300 SAUM Imp

[Ledd Slinger]

Hmmm...With ADG making the SAUM case, I might have to work with Alex and JGS on turning that reamer down to 6.5mm. Would be a laser beam

 

[Alex Wheeler]

Yes it would the way ADG and Bats hold pressure. I'll spec the reamers if you want to play with it.

 

[Ledd Slinger]

Yes it would the way ADG and Bats hold pressure. I'll spec the reamers if you want to play with it.

Yeah if you get bored and want to spec it that would be great. Thought came to mind because I have a couple 6.5 Rem Mags. Great round and really fast, but Remington is the only brass available and it takes a ton of prep work to make it half ass decent. I think Bertram makes 6.5RM as well but I’m not paying a premium price for that junk.

could rechamber to 6.5-7 SAUM Improved and be happy to know I have quality brass with ADG

 

[tom]

I think they make headstamped 6.5 saum already, should just be a simple Ackley improved, and work with the sizer for the 300 version.

Tom

 

[Ledd Slinger]

I think they make headstamped 6.5 saum already, should just be a simple Ackley improved, and work with the sizer for the 300 version.

Tom

Yep you’re right. Might have to order some and measure it out for a reamer design. Thanks Tom.

 

[kev77]

Glenn K , when you are fire forming your brass with h4350 were you jamming the 210 into the lands or just a crush fit off the shoulder. Thanks very much

 

[GlennK]

Glenn K , when you are fire forming your brass with h4350 were you jamming the 210 into the lands or just a crush fit off the shoulder. Thanks very much

I jammed them 15 ish into the lands,but the brass also was a crush fit.

 

[tom]

I plan on getting some data this weekend (Sunday) with this case and Berger 230s. Might as well since I'll be out testing some heavy 6mm's.

Tom

 

[GlennK]

Gun is getting close...primers next and then final seating. 210 vlds on the lower node.

 

[nakneker]

Yes it would the way ADG and Bats hold pressure. I'll spec the reamers if you want to play with it.

Did a Reamer spec ever materialize?

 

[Ledd Slinger]

Did a Reamer spec ever materialize?

Not yet. I will need to purchase some ADG 6.5 SAUM brass so I can measure it out.

 

[kev77]

I plan on getting some data this weekend (Sunday) with this case and Berger 230s. Might as well since I'll be out testing some heavy 6mm's.

Tom

What's your thoughts on the new 220gr Berger's

 

[Ledd Slinger]

What's your thoughts on the new 220gr Berger's

I started testing them in a 300 NMI at 500 yards. Really liking them so far. Tips are pointed and they seem to be very consistent. Got them up to 3170 fps in a 26” barrel with good accuracy and still have more throttle left.

So far, for my rifle anyhow, the 220s seem to be more forgiving than the 215s, 230s, and 245s I’ve tested. My barrel is a 1 in 9” twist. Have shot groups well under 1/2 MOA during initial testing with all 3 powders I’ve tried on the 220s so far (IMR7977, RL26, N570). Still have more testing and tuning to do with the 220s but I think they will end up shooting amazingly well.

with the 215s and 230s, they seemed to be more picky and only really liked one out of about 5 different powders I tried with them. Honestly didn’t test the 245s extensively and they didn’t shoot well for me with anything I tried

 

[Alex Wheeler]

I did just order a 7mm version though. Might have to run it in my Bat vampire action

 

[tom]

Here's the data from a coarse ladder with 230 hybrids, never hit any pressure, but did see a longer seated length on the highest charge due to case fill. Heard a rumor that @Ledd Slinger has a solution for that problem however



Pretty impressive knowing the volume of this case is actually 3+ grains less than the wsm. I would include ADG as the brass to look at with lapua when deciding on a build at this point.


Tom

4" black dot with a 2" white dot for scale.

 

[Ledd Slinger]

Here's the data from a coarse ladder with 230 hybrids, never hit any pressure, but did see a longer seated length on the highest charge due to case fill. Heard a rumor that @Ledd Slinger has a solution for that problem however

View attachment 1206566

Pretty impressive knowing the volume of this case is actually 3+ grains less than the wsm. I would include ADG as the brass to look at with lapua when deciding on a build at this point.


Tom

4" black dot with a 2" white dot for scale.

I like the use of two rounds with each charge instead of single rounds on ladder tests. Definitely more effective on identifying the POI for nodes.

Of course even more rounds could be better, but I think the two round method gives a person a good enough idea where to start tuning seating depths and neck tension

 

[tom]

I like the use of two rounds with each charge instead of single rounds on ladder tests. Definitely more effective on identifying the POI for nodes.

Of course even more rounds could be better, but I think the two round method gives a person a good enough idea where to start tuning seating depths and neck tension

Yes I always use 2 for coarse unless it's a sporter barrel. Basically whatever the barrel will handle before walking from heat is what I plan around. I fully expected to have to pull some from pressure, but never got there, although it should be nearly there. Knowing I was searching for the top end, I fired both of each charge from low to high, and a quick inspection before moving on.

Tom

 

[Ledd Slinger]

Yes I always use 2 for coarse unless it's a sporter barrel. Basically whatever the barrel will handle before walking from heat is what I plan around. I fully expected to have to pull some from pressure, but never got there, although it should be nearly there. Knowing I was searching for the top end, I fired both of each charge from low to high, and a quick inspection before moving on.

Tom

Would you say 64.3 is close to max pressure or does it have a some throttle left? Wondering if it’s trying to get into another node up top.

Awesome speeds with 230 for such a small charge weight. That round is amazingly efficient

 

[tom]

Would you say 64.3 is close to max pressure or does it have a some throttle left? Wondering if it’s trying to get into another node up top.

Awesome speeds with 230 for such a small charge weight. That round is amazingly efficient

I would assume so, but I had to work at getting that much in the case so I suspect we won't be able to find out how close.

Tom

 

[savageshooter86]

Here's the data from a coarse ladder with 230 hybrids, never hit any pressure, but did see a longer seated length on the highest charge due to case fill. Heard a rumor that @Ledd Slinger has a solution for that problem however

View attachment 1206566

Pretty impressive knowing the volume of this case is actually 3+ grains less than the wsm. I would include ADG as the brass to look at with lapua when deciding on a build at this point.


Tom

4" black dot with a 2" white dot for scale.

So will you work in 63.1-63.7 gr area? Since those three printed same POI