Gents:

Using a 270 grain bullet in a CZ 550 375 H&H, what velocities could reasonably be expected from a 25" barrel?

Would this sort of recipe be a good general NA round?

A270 gr slug @ 2700 fps should drop anything on the American continent(s)

quote:

Would this sort of recipe be a good general NA round?

The 270 TSX is quite effective on whitetail though I did have one run 50 yards this past year. Of course, the blood trail was impressive. I tend to load premium---esp. TSX---bullets for hunting. Erring on the side of better bullets prevents failures and not having enough bullet for the job. But for most game any cup and core will do. 270 grains doesn't leave a lot of room for failure.

quote:

Using a 270 grain bullet in a CZ 550 375 H&H, what velocities could reasonably be expected from a 25" barrel?

Depends a little on the powder and charge, but 2700 to 2800 would be a fair range. Put it 2" high at 100 yards and kill away. I can say from experience that the 25.3" barrel of a CZ can be a little unwieldy in a deer blind.

LWD

so, could I expect lower pressures from a 300 grain bullet at say 2350 fps with a 25" barrel?

The standard .375H&H load has been a 300 grain bullet at 2550 fps. So depending on what powder you are using, yes, that should be lower pressure. Look at the Hodgdon load data. They list pressures for the min and max loads; you may be able to extrapolate from there to estimate pressure. Though I wouldn't be overly concerned with that.

LWD

thanks. more curiosity than anything else. i am expecting my reworked cz back from dennis olson in a week or so and want to begin working up a load for it. i'm keeping the barrel at 25" until I decide I want it shorter, if at all.

I understand that. Mine balances well as is. If i cut it down i'm afraid i'd need to do stock work to restore the balance.

Top velocity with 270 grainers comes from Reloader 15 and especially for long spitzer bullets. 4350 powders are a bit slow and the Varget a bit fast.

Re 15 will get to 2800 in a 25 inch barrel.

Thanks, Mike. I don't have a program available to me, but can someone tell what the drops would be if we use Mike's Reloader 15, a 270 grain bullet in a 25" barrel leaving the muzzle at 2800 fps zeroed at 100 yards and 200 yards?

Thanks!

Here is a photo of a a portion of a Speer 270 gr. BT spitzer shot from a 375 H&H Magnum and recovered from a Zebra shot from about 200 yards. The wound on the Zebra was oblong indicating that the bullet or a fragment thereof hit it sideways. My PH postulated, and I would agree with him, that the bullet must have hit a twig or branch before impacting the Zebra. The PH also said he had never seen a Zebra bleed so much (perhaps he was exagerating) but, in any case, the Zebra didn't go far.

Two hundred seventy grains is a lot of lead so even a portion thereof will be lethal. For anything less than dangerous game, I personally don't see much reason to spend money on premium bullets that won't kill the animal any deader but that's just me.

As for velocities, in cartridges I've chronographed, I've found very good correlation (usually within 75 fps) between powder charges with a given weight of bullet and published velocities. For barrels over about 22 inches, adding or decreasing barrel length probably won't change the velocity more than 15 to 30 fps.

Looks good!

quote:

Originally posted by jsl3170:
Gents:

Using a 270 grain bullet in a CZ 550 375 H&H, what velocities could reasonably be expected from a 25" barrel?

Would this sort of recipe be a good general NA round?

2700 FPS. Same trajectory as the 30/'06 180-grain load. Plenty powerful for any NA game animal!