23443
Loc: Texas
If I had to guess the are REM primers.
_________________________
It's hell eatin em live

Top
#6531225 - 11/07/16 02:37 PM Re: 257 wby help [Re: bo323]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
What the book shows as max should be a guide to use as you work up to max in your rifle. You rifle has found max before the book shows with the set up you are running. Also, in the Hornady manual with a Hornady brass and Hornady 100 grain SP, I'm showing 66.8 grains as max with 7828.

For S&G, I ran your info in QuickLoad- 70.0 grains of IMR 7828 with a 100 grain SMK seated to 3.170" is showing to be 62500 psi. So, it's a max or near max load. If you seat the bullet deeper, this will increase the pressure. If the Hornady brass has less case capacity and/or tighter necks than the Wby brass used in the manuals, than this will all raise your pressures. If you knew the speeds with a chronograph, then I could tell you more of where you are on max or not. But with your combination, you have pressure signs at 70, so this should be over max in your rifle with the components you are using. If the others were fine and this one blew and you don't know why, then that's something to figure out.
_________________________

www.DallasReloads.com
Type 01 and Type 06 FFL

Top
#6531257 - 11/07/16 02:53 PM Re: 257 wby help [Re: redchevy]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
Originally Posted By: redchevy
Are you just starting at the load that lists the FPS you want in the manual? That breaks like every rule of reloading.


No. I started at min and worked up. I stopped at 71 because it blew a primer.

Top
#6531268 - 11/07/16 02:56 PM Re: 257 wby help [Re: ChadTRG42]
bo323 Offline
Tracker

Registered: 09/24/11
Posts: 706
Loc: Snyder, tx
Originally Posted By: ChadTRG42
What the book shows as max should be a guide to use as you work up to max in your rifle. You rifle has found max before the book shows with the set up you are running. Also, in the Hornady manual with a Hornady brass and Hornady 100 grain SP, I'm showing 66.8 grains as max with 7828.

For S&G, I ran your info in QuickLoad- 70.0 grains of IMR 7828 with a 100 grain SMK seated to 3.170" is showing to be 62500 psi. So, it's a max or near max load. If you seat the bullet deeper, this will increase the pressure. If the Hornady brass has less case capacity and/or tighter necks than the Wby brass used in the manuals, than this will all raise your pressures. If you knew the speeds with a chronograph, then I could tell you more of where you are on max or not. But with your combination, you have pressure signs at 70, so this should be over max in your rifle with the components you are using. If the others were fine and this one blew and you don't know why, then that's something to figure out.


I realize the book max is a guide. I was afraid to work below the minimum charge because sometimes things get crazy. your information makes me feel a lot better working below 70.

Top
Page 1 of 2 1 2 >



© 2004-2016 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide