backwoodsshooter
Well-Known Member
not gonna lie, that is a sexy rifle.
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30 Sherman Magnum 20” Build
- Thread starter CA48
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not gonna lie, that is a sexy rifle.
Phorwath, I don't think I ever started getting compressed charges even at 88gr. The 215s seated at 3.722" are seated pretty far out there. I'm sure I was getting very close and il double check for you in a few days when I get back. If remember correctly powder was still just below the neck with 88gr. I made a drop tube probably around 16" and that made a big difference.
I have 565 but I've tested it in a lot of 300PRCs and 6.5 PRCs and it gets almost identical velocitys within a .5gr of h-1000 in the 78-79gr charges (milder loads).
If I had some 560 I would try it but I believe it's to fast, closer burn rate to h4831/h4350 I believe.
I'm hoping N568 will give Identical velocitys as 570 but with more ideal case fill in the SAUM sized cartridges.
My guess is RL26 will be within 30-50fps short of 570 at equal pressures.
I have 565 but I've tested it in a lot of 300PRCs and 6.5 PRCs and it gets almost identical velocitys within a .5gr of h-1000 in the 78-79gr charges (milder loads).
If I had some 560 I would try it but I believe it's to fast, closer burn rate to h4831/h4350 I believe.
I'm hoping N568 will give Identical velocitys as 570 but with more ideal case fill in the SAUM sized cartridges.
My guess is RL26 will be within 30-50fps short of 570 at equal pressures.
elkaholic
Well-Known Member
I think youre probably right on all counts.
568 should be a good one in several of my chamberings.
Phorwath, 88gr is compressed. I'm thinking Il end up in the 85gr range though 2900Fps+. 85 looks to be in the 97-100% range with powder level settling right around the shoulder/body junction.
Barrel has 125rounds through it now and brass is formed. Should be around a week or so before I start load development. Right now the barrel has very minimal fouling. Cleans up easily with a brush and a few patches.
Barrel has 125rounds through it now and brass is formed. Should be around a week or so before I start load development. Right now the barrel has very minimal fouling. Cleans up easily with a brush and a few patches.
Went out today and did another pressure test with n570. When I started the barrel had 125rds through it.
75*
CBTO 3.956" +.005"
215 Berger
N570
Fed215M
NT .001"
ADG brass
83.7 2880
84 2870
84.3 2880
84.6 2893
84.9 2895
85.2 2942
85.5 2963
85.8 2949
When conditions are better Il shoot the ladder at 700-800 yards. Never saw any pressure signs with 1x brass.
I loaded up a single case with 85.5gr and shot it 8 times. By the end the base measured .532.5" after sizing. It could have gone for more firing but I was tired of messing with it at this point. The first firing was with 83gr jammed to form it. By the 3rd firing I was getting clickers and 1 or 2 of those later firings had faint ej marks. With 85.5 I could shake the case and hear powder moving. Load density is ~95%. I would call 85.5 max working pressure for this stainless Rem 700 receiver.
75*
CBTO 3.956" +.005"
215 Berger
N570
Fed215M
NT .001"
ADG brass
83.7 2880
84 2870
84.3 2880
84.6 2893
84.9 2895
85.2 2942
85.5 2963
85.8 2949
When conditions are better Il shoot the ladder at 700-800 yards. Never saw any pressure signs with 1x brass.
I loaded up a single case with 85.5gr and shot it 8 times. By the end the base measured .532.5" after sizing. It could have gone for more firing but I was tired of messing with it at this point. The first firing was with 83gr jammed to form it. By the 3rd firing I was getting clickers and 1 or 2 of those later firings had faint ej marks. With 85.5 I could shake the case and hear powder moving. Load density is ~95%. I would call 85.5 max working pressure for this stainless Rem 700 receiver.
So if I'm reading this correctly, after 3-4 firings you had clickers for the last 4-5 firings? And ejector marks started showing around 6th firing? Just trying to get my head around this. That's some pretty great velocity from that short a barrel.
elkaholic
Well-Known Member
When did you buy the dies?
I'm going to test it again. Not a good run as I forgot to trim that piece of brass. So it was causing some issues.
Rich, I think I bought dies this last Oct or Nov.
slikmrc
Well-Known Member
What barrel twist and groove are you running? Glad to see I'm not the only one still using the Bob Hagel style of measuring cases for pressure.
snox801
Well-Known Member
Looking forward to you trying the 214 hammer.
I have a 26" proof on mine and am gonna be launching the 214 or 199's out of mine.
I have a 26" proof on mine and am gonna be launching the 214 or 199's out of mine.
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elkaholic
Well-Known Member
those dies we're borderline sizing enough so clickers were more likely. I had Hornady tighten them up another .0005" and they are perfect
Running an 8 Twist.
I ran one case again, for 10 firings this time, but it could have gone more.
I didn't explain it very well last time but I was seeing increasing pressure with the same charge due to the piece of brass growing as I never trimmed it throughout out the process last time.
This time this I cleaned the barrel. Shot 1 factory Hornady round through it to help foul the barrel. I then grabbed a piece of adg that had been formed with a mild load and started. So 10 firings total counting the mild FF load. 1 at 83gr of N570 then 9 with 85.5gr.
No Pressure signs until the 4th firing then I started to get clickers and very faint ej marks that you really had to look for and could only find in the sunlight. With each shot I was lining up a letter on the case head with the ejector so I knew where to look. After the 6th firing I started pushing the shoulder back more. Then shots 7-10 the clickers went away but I was still getting the very faint ej shadows that you really had to look for in the sun to see.
As far as me pushing the shoulders back more and the clickers going away. Part of my thinking is when I took my initial shoulder measurements for my bump it was on a once fired case that was not fully formed yet in addition to the Hornady comparator which is not going to be perfect or in the exact right spot on the shoulder for a precise measurement. But the clickers did indeed go away once I started pushing shoulders back .001" more. I know this shouldn't have much to do with the base of the case not getting sized enough which is where clickers usually come from if I understand correctly, just relaying what I experienced.
After the case had been fired 10x i sized it again and measured the base with Mitutoyo calipers. It measured .5326"
The 10X fired case
The 9 velocity readings in order with 85.5gr of 570 at +.005" with the 215s after the barrel had been fouled with one shot. After looking at these readings it looks like I would have had a much lower ES if I had put a few more shots through the barrel before I started taking readings. It seemed to stabilize after the 3rd shot from clean bore.
1 Hornady factory
2 2966
3 2922
4 2956
5 2951
6 2946
7 2958
8 2956
9 2948
10 2955
Good to know. So I'm good for a trade in right
