RockyMtnMT
Official LRH Sponsor
Yes we will develop up to a 7" twist in the 6mm.
Introducing the Absolute Hammer
- Thread starter RockyMtnMT
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RockyMtnMT
Official LRH Sponsor
We should start getting feedback from guys today. The first shipments hit loading benches yesterday.
RH300UM
Well-Known Member
Just got back from the range
Here's my results for the AH
All shots from a bench over a magneto speed
Temp started 35 degrees and warmed to 47 degrees by the end of the session as the sun came up
7saum, 26 inch brought 5c, 9 twist
ADG brass, once fired, neck turned to .016, annealed in a AMP machine, shoulder bumped to .002
Fed 215 GM primers
Seated the bullet to a COAL of 2.966. With .002 neck tension
Started at 64 grains of RL26 and went up to 67 grains, 1 grain increase per increment. 2 cases for each.
64- 3229,3237
65- 3242,3232
66- 3270,3280
67- 3316,3326
67 grains is a full case
I did load a compressed 2 at 68 to see the results
68- 3425,3439 and primer flow into the firing pin hole.
With this rifle/case/powder/bullet combo 67 is the top end load I would go for.
7RBH, 26 inch Proof Research carbon, 8.4 twist.
Lapua brass, once fired, annealed With AMP, shoulder bumped .002
Fed 215 GM primer
Seated bullets to a COAL 3.40 With .002 neck tension
Started at 88 grains of RL26 and went to 93 grains in 1 grain increments, 2 cases per increment
88- 3426,3430
89- 3445, 3434
90- 3519, 3502
91- 3562, 3567
92- 3620, 3615 pressure, bolt stiff at top of stroke
93- did not shoot as pressure was shown at 92
Now the interesting part. The 7saum showed the better of the 2 for accuracy across all powder charges.
The 7rbh was 2 inch groups at best. I believe because the chamber was cut for the 195 Berger and with the 155 the jump is very substantial.
These are my preliminary findings so far.
Here's my results for the AH
All shots from a bench over a magneto speed
Temp started 35 degrees and warmed to 47 degrees by the end of the session as the sun came up
7saum, 26 inch brought 5c, 9 twist
ADG brass, once fired, neck turned to .016, annealed in a AMP machine, shoulder bumped to .002
Fed 215 GM primers
Seated the bullet to a COAL of 2.966. With .002 neck tension
Started at 64 grains of RL26 and went up to 67 grains, 1 grain increase per increment. 2 cases for each.
64- 3229,3237
65- 3242,3232
66- 3270,3280
67- 3316,3326
67 grains is a full case
I did load a compressed 2 at 68 to see the results
68- 3425,3439 and primer flow into the firing pin hole.
With this rifle/case/powder/bullet combo 67 is the top end load I would go for.
7RBH, 26 inch Proof Research carbon, 8.4 twist.
Lapua brass, once fired, annealed With AMP, shoulder bumped .002
Fed 215 GM primer
Seated bullets to a COAL 3.40 With .002 neck tension
Started at 88 grains of RL26 and went to 93 grains in 1 grain increments, 2 cases per increment
88- 3426,3430
89- 3445, 3434
90- 3519, 3502
91- 3562, 3567
92- 3620, 3615 pressure, bolt stiff at top of stroke
93- did not shoot as pressure was shown at 92
Now the interesting part. The 7saum showed the better of the 2 for accuracy across all powder charges.
The 7rbh was 2 inch groups at best. I believe because the chamber was cut for the 195 Berger and with the 155 the jump is very substantial.
These are my preliminary findings so far.
Joemac6324
Active Member
I can't believe nobody ever saw Butter Bean in strong man contests. I used to watch it. He had some kind of inhuman strength.
Going to start with 280 A.I. as have good load with barnes lrx 168 gr getting 2910:fps. Mine coming Monday so should get done next week. Next 280 Rem, 7-08 and 7 stw. Should be fun.
RH300UM
Well-Known Member
7 saum load development is a go.
I can handle this!
Switched primers to CCI 250's
It liked it!!!
6 for the ES!
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Thanks for the great info! Those readings are nice to see.
How do you think a 8 twist in the 7saum would do? Mine is cut for 175-180 Berger and shoots the 155HH very well at 3020 with H1000 2.99.
RH300UM
Well-Known Member
8 twist would be the ticket. My next SAUM barrel will be a 8!
He was one of my favorites to watch! He boxed a little on ESPN also. King of the 4 rounders!
I'm sold. Ordering a box of AB's right now!
dougduey
Well-Known Member
Great info!! Are you going to shoot that at further distances to see if the stability and accuracy holds up?? I didn't think a 9 twist would stabilize the AH, but it looks like you're proving that wrong. I have a 280 AI with a 9 twist that I'd love to use this bullet in. Looking forward to more updates from you.
RH300UM
Well-Known Member
Yes I plan on shooting at distance out to 1k to see what transpires
I'm at 5000 feet here in Idaho so the stability is affected slightly different
8.5 or 8 would be best. Just for the terminal performance From the extra RPMs Is a big plus
