JFrank
Member
What graph are you referring to ?
Limited Component Load Development
- Thread starter DMW1116
- Start date
I average and find the center of the groups, then graph their distance from the POA. The ones closest to each other in sequence are the ones I went with in the 55 grain load. When I graph the ones pictured here, the #7 and #8 loads are actually closer, but only by 0.01 inches.
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LiveLife
Member
I know what you mean ...
I built my first SPR (Special Purpose Receiver/Rifle) based on 18" .223 Wylde heavy barrel and built several since and recently finished 20" .223 Wylde fluted barrel for RMR 69/75 gr load development.
I am following your load development closely and taking notes as I am limited to H335/BL-C(2) on hand.
BTW, I have been referencing 11 part JRB channel videos for Mk 262 clone/Black Hills 77 gr OTM load development, this video particularly due to testing with BL-C(2) with surprising smaller groups compared to other powders.
Mk262 Cloning - pt 6 - BL-C(2) and TAC
The quest continues to duplicate the Black Hills 77gr OTM factory ammunition, also known as Mk 262 Mod 1. Today's test powders are Hodgdon BL-C(2) and Ramsh...
www.youtube.com
FYI, 11th summary video of all powders used
Cloning Mk 262 - Verifying Our Best Loads (so far)
It's time to go back and re-test our best loads from this series. The goal is to clone the 5.56 Black Hills 77gr OTM, aka Mk262 Mod 1.UPDATED 09/27/2018 - A...
www.youtube.com
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GeoDudeFlorida
Member
- Joined
- Dec 1, 2020
- Messages
- 11,052
Mine was a CLLE (Charger Loading Lee Enfield) receiver I was given because it was missing most of the parts. Vulch in Australia contributed a barrel (sent Parcel Post to, “Geoff Something, Florida, USA” - it actually made it to my doorstep addressed like that!I know what you mean ...
I built my first SPR (Special Purpose Receiver/Rifle) based on 18" .223 Wylde heavy barrel and built several since and recently finished 20" .223 Wylde fluted barrel for RMR 69/75 gr load development.
I am following your load development closely and taking notes as I am limited to H335/BL-C(2) on hand.
BTW, I have been referencing JRB channel for Mk 262 clone/Black Hills 77 gr OTM load development, this video particularly due to testing with BL-C(2) with surprising smaller groups compared to other powders.
Mk262 Cloning - pt 6 - BL-C(2) and TAC
The quest continues to duplicate the Black Hills 77gr OTM factory ammunition, also known as Mk 262 Mod 1. Today's test powders are Hodgdon BL-C(2) and Ramsh...
) Dr. Payne in Hertfordshire contributed a bolt and stock, Alfie in Scotland sent a proper magazine (RIP Alf!) and Grant in Canada sent about s dozen fire-control parts. I made the bolt head from a drawing and some 4400-series stainless. The whole thing came together in about a year and shot like a 100+ year old rifle built by an amateur from cobbled together bits and bobs. But she was gorgeous!
LiveLife
Member
H335 is my primary powder for .223 and I planned on testing H335 for 55/62/69 gr bullets referencing these JRB 55/62 gr videos and using M193/Black Hills/Remington 55 gr FMJ as baseline reference:
.223 Remington FMJ Shootout - Part 3 - H335
55gr FMJ shootout in .223 RemingtonUPDATED 09/27/2018 - All links have been removed to comply with YouTube content policies.www.patreon.com/reloading
www.youtube.com
223 Remington | Hornady 62gr FMJ | H335 Revisited
You're a three-legged horse in the Pinewood Derby...
www.youtube.com
JFrank
Member
I’ve never tried 62 grain bullets. 52 and 69 grain bullets appear to be my go to for HPBT bullets, though the 52 grain Barnes Match Burners are more expensive by a fair bit. If I ever get my SPR done I’ll try some 75 grain RMR bullets too. 55 grain bullets and SW Tactical Rifle make a fine cheap and accurate practice load, though it’s moving slow relatively speaking.
LiveLife
Member
62 gr bullets I have are SS109 used for M855 apparently "inherently" less accurate than other FMJ bullets.
Since RMR released 69/75 gr BTHP bullets, I will be using 55 gr as plinking/range blaster ammo and 69/75 gr for precision loads.
If the 55 grain bullets are only for killing paper and cans, I’d recommend trying Tactical Rifle. SW isn’t kidding when they say 17.5 grains will run a rifle length system with a 55 grain bullet. 400 rounds per pound of powder is pretty appealing for practice loads. I’m sure other powders would work but I’ve not seen any such data published.
