300 SAUM Imp

[tom]

Took my 204.5s out today to see if there was any gain in precision from pointing or trimming and pointing. The "that looks about right" stab I took actually shot progressively worse as they hit higher/were more closed. Just part of the tuning process, and if I get back to this I will try them "less aggressive".



Tom

 

[taylorw]

Took my 204.5s out today to see if there was any gain in precision from pointing or trimming and pointing. The "that looks about right" stab I took actually shot progressively worse as they hit higher/were more closed. Just part of the tuning process, and if I get back to this I will try them "less aggressive".

View attachment 1239954

Tom

This is a step that I’d like to learn more about. Are you basing your results strictly on group shape/size at a given powder charge or will you do a similar test as you would with primers and neck tension, by bracketing the powder node to see if the tune widens and becomes more forgiving? Awesome post!

 

[tom]

This is a step that I’d like to learn more about. Are you basing your results strictly on group shape/size at a given powder charge or will you do a similar test as you would with primers and neck tension, by bracketing the powder node to see if the tune widens and becomes more forgiving? Awesome post!

Just group sizes/shapes with the best load once I've found that load. Preferably soon enough after a powder test to make sure it should be in, or very close to in tune. I've found it to be something that's "tunable", but always start with "unmodified" for the foundation load first. You can close them up too much they just don't group, and I kind of have an idea where that's at for 6mm’s, and apparently don't for 30s yet! I'll eventually find some "recipe" that improves grouping, or it'll be the 2nd bullet I've ever shot I could not improve upon. Looks like she's going to the first couple matches "unmolested" until I have more time however.

Tom

 

[tom]

@taylorw

Wait until you see the stupid shit I'm testing tomorrow! LOL

Tom

 

[taylorw]

@taylorw

Wait until you see the stupid shit I'm testing tomorrow! LOL

Tom

Looking forward to it!

 

[Alex Wheeler]

I hope it's not stupid

 

[waybones]

I usually rely on an educated guess or blind ass luck

 

[tom]

Some Thursday evening tuning at DeepCreek. So still my 204.5s, loaded at 59.28. The touch number has moved out .001". I forgot to put any tension on my front ears, but can't say that really effected it or not. She seems to transition from a vertical shape to horizontal shape in the exact same zone as at home, AND a month or more ago....so it's nice to see it holding up over time, and different atmosphere.





I will shoot -10 and -8 Fri morning and go from there.

Tom

 

[savageshooter86]

Some Thursday evening tuning at DeepCreek. So still my 204.5s, loaded at 59.28. The touch number has moved out .001". I forgot to put any tension on my front ears, but can't say that really effected it or not. She seems to transition from a vertical shape to horizontal shape in the exact same zone as at home, AND a month or more ago....so it's nice to see it holding up over time, and different atmosphere.
View attachment 1244639




I will shoot -10 and -8 Fri morning and go from there.

Tom

Very nice. 11 looks great if you know that out shot was condition or you. Very solid groups

 

[tom]

After all that she went 7.5 in the first relay lol. It did shoot a 6.5 in some wind later on with not much vertical at all, so who knows. The 6.5 was good enough to win the relay, but the 7.5 not so much.. May be the bench 1 thing that plagues us occasionally or not, we'll see a couple more targets tomorrow.

 

[Louisb]

To begin with I want to thank Alex and Sam for sharing their reamer designs and to all of those that have contributed data and information to this thread. Based on these designs I spec'd a reamer and had an F-Class gun chambered for a 300 SAUM Imp. I am using 7 SAUM ADG brass necked up to 30 cal. The barrel is a straight 1.25 Krieger with 9 twist. After fire forming I began load development with 215 Berger Hybrid/H-4350/CCI 250's. I ran a rough ladder @ 955 yards (cuz that is all I could get) starting with 59.6 grains through 62.4 grains in 0.4 grain increments. These loads were jumped 0.020. It was somewhat windy for this effort, 7-12 mph and very variable (moving around a good bit) but was a comfortable 72 F. BTW I am in South Louisiana so just above sea level. I fired 3 shots at each charge as follows:

-Shots 1-3 (59.6)--Avg MV-2793fps
-Shots 4-6 (60.0)--Avg MV-2816
-Shots 7-9 (60.4)--Avg MV-2829
-Shots 10-12 (60.8)--Avg MV-2852
-Shots 13-15 (61.2)--Avg MV-2871
-Shots 16-18 (61.6)--Avg MV-2887
-Shots 19-21 (62.0)--Avg MV-2909 (excluding Shot 21)
-Shots 22-24 (62.4)--Avg MV-2920

