Printable View
.So today while waiting for Gib stopping to dry for sanding I went to my shed and loaded up a ladder for my single shot .308 with ADI 2208 and Nosler Ballistic tips 150gr Stared at the ADI book min of 44g and went up in 0.5gr increments to 46gr which is one grain under ADI's max load for this powder. Hoping to get to the range next week to test. Seated to SAAMI specs with CCI LR primers.
Attachment 233627
Attaboy :cool:
How did the ladder test go, & what rifle did you get?
Hoping to get to the range this week, its for a Rossi single shot with DPT canQuote:
Originally Posted by flock
Attachment 234640
You could go a bit higher if needed. I run 45.5gn 2208 with 168g NBTs and this is not showing any pressure signs in my REM700 308. If you wanted to push it further probably go up in 0.3gn steps.
Interesting morning at the range. My lowest load at 44gr had the best group at 1", my highest load at 46gr had joint worst with 44.5gr. All at 100yards off a bipod with rear bag on a bench, range is slightly up hill from bench to targets.
Did you chrono it ? Do you care about velocity for your intended use ?
If you don't care and 1" is good enough then job done :thumbsup:
If you do care and want to use it at extended ranges I would do a seating depth ladder with your most consistent velocity load, but without the velocity data it's a bit of a guess as to try and advise where to start tweaking things.
But hey as per first comment if the 44gn load will do what ya need.....have at it :cool:
lightish single shot off bipod jumps out at me. I KNOW both the bakails and the older BLRs are very position sensitive with the forestock...why we used to hold magazine n action rather than wood shooting paper with BLR.... must try both sling swivel points with trebly and see which one works best ...I would suggest trying again over a fat sleeping bag with hand nesteled in holding stock firmly and also with hand just infront of trigger guard both times asserting rearward pressure. also did you have something soft under legs of bipod??
looking at forestock attachment design.....it appear the bipod is more of less going to be asserting direct pressure on barrel. different pressure = different POI.... maybe.
Nice wee rifle Hj,1 inch group will kill deer,go hunting.
The front swivel stud fixes into a stub on the barrel for breaking down so bipod bracket sits slightly behind that. Forestock is solid timber no flex at all.
Did not chronogaph this time as didn't have it here, might just settle on 44gr will think on it. Yes did have soft stuff under bipod legs.
good stuff...but yes even so the barrel is in direct contact via stud to forestock,to bipod,so to ground.. no free float as such.... agree 1" is good enough all day long for what you will want 99.99% of the time.
Do yourself a favor before you load a whole heap, just load another 3-6 rounds at your 44gn load and confirm same poi and good enough grouping.
As Micky is kinda alluding to some rifles are very positioning sensitive when it comes to pressures being exerted on forestock, yours could be very prone to this due to the sling swivel being directly attached to the barrel.
Bipod by the nature of how they work and fit to the rifle will put pressure on the fore depending on if you load it up (lean into it) not a big deal but find what works for you and do that :cool:
Just loaded 5 to test when next can get out. Will see but so far I'm looking good and if I can get a hunt in first before the range all well and good.
what size were the worst groups and how many shots for each ?Quote:
Originally Posted by Happy Jack
It's been years since I loaded .308 so I'm rattling some old braincells.
2208 is not a very efficient powder in the cartridge (but obviously if that's all you have, then use it!) but it's also generally one of the most forgiving powders in terms of performance and temperature so I'm surprised
Please, what is your "ladder test" method?
I always understood it to be one shot at each charge weight, shot over a chrony at 200+ meters, while watching for vertical so I'm not sure how you can have a "group" at one weight
I did 3 shots at each weight for accuracy rather than speed as didn't have access to a chrony at this point. Accuracy for me is the most important point, speed is secondary.
Greetings @11mms,
You are quite right. The ladder test is single shots of increasing charge weights fired at long range in calm conditions. The loads were not chronographed. The test was to determine sets of loads that were closer together than others due to a calm spot in the barrel vibration. Unfortunately "Ladder Test" has been applied to endless series of 3 shot groups with increasing powder charge at close range which tell the shooter little to nothing about the long range precision of the load. If you fire the same string again you can get completely different results.
Greetings @Happy Jack,
You seem to have reached a decent load which is not hard to do with the .308. I found while AR2208 shot well in my .308 rifles it was sometimes hard to get decent velocity before I ran out of space. These days I use AR2206H. Feel free to PM me if you want some of my chronographed .308 data.
Regards Grandpamac.
PS. I chronographed 44 grains of AR2208 in my 20 inch barrelled.308 using Winchester cases and 150 grain Hornady projectiles. It gave 2,560 fps. You may find that load shoots best in the Rossi with its break open action. I load 41 grains of AR2206H, a nice comfortable load in a suppressed rifle.
GPM.
Not sure where this 2208 being inefficient comes from.
The old rough rule of thumb for the 308W used to be up to 150gr use 2206H, greater than 150gr use 2208. The short barrel vogue may change that somewhat.
I shoot 180gr and 200gr (Berger 200.20x) in my 308W using 2208 very well. In fact, if you look at Hodgdon's loading data, they don't even list 2206H loads for these weights.
All were 3 shot groups worst was 2.75 inches.Quote:
Originally Posted by rossi.45
Thanks for the offer Grandpa Mac will see how we go, using 2208 as its what I have and I don't have money to keep burning so if something works for me I tend to keep using it.
