7mm Rem. Mag. and 240 Wby. Load Development

[track]

I was out 4 times this winter conducting load development for hunting. Yesterday I concluded the development on the following 2 cartridges.
240 Weatherby
85 grian Nosler Partition
54.5 grains of H-4831SC
Norma Brass
210M Primer 1-10 Twist
.010 jump
3,607 fps
I'll probably use the 7mm Rem. Mag. and the 30-06 this year for hunting however, it's typical of me to change my mind, maybe the 270 Win.





7mm Remington Magnum
140 grain Nosler Ballistic Tip
70.5 grains Reloder #26
Peterson Brass
215M
.045 Jump
3,170 fps

 

[Dogleg]

Gotta like it when a plan comes together. With the .240 was your charge weight where you pressured out, or where it shot? Just curious; seating to the lands like that.

 

[DGY]

Nice really nice !

 

[remington jim]

Track - like me you were burning RL26 in your 240 WBee - why you change ?

 

[track]

Gotta like it when a plan comes together. With the .240 was your charge weight where you pressured out, or where it shot? Just curious; seating to the lands like that.

One thing which baffles me is the discrepancies with the reloading manuals. Nosler has a max load of 54 grains of H4831SC whereas, the Hodgdon load data centre is max at 56 grains. Anyway, I always start off with all cartridges with a .020" jump. Once I find the most accurate load from 2 different powders, I then decrease the jump. Usually there is an increase in accuracy.
To answer you're question, I'm always watching the primer, which is the first indication of pressure, followed by ejector marks and stiff bolt lift. The only pressure sign I had was a slight flattening of the primer.

Track - like me you were burning RL26 in your 240 WBee - why you change ?
That's an easy question to answer. First it's the rarity of the powder, second the cost. I substatuted the RL 26 for the 7mm Remington Magnum. There is a person selling 4, one pounders for $300 each, firm. NUTS! Now with H-4831 and the 85 grain Nosler Partition, I lost 70 fps, and down-range energy; oh boo hoo! I most content with the outcome of the 240. Now I'm off to the Calgary Easter Gun Show; I have some money to burn. LOL!

 

[track]

UPDATE:
Yesterday I attended the gun range and confirmed the 7mm Remington Magnum accuracy. It performed a little better than the previous outing, maybe because of the Redding Expander Mandrel. (2815) .002.5 neck tension.

One shooter error on the top left target. POI's are in the exact place, meaning that an eleven shot group made a nice cluster. If I didn't error on the one shot, it would of been a nice cluster of 12. Not bad for a stock hunting rifle.

I never tried any other gun powder, other than VV-165. Accuracy was better than the Alliant #26 however, the velocity was quite lathargic.

My shoulder may be in a sling this autumn carring this rifle however, I have been known to change my mine; I love the 30-06.