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Hi, mag length on my 284 is 3.100. Thinking about loading 150gr eld x. Currently using 140gr sst for OAL of 2.940 seated at cannalure. If I seat the same amount of x bullet in then OAL would be 1.063.
Would this give enough room for mag feed?
Also I could seat deeper without compression as using 760 powder.
Appreciate your thoughts.
Idea would be to assemble some inert dummy rounds to the length you want and try them, alter length to get a correct feed if you have to. Then check the favoured length against your true COAL on your chamber to see how much jump you have.
Yeah, sounds good. Does anyone mind sending me a projectile to dummy up with?
I don't have any but failing any offers maybe a 15 pack from Gunworks?Quote:
Originally Posted by stevodog
Decided to get a full pack...will make them work even if single loading
Settled on 3.000 OAL which is still a way awAy from the lands but mag feeds well
Still does the trick aye. Great caliber.Quote:
Originally Posted by stevodog
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Don’t get too hung up on distance to the lands - if it works at mag length then take yes as answer - definitely worth trying before single loading. One of my rifles is a fraction better seated longer than mag length, but certainly not enough to worry about under field conditions, so mag length it is...
Yeah, that's what I figure as well. I'm not a good enough shot to benefit from tweaking loads too much at any rate.
I've decided to go the 150 eldx for my saum so will be interested in how you go with yours in .284, speed will probably be pretty close.
Yeah, I don't have a chroni but probably be a bit over 2900 and maybe up to 3000. Plan to validate loads in Rotorua next month.
Oh, this sounds nice. What barrel length are you running?Quote:
Originally Posted by stevodog
22inch. Data shows 2968 at 45600cup with 53.5gr of 760. Presumably from a 24inch barrel. If I carefully sneak another grain or do in would see close to 3000 though if something more moderate shoots well then ill leave it
Don't count on 'data' for accurate speeds, just saying :)
Yep, that's a given
50900cup with 53.5gr
Just started load dev for my new 284, 22 in Truflite UM bbl 1:8.5 twist built on Tikka ex 2506. Barrel run in and ran a couple of test ladders.
162 AMAX with RL17, 52.5 to 54.5 gns, pressure still ok. 2995 FPS over the chrony at 18ft from muzzle with 54.5 gun. :thumbsup:
Happy camper, that’s getting close to Rem Mag speeds !
And 160 TMKs with Superformance , up to 2875 FPS and no pressure signs.
So now time to run some groups to find the sweet spot, fingers crossed it’s close to max velocity.
Yeah thats good speed alright, I get 3005 fps with the 162 Amax from my 22" 7mm SAUM, with 67.5gr of 2217. Some guys 7RM's are not even getting that accurately.Quote:
Originally Posted by chainsaw
What is the cost of converting a 708 to a 284? Just curious as could be a good future project.
I have just got a load going in mine that I'm keen to see how it performs on the animals. I am sending the 140gn Berger VLD at 3050. That's with 57gn of 2209. If I do my bit they can go into the same hole. That is the max in the book however there are no real pressure signs, but the case is at 99.5% capacity I reckon.Quote:
Originally Posted by GWH
There is only the cost of a re-chamber which is not to expensive. It can just be a bit of a chore finding brass, or you can make your own.Quote:
Originally Posted by superdiver
And new dies of courseQuote:
Originally Posted by Kudu
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Hmm always got my mind on the next project. Will see what comes up as thought about a 284 as a replacment for my 308 bushpig
If you do it on a t3 708, you can also put the Long action mag and bolt stop in, and run heavy pills seated right out to get max case capacity.Quote:
Originally Posted by superdiver
Out of interest, I finished up on 52gr 760 behind 150gr eld x with magnum primer. Met a slightly sticky bolt at book max 53.5. The projectile seated reasonably deep at 3.000 OAL.
Shooting well and still at around 2850 I guess. Being a control round feed I think single loading long ones is off the cards. Still a notch above a 708 I think.
Controlled round feed will still allow the extractor to cam over the rim of the case
Interesting, I'm at 52.5gr of H414 (same powder) with the 162 Amax. But I'm seated out very long. Custom long throated chamber.Quote:
Originally Posted by stevodog
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Cool, I didn't know that. I would be interested to try some seated out further and going a bit faster
Have you chronied your load GWH? That's right on book max on my data.
I still have some things to work out with mine..it's fun and I'm learning a bit.
.
Yep its right at 2700 fps from an 17 inch barrel. Holds 1000+ ft lbs to 800 odd yards.Quote:
Originally Posted by stevodog
Cool, just keeps going.
Think ill try some single load ones here just to confirm whether my early pressure is from deep seated projectiles. If so then ill probably keep some single load eld x and load a shorter 150gr projectile that I can ramp up and mag feed. Has a dialable scope so can adjust for different POI.
Is that the 162?Quote:
Originally Posted by GWH
ft lbs- impressive.
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yep im still using the old Amax's. Yeah the high bc just keeps hanging on eh, lighter pills start out way faster, but loose speed fast too.Quote:
Originally Posted by Danny
Just ran some load dev yesterday and interesting enough, my sweet spot for accuracy is 52.5-53 h414 with the 162 also. 19 inch bbl, loaded at 3.12 ish.
Didnt chrony but both groups were stacked so im picking sd&es will be good also
Update on this thread. Mag. Loaded some sierra game kings 150gr and loaded some 150gr eld x at 3.13 for single loading. Both ended up at 53gr w760 and shooting well to same POI with no more sticky bolt lift.
Has been a good exercise for me when loading with data not specific to the projectiles I'm using.