hattori.hanzo

You are right, I have nixed up P1/2. 😵‍💫

P1: 12.73 mm / 0.5010 inch

P2: 12.17 mm / 0.4790 inch

4 hours ago, No i deer said:

I think my mates H20 capacity was 57.5.

This doesn’t seem to be correct. This is pretty much the 308 Win capacity.

As per GRT manual, I need to measure H2O at room temperature of fired (not sized) and length trimmed cases.

I will give RS 70 a try with a staring load at pmax -25%. RS 70 is reported to burn much more aggressive than calculated. So I need to be careful.

Ok, looks like a possibility worth trying. Many thanks for your help!
 

Do you have any clue about the high case volume of 68,6 grs H2O out of a straight 284 Win? (See initial posting.)

I already have a load in this range with N160. The 3.5 kg power can is empty and I would like to try a powder with more energy.

Hi everyone,

so far, I have used N160 for my 284 Win with Lapua cases and Lapua 180 grs Scenar-L bullets. Now, I have tried to calculate two loads with new RS 70/76 powders using GRT and previously measured the water capacity of my fired cases. I am surprised by the results:

The slower RS 76 powder is burning faster?

Somehow, nothing really makes sense:

The fired case size don’t fit to CIP specifications. I have measured P1 12.17 mm and P2 12.72 mm for the fired Lapua cases. This is significantly more than what the case should have according to CIP, especially at the shoulder. Also, the case volume with 68.60 grs H2O is significantly larger than what is noted in the GRT database.

Actually, it looks more like a 284 Shehane! Can you draw any conclusions from the data?

Thank you
Uwe

5 hours ago, Elwood said:

You have a older batch of 180 L's, you would be hard pushed to see the difference in meplat between them and Berger 180 Hybrids or VLD with the newer Scenar 180 L's.

I did a test with pointing the older 180 L's, with very pointed, normally pointed and not pointed. I shot them at 1000 yards and there wasn't any difference in the point of impact.

This is awesome news! I bought 1.700 Scenar-L last year. They are not pointed and have pretty ugly tips.

They are not trimmed/pointed at all, but it would be nice if Lapua would do it by default. 🙃

Hi all, 

does somebody use Peterson brass for .248 Win? 

I‘ve measured 0.0160“ neck wall thickness.

Do you know how thick the Lapuas are in this calibre? Just to compare it.

Additional, I experience significant problems with running these used Peterson brass with my Wilson FL die. One brass did stuck in the die.

The only way of success is to use the wider Forster die with a lot of lube.

I get the following numbers for my fired Peterson brass (CIP):

P1: 0.4995“

P2: 0.4780“

H2: 0.3200“

Many thanks

Uwe

I‘ll stay with Lapua since they are available more frequently. As soon as the exchange rate for USD will reach healthy regions again, I might go for a trim and pointing tool to get rid of the inconsistent looking bullet tips of the Scenar-L.

Many thanks to all of you!

Thanks for your reply. Whats do you mean with the Hornady can blow up?

Hi all,

did you test the cal 7mm/.284 Win Hornady 180gr ELD Match bullets over the Lapua 180gr Scenar-L yet?

The Scenar-L shoot well but the ELD-M bullets do have a much higher BC. Also, the Scenar-L bullet overall length vary a lot, because of the bullet tip, which is not unique.

Do you have any comments on my thoughts above?

Many thanks
Uwe

Many thanks for your comment on my question.

The next barrel is going to have 32+ inch. I‘ll stay with N160 somewhere near pmax. N165 will not burn 100% in my barrel mathematically.

Hi all, 

I have a 27,5“ (700 mm) Heym CPQ coated barrel and would like to shoot Lapua 180 gr Scenar-L put of my 7mm/.284 Win. The barrel has 8,7“ (220 mm) of twist.

I am currently using N160 and getting 2769 fps (844 m/s) wirh 52,1 grs. The powder is completely burnt in the barrel.

However, I also read many posts with recommendations for N165.
The powder doesn’t seem to burn completely - purely mathematically - inside my 27,5“ barrel.

What are your experiences with the two powders in shorter barrels?

Best
Uwe