Overall, looks like merging @ 62 and 62.4. I enlarged the screenshot from ShotMarker so Shots 1, 3, and 6 are off the screen. However, Shot 1 in the top of the 6 Ring below Shot 2 and very slightly left. Shot 3 located in 6 Ring in the center and 6 is located at the bottom of the 7 Ring in the center. Shot 21 had an abnormally low MV based on LabRadar and also at Target using ShotMarker data. Later I loaded and shot 3 rounds charged with 62.2 grains with everything else the same. The second pic illustrates those shots. Am planning to do another ladder test to confirm and will work on seating depth after that.

 

[kev77]

To begin with I want to thank Alex and Sam for sharing their reamer designs and to all of those that have contributed data and information to this thread. Based on these designs I spec'd a reamer and had an F-Class gun chambered for a 300 SAUM Imp. I am using 7 SAUM ADG brass necked up to 30 cal. The barrel is a straight 1.25 Krieger with 9 twist. After fire forming I began load development with 215 Berger Hybrid/H-4350/CCI 250's. I ran a rough ladder @ 955 yards (cuz that is all I could get) starting with 59.6 grains through 62.4 grains in 0.4 grain increments. These loads were jumped 0.020. It was somewhat windy for this effort, 7-12 mph and very variable (moving around a good bit) but was a comfortable 72 F. BTW I am in South Louisiana so just above sea level. I fired 3 shots at each charge as follows:

-Shots 1-3 (59.6)--Avg MV-2793fps
-Shots 4-6 (60.0)--Avg MV-2816
-Shots 7-9 (60.4)--Avg MV-2829
-Shots 10-12 (60.8)--Avg MV-2852
-Shots 13-15 (61.2)--Avg MV-2871
-Shots 16-18 (61.6)--Avg MV-2887
-Shots 19-21 (62.0)--Avg MV-2909 (excluding Shot 21)
-Shots 22-24 (62.4)--Avg MV-2920

Overall, looks like merging @ 62 and 62.4. I enlarged the screenshot from ShotMarker so Shots 1, 3, and 6 are off the screen. However, Shot 1 in the top of the 6 Ring below Shot 2 and very slightly left. Shot 3 located in 6 Ring in the center and 6 is located at the bottom of the 7 Ring in the center. Shot 21 had an abnormally low MV based on LabRadar and also at Target using ShotMarker data. Later I loaded and shot 3 rounds charged with 62.2 grains with everything else the same. The second pic illustrates those shots. Am planning to do another ladder test to confirm and will work on seating depth after that.

Whats the freebore length on this reamer?

 

[Louisb]

Whats the freebore length on this reamer?

0.190”

 

[kev77]

0.190”

Thanks . Have you done anymore test?

 

[Louisb]

FThanks . Have you done anymore test?

Took time to fire formed a100 pieces of brass. Am finding need to have at least 2 but probably 3 firings before the loads get stable. Started out with 25 pieces dedicated for load development but trying to get in shape to shoot a match next week. Have done some rough seating depth but nothing significant. Am intending to do more this Sunday. Am shooting in a 600 yd match tomorrow just to get firings on the brass. Lol. Will report back when get more data.

 

[kev77]

Took time to fire formed more 100 pieces of brass. Am finding need to have at least 2 but probably 3 firings before stable. Started out with 25 pieces dedicated for load development but trying to get in shape to shoot a match next week. Have done some rough seating depth but nothing significant. Am intending to do more this Sunday. Am shooting in a 600 yd match tomorrow just to get firings on the brass. Lol. Will report back when get more data.

 

[kev77]

This is my fire forming load on a 26" test barrel. Don't know if this will help

 

[Louisb]

Thanks. I do want to explore a lower node. Am thinking may have started too high with my initial ladder test and only discernible node was around 2900-2920. At any rate my initial ladder started with MV of 2793 but that charge was jumping all around.

 

[Louisb]

Thanks. I do want to explore a lower node. Am thinking may have started too high with my initial ladder test and only discernible node was around 2900-2020. At any rate my initial ladder started with MV of 2793 but that charge was jumping all around. this is a little different than fireformimg 200 pieces

Am noticing there is a difference between fire forming 200 pieces of brass for this gun as opposed to a 6 BRX.

 

[kev77]

Am noticing there is a difference between fire forming 200 pieces of brass for this gun as opposed to a 6 BRX.

Recoil lol