30 sherman magnum

[JBarton]

I've settled on a load for this 30 Sherman Magnum. I'm running a Archimedes action, 28" 8 twist chambered by straight jacket Armory, timney calvin elite 2 stage, KRG X-ray, EC tuner brake, atlas cal, wiebad mini fortune cookie bag, Vortex PMR rings and a Bushnell XRS ii.
Tonight I was verifying velocities and the tuner brake setting. A few nights ago I dialed in my powder charge and settled on a seating depth. Thank you Rich @elkaholic for pointing me in the right direction on seating depth. See results below.
30 Sherman Magnum ADG brass
225gr ELDM's
215m lmrp
225gr ELDM's jumped 0.040"
77.8gr RL26
CBTO: 2.890"
COAL: 3.675"
25 shot data:
ES: 25
SD: 6.1
Avg: 3028fps
First set of shots were 0.1gr jumps from 77.6gr to 77.9gr of RL26. I had 2 strings per powder charge where 1 had 0.025" jump and the other had 0.035". I picked the middle of the pack powder charge to build off of with a little more jump.

Shots from tonight to dial in the tuner. I am going to run it on setting #4 for now.

Not my best night for groups, but good data either way. Been battling a nasty cold for the past few days...that's my excuse lol.

I might have to use my IMR7977 at the rate I've been going through consumables. I'm down to less than 5lbs of RL26. The IMR7977 was doing well and was within 15fps compared to the same powder charge of H1000 on my 300PRC barrel. I might even have to swap back to my other barrel (300PRC) if I don't get decent results with 7977 and this 30SM barrel. Who knows with the powder situation. .

 

[JBarton]

I've registered for the Nightforce ELR match in Casper this June. In turn I am going to try to run 250gr A-Tips through my 30SM. So far I've mocked up a dummy round to fit in my magazines. My COAL is 3.760" which gives me around 0.085" jump. I'm going to be doing my ladder using RL33 but not 100% sure where I am going to start.

I'm thinking about starting around 78gr and work my way up in 0.3gr increments. Looking at my existing loads I am currently running 86.4gr RL33 pushing 225gr ELDM 3030fps and figure I will be around 5 grains below that with the A-Tips.
Any and all feedback is appreciated.

 

[Broncoguy]

I'm interested to see what you'll get with that combo!

 

[Copper Basin]

I've registered for the Nightforce ELR match in Casper this June. In turn I am going to try to run 250gr A-Tips through my 30SM. So far I've mocked up a dummy round to fit in my magazines. My COAL is 3.760" which gives me around 0.085" jump. I'm going to be doing my ladder using RL33 but not 100% sure where I am going to start. View attachment 339871 I'm thinking about starting around 78gr and work my way up in 0.3gr increments. Looking at my existing loads I am currently running 86.4gr RL33 pushing 225gr ELDM 3030fps and figure I will be around 5 grains below that with the A-Tips.
Any and all feedback is appreciated.

I am doing load work for the 250 A-Tips today and this weekend. I am using N570. My mag is not as long as yours so I run my COL at 3.697. My 245 berger loads runs 2950 through a 26" barrel. Another customer of mine gets 2970. Once I get mine figured out I will send the info to Ryan(@idahotrekker). Best of luck to you. They should fly real well.

 

[elkaholic]

I've registered for the Nightforce ELR match in Casper this June. In turn I am going to try to run 250gr A-Tips through my 30SM. So far I've mocked up a dummy round to fit in my magazines. My COAL is 3.760" which gives me around 0.085" jump. I'm going to be doing my ladder using RL33 but not 100% sure where I am going to start. View attachment 339871 I'm thinking about starting around 78gr and work my way up in 0.3gr increments. Looking at my existing loads I am currently running 86.4gr RL33 pushing 225gr ELDM 3030fps and figure I will be around 5 grains below that with the A-Tips.
Any and all feedback is appreciated.

