Hi guys – I’m an older fella and longtime former competitive skeet shooter (well, I competed and maybe leave it at that! haha) who is relatively new to rifles and definitely new to reloading metallic. My good friend @GBMaryland has been helping/advising me and my bringing some questions to the forum in no way indicates a lack of confidence in him. But, I do have some questions that I think would be beneficial to ask of a larger audience. However, I will try not to do a mag dump here and will attempt to limit my questions and try to keep a bit focused.
My initial questions go to my first time doing load development.
I have read the last 10 pages of the 6.5 thread here on the Hide, read about Newberry, Satterlee, and Accurate Shooter articles, watched various vids, and even tried to slog through the thread that @Dthomas3523 started questioning some cherished tenets of load dev (which I mostly didn’t understand haha). I do kind of have a plan in mind and submit it, along with a couple of questions, for you kind comment and critique.
Background info:
I have to run out now for a few hours so if you are kind enough to reply, please don’t feel disrespected if I don’t acknowledge it immediately.
Cheers and thanks for any who have taken the time to reply.
My initial questions go to my first time doing load development.
I have read the last 10 pages of the 6.5 thread here on the Hide, read about Newberry, Satterlee, and Accurate Shooter articles, watched various vids, and even tried to slog through the thread that @Dthomas3523 started questioning some cherished tenets of load dev (which I mostly didn’t understand haha). I do kind of have a plan in mind and submit it, along with a couple of questions, for you kind comment and critique.
Background info:
- Load is 6.5 CM
- Rifle has a 24” Proof SS barrel with 7.5 twist, 970 rounds down it, and it’s fairly fast...factory Berger 140 Hybrid avg 2870 and Hndy ELD-M avg 2800
- After some practice with the Hndy OAL gauge, I have a fairly good CBTO to the lands of 2.224
- Brass is Hndy once fired (by me)
- Dry media tumbled
- FL sized with Redding die w .002 should bump back
- trimmed slightly short to 1.9” on GBMaryland’s Giraud (mine is on order)
- Tumbled again and primed with CCI BR-2
- RCBS MatchMaster (kudos to RCBS for great vet discount)
- Using a Redding Big Boss II and Redding micrometer competition seating die with VLD stem
- Will use H4350 and Berger 140 gr Hybrids
- Load a range of powder drops with the same seating depth
- Shoot 3 at each load increment
- Chrono w LabRadar
- Look for flat spot in speeds to make load a bit more tolerant of variation and hope to see one fall around the 2800-2850 or so fps I’m getting out of factory as they seems to shoot well in my gun
- I have the software that a member posted for uploading and graphing LabRadar data…but still have to read the instructions and mess with it a bit
- Zero in on any found flat spot(s)…maybe reduce increment size of load and shoot five shots at each load with chrono and look at groups
- Then with selected load, adjust seating depth for group size
- Where to start/end initial powder load ladder and what increments to use (i.e. .from X to Y grains in .3 grain increments or???). I note that Berger’s book shows min/max load of H4350 for the 140 bullets as 36.5/40.7 but note that almost every load I have seen listed here is more than that…ranging from 41.3 to 42.3. Starting at 36.5 doesn’t seem too reasonable??? And over 42 seems….well, I sort of know what to look for wrt to pressure signs but as a new reloader I’m not sure how hard I should press this.
- What bullet seating depth to use for initial chrono/group shots? I believe I have read that the Berger hybrids are fairly jump tolerant and I thought that somewhere I read that they like .0060-.0090 jump but I can’t swear to it. What would you set as the jump for the initial chrono/group loads?
I have to run out now for a few hours so if you are kind enough to reply, please don’t feel disrespected if I don’t acknowledge it immediately.
Cheers and thanks for any who have taken the time to reply.