Spike Camp

257 Loading Project

257 Loading Project
« on: October 03, 2018, 05:47:40 PM »
I got myself in a project testing new loads with my .257. There is so much data from the bullet makers, powder makers and shooters my head hurts.

Can anyone comment on the following combinations or suggest another combination with what i have? I have the powders, bullets and using Fed 215 primers with 3.25 OAL.  I'm trying to find an MOA or better group i can site in and leave.

So far my bee seems to like 120gr Nosler Partition, 71gr RL25, CCI250, 3.25 OAL

Combinations i am planning to reload

Nosler 115gr Partition, 70gr Norma MRP
Hornady 87gr spire point, 74gr MRP
Nosler 115gr BT,  69gr IMR7828SSC
Hornady 117gr SST, 71gr RL25

Again appreciate the input.
Your Bud T,

Re: 257 Loading Project
« Reply #1 on: October 03, 2018, 07:00:35 PM »
How good is the 120 group? I have never used any of the combos you are trying so I can't help there.If the 120 group is pretty good I would try changing seating depth of them down and up to try to dial that one in.You are already trying so many different bullets but have you tried any 100 grain yet?
Roger
Faster horses,younger women,older whiskey,and more money.

Re: 257 Loading Project
« Reply #2 on: October 04, 2018, 05:06:30 AM »
Mine loves 115g BERGER’s and H1000

Re: 257 Loading Project
« Reply #3 on: October 04, 2018, 05:20:47 AM »
Roger,

Yes i have tried Nosler 100gr BT only with RL25.  My groups where at best in the same county.... I think.  A bit of back ground.  I bought and reload for my 257 back in 87.  Lots of moving for the job and fast forward 30 years I revived my equipment but lost my load data.  I had lots of 30 year old bullets to use and a bit of information using 4831.

So back to today...  The 120's i used were 30 year old Nosler partitions.  Vertically the group was 1".  Horizontal deviation was 2" mostly due to high winds that day.

I have also read lots on OAL.  Would it be great of there was a flow chart for all this.

Again Thx, T
Your Bud T,

Re: 257 Loading Project
« Reply #4 on: October 04, 2018, 05:27:29 AM »
cacsrx1, would that be the Berger's VLD.  It appears to be their only .257 cal.
Your Bud T,

Re: 257 Loading Project
« Reply #5 on: October 04, 2018, 10:36:35 AM »
Do you know the twist that your 257 has. Some of the older ones have a 1/12, the newer ones 1/10. My Vanguard 257 with a 1/10 likes the 120 Sierra with RL-22. I also use Fed215 primers. Norma MRP is also a great powder in mine with 120 gr bullets.

Re: 257 Loading Project
« Reply #6 on: October 04, 2018, 03:33:05 PM »
Yes the twist is 1/10, #2 contour and 26”. In my collection I just happen to have some vintage 1988 Sierra bullets. Would you have any MRP suggestions for these?
Funny one box is marked 4.95. Long time since you got a 100 for that price....

Your Bud T,

Re: 257 Loading Project
« Reply #7 on: October 04, 2018, 03:41:30 PM »
I load the 115 gr Ballistic tips over 69 gr of MRP in my 257, and it's a near max load. Those  sierra's I would start at 67 gr MRP and work up.


Rob
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Re: 257 Loading Project
« Reply #8 on: October 04, 2018, 05:33:42 PM »
I loaded the 117 grain sierra with 70 grains of RL-25. They shot under an Inch
Mike

Re: 257 Loading Project
« Reply #9 on: October 04, 2018, 07:56:32 PM »
I load the 117gr Sierra's at max with IMR7828

Re: 257 Loading Project
« Reply #10 on: November 30, 2018, 08:04:23 AM »
My 257 really likes 110 accubonds and RL22.