338 SHERMAN MAX

DBoone

Well-Known Member
Joined
Feb 22, 2018
Messages
52
Location
B.C. Canada
Who’s running 250 Elite Hunters? What’s COAL?
Is H100v the best choice?
Running ladder ...... finally..... I know it’s been a while and I’m not seeing speeds I was hoping.
Cheers
I just pressed some fireforming loads with the 250 Berger. COAL with 10 thou jump was 3.195". Rifle was throated long to eventually shoot some mono's.

For fun I'm going to try Berger's seating depth test, even though it's a fireforming load. After I finish barrel break-in and fireforming, I'll be moving to load development with 250 class bullets.
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Ok here we go......finally after some months (took that long to fire form 50rnds) did the start of a ladder.
Barrel fully cleaned and started w/ 3 FF loads to foul
Fully formed stamped brass
2k bump
FL sized w/ turning mandrel ran through after
CCI 250’s
H100v
250 Berger Elite’s
2.3050 ogive w/ Hornaday comparator
3.1550 COAL
63 - 2557
63.5 - 2566
64 - 2583
64.5 - 2612
65 - 2639
65.5 - 2665
66 - 2658
66.5 - 2621
67 - 2716
67.5 - 2728
Ran out of daylight and loads......guess I load 67.5 - ???
Hard hearing crunch, but I think 65g is the beginning of crunch??
Gurus?
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Pretty slow! You must not have ANY pressure yet at that velocity?
What barrel?

20” Hells Canyon wrapped Benchmark..... 0 pressure. If I handed anyone the spent 63g and 67.5g case you’d have a 50% chance of picking the case to charge.
 

elkaholic

Official LRH Sponsor
Joined
Dec 4, 2008
Messages
9,617
Location
hauser, id.
Ok here we go......finally after some months (took that long to fire form 50rnds) did the start of a ladder.
Barrel fully cleaned and started w/ 3 FF loads to foul
Fully formed stamped brass
2k bump
FL sized w/ turning mandrel ran through after
CCI 250’s
H100v
250 Berger Elite’s
2.3050 ogive w/ Hornaday comparator
3.1550 COAL
63 - 2557
63.5 - 2566
64 - 2583
64.5 - 2612
65 - 2639
65.5 - 2665
66 - 2658
66.5 - 2621
67 - 2716
67.5 - 2728
Ran out of daylight and loads......guess I load 67.5 - ???
Hard hearing crunch, but I think 65g is the beginning of crunch??
Gurus?
Doc ran up to 71 grains but I dont know if he used a drop tube or what?
RL16 or 17 might be better?
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Doc ran up to 71 grains but I dont know if he used a drop tube or what?

I took a spent case from today with a 250 marked in pencil at the case mouth with modified case. Bullet bottoms out on 65g and just a smidge of pencil line above case mouth.
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
All off of a Lab Radar..... lent my Magneto out but typically I would have both running as cross checks
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Got up to 69.5g of 17 loaded up with 250EH just touching. Plan on Friday afternoon session.
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Ok shot yesterday..... update RL17, CCI250, Berger 250EH AND a 20” tube!

67.0=2803
67.5=2820
68.0=2857
68.5=2859
69.0=2872
69.5=NoGo

DD126944-5525-468D-B759-15EB426331F2.jpeg


all loads unfortunately were compressed..... felt like I may have made a diamond or 2.
69g showed ejector mark (AN on SHERMAN) and flattened the primer a bit. Still think other powers need explored - N540, 550, or 555??
Thoughts??
Cheers
 

Broncoguy

Well-Known Member
Joined
Nov 26, 2012
Messages
506
Location
Oregon
Still searching......
Scratch H4350 😔
67-68g wielded a measly 2733-2744 w/ the 250EH
Who knows where 6.5 staball burn rate lands? I have a pound....
 

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