 

[elkaholic]

I run 83.5 grs N570 behind a 245 Berger at 3002 with a 28" barrel. Max is about a grain more.
RL33 is about 5 grains slower so max with a 245 is around 88-89 grains in mine and will run 3050'+
I had wide nodes with the 245 and N570 with low es. Its VERY temp stable too!
I run the 245 at 3.830" coal with .015" jump. Shoots .2-.3 with excellent vertical

 

[Kmccord]

I run 83.5 grs N570 behind a 245 Berger at 3002 with a 28" barrel. Max is about a grain more.
RL33 is about 5 grains slower so max with a 245 is around 88-89 grains in mine and will run 3050'+
I had wide nodes with the 245 and N570 with low es. Its VERY temp stable too!
I run the 245 at 3.830" coal with .015" jump. Shoots .2-.3 with excellent vertical

What is your elevation when you are achieving that speed? The reason I ask, I plan to build a 30 Sherman Mag, but my elevation is at 440' above sea level. I have seen others post there FPS and find out they are up in the high country.

 

[JBarton]

I run 83.5 grs N570 behind a 245 Berger at 3002 with a 28" barrel. Max is about a grain more.
RL33 is about 5 grains slower so max with a 245 is around 88-89 grains in mine and will run 3050'+
I had wide nodes with the 245 and N570 with low es. Its VERY temp stable too!
I run the 245 at 3.830" coal with .015" jump. Shoots .2-.3 with excellent vertical

Thanks @elkaholic. That's good to know. I'm runninga 28", 8 twist Bartlein and was figuring I would be able to push the 250gr A-Tips set to mag length (0.085" jump) with a modest middle of the road load. I will run up a little higher now. I am thinking I might broaded amount of powder between each charge weight from 0.3gr to 0.5gr. That way I am not wasting components and barrel life.
You would think I would have learned a lesson from my RL33 225gr ELDM ladder. Ran up to 90.0gr at 3124fps that was just starting to flatten my primers a little bit.
I will post results for the 250gr A-Tips.

Here is my RL33 load with 225gr ELDM's
28" 8 twist M24 Bartlein with an EC tuner.
Archimedes action In KRG X-ray
Timney Calvin Elite 2 stage trigger at 12oz
CIP mags
30SM ADG brass
215M primers
225gr ELDM
86.4gr RL33
CBTO: 2.885" with 0.040" jump
COAL: 3.670"
Average speed at 3025fps
Average ES:15
Average SD: 5
0.375 moa

 

[elkaholic]

Thanks @elkaholic. That's good to know. I'm runninga 28", 8 twist Bartlein and was figuring I would be able to push the 250gr A-Tips set to mag length (0.085" jump) with a modest middle of the road load. I will run up a little higher now. I am thinking I might broaded amount of powder between each charge weight from 0.3gr to 0.5gr. That way I am not wasting components and barrel life.
You would think I would have learned a lesson from my RL33 225gr ELDM ladder. Ran up to 90.0gr at 3124fps that was just starting to flatten my primers a little bit.
I will post results for the 250gr A-Tips.

Here is my RL33 load with 225gr ELDM's
28" 8 twist M24 Bartlein with an EC tuner.
Archimedes action In KRG X-ray
Timney Calvin Elite 2 stage trigger at 12oz
CIP mags
30SM ADG brass
215M primers
225gr ELDM
86.4gr RL33
CBTO: 2.885" with 0.040" jump
COAL: 3.670"
Average speed at 3025fps
Average ES:15
Average SD: 5
0.375 moa

I think N570 will lower your es

 

[JBarton]

I think N570 will lower your es

I wish I could find some to be honest with you.
I also average 20 plus rounds to get my ES and SD.

 

[JBarton]

I'm hoping to get out tomorrow and try these out. Running up to 88 grains of RL33.

 

[elkaholic]

I'm hoping to get out tomorrow and try these out. Running up to 88 grains of RL33. View attachment 340119

 

[elkaholic]

Should be safe there.

 

[snox801]

What is your elevation when you are achieving that speed? The reason I ask, I plan to build a 30 Sherman Mag, but my elevation is at 440' above sea level. I have seen others post there FPS and find out they are up in the high country.

I'm getting 3180fps with the 214gr hammer
Out of my 26" at 315' of elevation.
I'm following this as I have a pile of the atips I may try for fun. I have plenty rl26 and 33 to try.