LiveLife
Member
Nice and thanks. That's what I was using H335 for until I got some Benchmark or AR Comp with which JRB got smaller groups with (Pretty impressive consistent small groups with AR Comp) but I haven't seen either locally for almost a year.
I keep checking with local gun stores and when I ask when they may get some powders in I like (Like Varget, H4895, AR Comp, etc.), I get the usual blank stare followed by nervous smile.
(They have gotten increasing number of pistol/rifle powders but they are ones I already have or too slow of burn rate for me to use)If/when stars align and online vendors have powders I want at prices I like with free shipping or HazMat, I may have to order online like my previous online order but that was a large group buy which made shipping/HazMat cost negligible when powders were non-existent.
I did pick up some Fiocchi SR primers at $60/1000 locally to add to small quantity of CCI #41 SR primers I already had on hand so light at the end of the tunnel is getting brighter.
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I’ll try the confirmation loads for this powder/bullet combo. If I can get through my 308 tests I’ll move over and maybe try some H335 for these bullets. They shot pretty good with Tactical Rifle too. TAC was tolerable and I feel a better test method could tighten up groups. H335 works pretty well with my cast 30-30 loads too, and only uses 15 grains per round.
I ran off and forgot my markers today but the colors make things much more obvious. I ran a range of 150 grain FMJ in 308. I think I have a good range but it’s not as clear as I’d like. I had to cut it short as I ran into pressure issues before I got to the top of my range.
Also, should I be using smaller increments? I’m running ~1% in my 308, which is 0.4 grains.
JFrank
Member
You want separation but not enough to be skipping over a node or landing in between at .4 .. I like .2 in a 308 sized cartridge but other fellas have luck at .3
Shoot at one point of aim and look at the pause/ overlapping charge impacts.
Here’s my son in Law’s 270 wsm on the same day, he’s disregarding the high and low then selecting the overlapping mid charge.
A couple warm up shots, then 8 for the test and he’s done ‘
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How does the accuracy of the rifle affect the testing? Is it easier to do with a more inherently accurate rifle?
I wasn’t able to repeat the performance of the 69 grain loads using Match Rifle. The group was larger by about 75%. I suppose that is within the realm of possibility. The Hornady load on the page shoots like that pretty regularly but it has had groups up to about 2” as well.
I wasn’t able to repeat the performance of the 69 grain loads using Match Rifle. The group was larger by about 75%. I suppose that is within the realm of possibility. The Hornady load on the page shoots like that pretty regularly but it has had groups up to about 2” as well.
JFrank
Member
Well your rifle just may not like the overall combination of components , especially powder. Should be easy to qualify or eliminate a powder quickly. Try a known combo for that caliber and narrow down powder charge.
So the current plan is a reshoot at 24.7, 24.5, & 24.3 and 24.1. I also want to try Sharpie marking the projectiles, since I forgot today. I’m also going to try 2 shots to see if that tells me enough.
For the 308 FMJ load I double checked the brass and there isn’t actually a mark from my shooting. I may shoot the last three sets for completeness but the groups and consistency today are about what I was after. I’ll have to decide if I want to pull these and build a larger batch or keep going and take my chances with the heavier loads.
For the 308 FMJ load I double checked the brass and there isn’t actually a mark from my shooting. I may shoot the last three sets for completeness but the groups and consistency today are about what I was after. I’ll have to decide if I want to pull these and build a larger batch or keep going and take my chances with the heavier loads.
JFrank
Member
The bullet is the 150 grain Hornady FMJ. Powder is Shooters World AR Plus. I have a decent supply of Winchester LRPs for the time being. I typically use CCI #34 but they’re MIA. I was hoping to reach 2700 fps. Closer examination seems to indicate the ejector marks on these cases were there already, meaning they don’t line up with the extractor marks from my rifle, ie opposite side. These are once fired range brass, but all Federal stamped.
JFrank
Member
I don’t see a problem with Winchester lrp but I would definitely try a different powder.
I run
H4895
Imr 4064
RL-15
Varget
VV N140
I don’t know anyone that runs shooters world AR plus in a 308
I run
H4895
Imr 4064
RL-15
Varget
VV N140
I don’t know anyone that runs shooters world AR plus in a 308
I tried TAC, IMR 4064, and AR Plus. TAC was a little off, IMR 4064 did great but it’s twice the price of AR Plus. AR Plus was the cheapest powder that gave acceptable results. I’d use IMR 4064 for all my rifle loads but it’s rare and expensive when I do find it. Neither is a property I want in an FMJ load. I may have to accept it for the previously mentioned 223 load with 75 grain Hornady bullets and for the 168 grain Speer Match load in 7.62 NATO.
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